Merge remote-tracking branch 'rtt/master'

README.md

@@ -1,8 +1,9 @@
-# AT device #
+# AT device #
 
 ## 1. 简介 ##
 
-AT device 软件包是由 RT-Thread AT 组件针对不同 AT 设备的移植文件和示例代码组成，目前支持的 AT 设备有：ESP8266、M26、MC20、RW007、MW31、SIM800C 以及 SIM76XX 系列设备等，目前上述设备都完成对 `AT socket` 功能的移植，及设备通过 AT 命令实现标准 socket 编程接口，完成 socket 通讯的功能，具体功能介绍可参考 [《RT-Thread 编程指南》](https://www.rt-thread.org/document/site/programming-manual/at/at/)AT 命令章节 。 
+
+AT device 软件包是由 RT-Thread AT 组件针对不同 AT 设备的移植文件和示例代码组成，目前支持的 AT 设备有：ESP8266、ESP32、M26、MC20、RW007、MW31、SIM800C、W60X 、SIM76XX、A9/A9G、BC26 、AIR720、ME3616、M6315、BC28、EC200X系列设备等，目前上述设备都完成对 `AT socket` 功能的移植，及设备通过 AT 命令实现标准 socket 编程接口，完成 socket 通讯的功能，具体功能介绍可参考 [《RT-Thread 编程指南》](https://www.rt-thread.org/document/site/programming-manual/at/at/)AT 命令章节 。 
 
 ### 1.1. 目录结构 ###
 
@@ -13,12 +14,21 @@ AT device 软件包是由 RT-Thread AT 组件针对不同 AT 设备的移植文
 | sample | 不同设备示例文件目录 |
 | class | 不同设备针对 AT 组件的移植适配目录 |
 | class/esp8266 | ESP8266 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/esp32   | ESP32 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
 | class/rw007 | RW007 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
 | class/sim800c | SIM800C 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
 | class/sim76xx | SIM76XX 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
 | class/m26 | M26/MC20 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
 | class/ec20 | EC20 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
 | class/mw31 | MW31 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/w60x | W60X 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/a9g | A9G 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/bc26 | bc26 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/air720 | air720 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/me3616 | me3616 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/m6315 | m6315 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/bc28 | bc28 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
+| class/ec200x | EC200T、EC200S 设备针对 AT 组件的移植目录，实现 AT Socket 功能 |
 ### 1.2 许可证 ###
 
 at_device package 遵循 LGPLv2.1 许可，详见 `LICENSE` 文件。
@@ -43,7 +53,8 @@ AT device 软件包目前已经发布多个版本，各个版本之间选项配
 - **V1.4.0**：适用于 RT-Thread 版本小于 V3.1.3或等于 V4.0.0， AT 组件版本等于 V1.2.0；
 - **V1.5.0**：适用于 RT-Thread 版本小于 V3.1.3 或等于 V4.0.0， AT 组件版本等于 V1.2.0；
 - **V1.6.0**：适用于 RT-Thread 版本等于 V3.1.3 或等于 V4.0.1， AT 组件版本等于 V1.2.0；
-- **laster**：只适用于 RT-Thread 版本大于 V4.0.1 或者大于 3.1.3， AT 组件版本大于 V1.2.0；
+- **V2.0.0/V2.0.1**：适用于 RT-Thread 版本大于 V4.0.1 或者大于 3.1.3， AT 组件版本等于 V1.3.0；
+- **laster**：只适用于 RT-Thread 版本大于 V4.0.1 或者大于 3.1.3， AT 组件版本等于 V1.3.0；
 
 >  上述 版本判断在 menuconfig 中自动完成，at_device 软件包选择版本时会根据当前系统环境给出最佳版本支持，这里版本介绍作为运行环境参考。
 
@@ -61,7 +72,7 @@ AT device 软件包目前已经发布多个版本，各个版本之间选项配
                   Version (V1.6.0)  --->
 
 - **Enable at device init by thread**: 配置开启设备网络初始化是否通过创建线程完成；
-- **AT socket device modules**: AT 设备选择，目前支持 RW007、ESP8266、M26/MC20、EC20、SIM800C、SIM76XX  等设备；
+- **AT socket device modules**: AT 设备选择，目前支持 RW007、ESP8266、M26/MC20、EC20、SIM800C、SIM76XX、A9/A9G、BC26 、air720、ME3616、M6315、BC28、EC200X等设备；
 - **Version**: 下载软件包版本；
 
 **V2.X.X (laster) 版本配置选项介绍**
@@ -80,6 +91,7 @@ RT-Thread online packages  --->
           (uart3) AT client device name
           (512)   The maximum length of receive line buffer
         [ ]   Quectel EC20  --->
+        [ ]   Espressif ESP32  --->
         [*]   Espressif ESP8266  --->
           [*]   Enable initialize by thread
           [*]   Enable sample
@@ -91,6 +103,14 @@ RT-Thread online packages  --->
         [ ]   SIMCom SIM800C  --->
         [ ]   SIMCom SIM76XX  --->
         [ ]   Notion MW31  --->
+        [ ]   WinnerMicro W60X  --->
+        [ ]   AiThink A9/A9G  --->
+        [ ]   Quectel BC26  --->
+        [ ]   Luat air720  --->
+        [ ]   GOSUNCN ME3616  --->
+        [ ]   ChinaMobile M6315  --->
+        [ ]   Quectel BC28  --->
+        [ ]   Quectel ec200x  --->
         Version (latest)  --->
 ```
 
@@ -109,10 +129,19 @@ RT-Thread online packages  --->
   - **WIFI password**：配置该示例设备连接的 WIFI 密码；
   - **AT client device name**：配置该示例设备使用的串口设备名称；
   - **The maximum length of receive line buffer**：配置该示例设备最大一行接收的数据长度；
+- **Espressif ESP32**：开启 ESP32 （WIFI 模块）设备支持；
 - **Realthread RW007**：开启 RW007 （WIFI 模块）设备支持；
 - **SIMCom SIM800C**：开启 SIM800C （2G 模块）设备支持；
 - **SIMCom SIM76XX**：开启 SIM76XX （4G 模块）设备支持； 
 - **Notion MW31**：开启 MW31 （WIFI 模块）设备支持； 
+- **WinnerMicro W60X**：开启 W60X （WIFI 模块）设备支持；
+- **AiThink A9/A9G**：开启 A9/A9G （2G 模块）设备支持；
+- **Quectel BC26**：开启 BC26（NB-IOT 模块）设备支持；
+- **Luat Air720**：开启 air720（4g 模块）设备支持；
+- **GOSUNCN ME3616**：开启 ME3616（NB-IOT 模块）设备支持；
+- **ChinaMobile M6315**：开启 M6315 （2G 模块）设备支持；
+- **Quectel BC28**：开启 BC28（NB-IoT 模块）设备支持；
+- **Quectel EC200X**：开启 EC200T、EC200S（4G 模块）设备支持；
 - **Version** 下载软件包版本；
 
 上面配置选项以 2G 模块和 WIFI 模块选项为例，介绍了`V2.X.X` 版本 AT device 软件包配置方式，如下几点值得注意：
@@ -153,6 +182,11 @@ RT-Thread Components  --->
 - `laster` 版本支持多个选中多个 AT 设备接入实现 AT Socket 功能，`V1.X.X` 版本只支持单个 AT 设备接入。
 - AT device 软件包目前多个版本主要用于适配 AT 组件和系统的改动，推荐使用最新版本  RT-Thread 系统，并在 menuconfig 选项中选择 `latest` 版本；
 
+## 4. 相关文档
+
+- [AT 组件编程指南](https://www.rt-thread.org/document/site/programming-manual/at/at/)
+- [应用 AT 组件连接 ESP8266 模块](https://www.rt-thread.org/document/site/application-note/components/at/an0014-at-client/)
+
 ## 5. 联系方式
 
 * 维护：RT-Thread 开发团队及社区开发者

SConscript

@@ -4,6 +4,15 @@ cwd = GetCurrentDir()
 path = [cwd + '/inc']
 src  = Glob('src/*.c')
 
+# A9G
+if GetDepend(['AT_DEVICE_USING_A9G']):
+    path += [cwd + '/class/a9g']
+    src += Glob('class/a9g/at_device_a9g.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/a9g/at_socket_a9g.c')
+    if GetDepend(['AT_DEVICE_A9G_SAMPLE']):
+        src += Glob('samples/at_sample_a9g.c')
+
 # M26/MC20
 if GetDepend(['AT_DEVICE_USING_M26']):
     path += [cwd + '/class/m26']
@@ -31,6 +40,15 @@ if GetDepend(['AT_DEVICE_USING_ESP8266']):
     if GetDepend(['AT_DEVICE_ESP8266_SAMPLE']):
         src += Glob('samples/at_sample_esp8266.c')
 
+# ESP32
+if GetDepend(['AT_DEVICE_USING_ESP32']):
+    path += [cwd + '/class/esp32']
+    src += Glob('class/esp32/at_device_esp32.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/esp32/at_socket_esp32.c')
+    if GetDepend(['AT_DEVICE_ESP32_SAMPLE']):
+        src += Glob('samples/at_sample_esp32.c')
+
 # MW31
 if GetDepend(['AT_DEVICE_USING_MW31']):
     path += [cwd + '/class/mw31']
@@ -67,6 +85,69 @@ if GetDepend(['AT_DEVICE_USING_SIM76XX']):
     if GetDepend(['AT_DEVICE_SIM76XX_SAMPLE']):
         src += Glob('samples/at_sample_sim76xx.c')
 
+# W60X
+if GetDepend(['AT_DEVICE_USING_W60X']):
+    path += [cwd + '/class/w60x']
+    src += Glob('class/w60x/at_device_w60x.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/w60x/at_socket_w60x.c')
+    if GetDepend(['AT_DEVICE_W60X_SAMPLE']):
+        src += Glob('samples/at_sample_w60x.c')
+        
+# BC26
+if GetDepend(['AT_DEVICE_USING_BC26']):
+    path += [cwd + '/class/bc26']
+    src += Glob('class/bc26/at_device_bc26.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/bc26/at_socket_bc26.c')
+    if GetDepend(['AT_DEVICE_BC26_SAMPLE']):
+        src += Glob('samples/at_sample_bc26.c')
+        
+# air720
+if GetDepend(['AT_DEVICE_USING_AIR720']):
+    path += [cwd + '/class/air720']
+    src += Glob('class/air720/at_device_air720.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/air720/at_socket_air720.c')
+    if GetDepend(['AT_DEVICE_AIR720_SAMPLE']):
+        src += Glob('samples/at_sample_air720.c')
+        
+# ME3616
+if GetDepend(['AT_DEVICE_USING_ME3616']):
+    path += [cwd + '/class/me3616']
+    src += Glob('class/me3616/at_device_me3616.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/me3616/at_socket_me3616.c')
+    if GetDepend(['AT_DEVICE_ME3616_SAMPLE']):
+        src += Glob('samples/at_sample_me3616.c')
+
+# M6315
+if GetDepend(['AT_DEVICE_USING_M6315']):
+    path += [cwd + '/class/m6315']
+    src += Glob('class/m6315/at_device_m6315.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/m6315/at_socket_m6315.c')
+    if GetDepend(['AT_DEVICE_M6315_SAMPLE']):
+        src += Glob('samples/at_sample_m6315.c')            
+
+# BC28
+if GetDepend(['AT_DEVICE_USING_BC28']):
+    path += [cwd + '/class/bc28']
+    src += Glob('class/bc28/at_device_bc28.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/bc28/at_socket_bc28.c')
+    if GetDepend(['AT_DEVICE_BC28_SAMPLE']):
+        src += Glob('samples/at_sample_bc28.c')
+
+# EC200X
+if GetDepend(['AT_DEVICE_USING_EC200X']):
+    path += [cwd + '/class/ec200x']
+    src += Glob('class/ec200x/at_device_ec200x.c')
+    if GetDepend(['AT_USING_SOCKET']):
+        src += Glob('class/ec200x/at_socket_ec200x.c')
+    if GetDepend(['AT_DEVICE_EC200X_SAMPLE']):
+        src += Glob('samples/at_sample_ec200x.c')
+        
 group = DefineGroup('at_device', src, depend = ['PKG_USING_AT_DEVICE'], CPPPATH = path)
 
 Return('group')

class/a9g/at_device_a9g.c

@@ -0,0 +1,923 @@
+/*
+ * File      : at_socket_a9g.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-11-23     luliang    first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <at_device_a9g.h>
+
+#define LOG_TAG                    "at.dev.a9g"
+#include <at_log.h>
+ 
+#ifdef AT_DEVICE_USING_A9G
+
+#define A9G_WAIT_CONNECT_TIME      5000
+#define A9G_THREAD_STACK_SIZE      2048
+#define A9G_THREAD_PRIORITY        (RT_THREAD_PRIORITY_MAX/2)
+
+/* AT+CSTT command default*/
+static char *CSTT_CHINA_MOBILE  = "AT+CSTT=\"CMNET\"";
+static char *CSTT_CHINA_UNICOM  = "AT+CSTT=\"UNINET\"";
+static char *CSTT_CHINA_TELECOM = "AT+CSTT=\"CTNET\"";
+
+static void a9g_power_on(struct at_device *device)
+{
+    struct at_device_a9g *a9g = RT_NULL;
+
+    a9g = (struct at_device_a9g *) device->user_data;
+
+    /* not nead to set pin configuration for m26 device power on */
+    if (a9g->power_pin == -1 || a9g->power_status_pin == -1)
+    {
+        return;
+    }
+
+    if (rt_pin_read(a9g->power_status_pin) == PIN_HIGH)
+    {
+        return;
+    }
+    rt_pin_write(a9g->power_pin, PIN_HIGH);
+
+    while (rt_pin_read(a9g->power_status_pin) == PIN_LOW)
+    {
+        rt_thread_mdelay(10);
+    }
+    rt_pin_write(a9g->power_pin, PIN_LOW);
+}
+
+static void a9g_power_off(struct at_device *device)
+{
+    struct at_device_a9g *a9g = RT_NULL;
+
+    a9g = (struct at_device_a9g *) device->user_data;
+
+    /* not nead to set pin configuration for m26 device power on */
+    if (a9g->power_pin == -1 || a9g->power_status_pin == -1)
+    {
+        return;
+    }
+
+    if (rt_pin_read(a9g->power_status_pin) == PIN_LOW)
+    {
+        return;
+    }
+    rt_pin_write(a9g->power_pin, PIN_HIGH);
+
+    while (rt_pin_read(a9g->power_status_pin) == PIN_HIGH)
+    {
+        rt_thread_mdelay(10);
+    }
+    rt_pin_write(a9g->power_pin, PIN_LOW);
+}
+
+
+/* =============================  a9g network interface operations ============================= */
+
+/* set a9g network interface device status and address information */
+static int a9g_netdev_set_info(struct netdev *netdev)
+{
+#define A9G_IEMI_RESP_SIZE      32
+#define A9G_IPADDR_RESP_SIZE    32
+#define A9G_DNS_RESP_SIZE       96
+#define A9G_INFO_RESP_TIMO      rt_tick_from_millisecond(300)
+
+    int result = RT_EOK;
+    ip_addr_t addr;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+	
+    RT_ASSERT(netdev);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    /* set network interface device status */
+    netdev_low_level_set_status(netdev, RT_TRUE);
+    netdev_low_level_set_link_status(netdev, RT_TRUE);
+    netdev_low_level_set_dhcp_status(netdev, RT_TRUE);
+
+    resp = at_create_resp(A9G_IEMI_RESP_SIZE, 0, A9G_INFO_RESP_TIMO);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* set network interface device hardware address(IEMI) */
+    {
+        #define A9G_NETDEV_HWADDR_LEN   8
+        #define A9G_IEMI_LEN            15
+
+        char iemi[A9G_IEMI_LEN] = {0};
+        int i = 0, j = 0;
+
+        /* send "AT+GSN" commond to get device IEMI */
+        if (at_obj_exec_cmd(device->client, resp, "AT+GSN") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_parse_line_args(resp, 2, "%s", iemi) <= 0)
+        {
+            LOG_E("a9g device(%s) prase \"AT+GSN\" commands resposne data error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("a9g device(%s) IEMI number: %s", device->name, iemi);
+
+        netdev->hwaddr_len = A9G_NETDEV_HWADDR_LEN;
+        /* get hardware address by IEMI */
+        for (i = 0, j = 0; i < A9G_NETDEV_HWADDR_LEN && j < A9G_IEMI_LEN; i++, j += 2)
+        {
+            if (j != A9G_IEMI_LEN - 1)
+            {
+                netdev->hwaddr[i] = (iemi[j] - '0') * 10 + (iemi[j + 1] - '0');
+            }
+            else
+            {
+                netdev->hwaddr[i] = (iemi[j] - '0');
+            }
+        }
+    }
+
+    /* set network interface device IP address */
+    {
+        #define IP_ADDR_SIZE_MAX    16
+        char ipaddr[IP_ADDR_SIZE_MAX] = {0};
+
+        at_resp_set_info(resp, A9G_IPADDR_RESP_SIZE, 2, A9G_INFO_RESP_TIMO);
+		
+        /* send "AT+CIFSR" commond to get IP address */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CIFSR") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_parse_line_args_by_kw(resp, ".", "%s", ipaddr) <= 0)
+        {
+            LOG_E("a9g device(%s) prase \"AT+CIFSR\" commands resposne data error!", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("a9g device(%s) IP address: %s", device->name, ipaddr);
+
+        /* set network interface address information */
+        inet_aton(ipaddr, &addr);
+        netdev_low_level_set_ipaddr(netdev, &addr);
+    }
+
+    /* set network interface device dns server */
+    {
+        #define DNS_ADDR_SIZE_MAX   16
+        char dns_server1[DNS_ADDR_SIZE_MAX] = {0}, dns_server2[DNS_ADDR_SIZE_MAX] = {0};
+
+        at_resp_set_info(resp, A9G_DNS_RESP_SIZE, 0, A9G_INFO_RESP_TIMO);
+
+        /* send "AT+CDNSCFG?" commond to get DNS servers address */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CDNSCFG?") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_parse_line_args_by_kw(resp, "PrimaryDns:", "PrimaryDns:%s", dns_server1) <= 0 ||
+            at_resp_parse_line_args_by_kw(resp, "SecondaryDns:", "SecondaryDns:%s", dns_server2) <= 0)
+        {
+            LOG_E("Prase \"AT+CDNSCFG?\" commands resposne data error!");
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("a9g device(%s) primary DNS server address: %s", device->name, dns_server1);
+        LOG_D("a9g device(%s) secondary DNS server address: %s", device->name, dns_server2);
+
+        inet_aton(dns_server1, &addr);
+        netdev_low_level_set_dns_server(netdev, 0, &addr);
+
+        inet_aton(dns_server2, &addr);
+        netdev_low_level_set_dns_server(netdev, 1, &addr);
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+    
+    return result;
+}
+
+static void check_link_status_entry(void *parameter)
+{
+#define A9G_LINK_STATUS_OK   1
+#define A9G_LINK_RESP_SIZE   128
+#define A9G_LINK_RESP_TIMO   (3 * RT_TICK_PER_SECOND)
+#define A9G_LINK_DELAY_TIME  (30 * RT_TICK_PER_SECOND)
+
+    at_response_t resp = RT_NULL;
+    int result_code, link_status;
+    struct at_device *device = RT_NULL;
+    struct netdev *netdev = (struct netdev *)parameter;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return;
+    }
+
+    resp = at_create_resp(A9G_LINK_RESP_SIZE, 0, A9G_LINK_RESP_TIMO);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for response create.");
+        return;
+    }
+
+    while (1)
+    {
+        /* send "AT+CREG?" commond  to check netweork interface device link status */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CREG?") < 0)
+        {
+            rt_thread_mdelay(A9G_LINK_DELAY_TIME);
+            continue;
+        }
+        link_status = -1;
+        at_resp_parse_line_args_by_kw(resp, "+CREG:", "+CREG: %d,%d", &result_code, &link_status);
+
+        /* check the network interface device link status  */
+        if ((A9G_LINK_STATUS_OK == link_status) != netdev_is_link_up(netdev))
+        {
+            netdev_low_level_set_link_status(netdev, (A9G_LINK_STATUS_OK == link_status));
+        }
+        rt_thread_mdelay(A9G_LINK_DELAY_TIME);
+    }
+}
+
+static int a9g_netdev_check_link_status(struct netdev *netdev)
+{
+#define a9g_LINK_THREAD_TICK           20
+#define a9g_LINK_THREAD_STACK_SIZE     512
+#define a9g_LINK_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX - 2)
+
+    rt_thread_t tid;
+    char tname[RT_NAME_MAX] = {0};
+
+    if (netdev == RT_NULL)
+    {
+        LOG_E("input network interface device is NULL.\n");
+        return -RT_ERROR;
+    }
+
+    rt_snprintf(tname, RT_NAME_MAX, "%s_link", netdev->name);
+
+    tid = rt_thread_create(tname, check_link_status_entry, (void *) netdev, 
+            a9g_LINK_THREAD_STACK_SIZE, a9g_LINK_THREAD_PRIORITY, a9g_LINK_THREAD_TICK);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+
+    return RT_EOK;
+}
+
+static int a9g_net_init(struct at_device *device);
+
+static int a9g_netdev_set_up(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get a9g device by netdev name(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_FALSE)
+    {
+        a9g_net_init(device);
+        device->is_init = RT_TRUE;
+        
+        netdev_low_level_set_status(netdev, RT_TRUE);
+        LOG_D("the network interface device(%s) set up status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int a9g_netdev_set_down(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get a9g device by netdev name(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_TRUE)
+    {
+        a9g_power_off(device);
+        device->is_init = RT_FALSE;
+
+        netdev_low_level_set_status(netdev, RT_FALSE);
+        LOG_D("the network interface device(%s) set down status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int a9g_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server)
+{
+#define a9g_DNS_RESP_LEN     8
+#define a9g_DNS_RESP_TIMEO   rt_tick_from_millisecond(300)
+
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(dns_server);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get a9g device by netdev name(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(a9g_DNS_RESP_LEN, 0, a9g_DNS_RESP_TIMEO);
+    if (resp == RT_NULL)
+    {
+        LOG_D("a9g set dns server failed, no memory for response object.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* send "AT+CDNSCFG=<pri_dns>[,<sec_dns>]" commond to set dns servers */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CDNSCFG=\"%s\"", inet_ntoa(*dns_server)) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    netdev_low_level_set_dns_server(netdev, dns_num, dns_server);
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int a9g_ping_domain_resolve(struct at_device *device, const char *name, char ip[16])
+{
+    int result = RT_EOK;
+    char recv_ip[16] = { 0 };
+    at_response_t resp = RT_NULL;
+
+    /* The maximum response time is 14 seconds, affected by network status */
+    resp = at_create_resp(512, 4, 14 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) response structure.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+CGACT=1,1") < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+CDNSGIP=\"%s\"", name) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+	
+    if (at_resp_parse_line_args_by_kw(resp, "+CDNSGIP:", "%*[^,],%*[^,],\"%[^\"]", recv_ip) < 0)
+    {
+        rt_thread_mdelay(100);
+        /* resolve failed, maybe receive an URC CRLF */
+    }
+
+    if (rt_strlen(recv_ip) < 8)
+    {
+        rt_thread_mdelay(100);
+        /* resolve failed, maybe receive an URC CRLF */
+    }
+    else
+    {
+        rt_strncpy(ip, recv_ip, 15);
+        ip[15] = '\0';
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+#ifdef NETDEV_USING_PING
+#ifdef AT_DEVICE_USING_A9G
+static int a9g_netdev_ping(struct netdev *netdev, const char *host, 
+        size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp)
+{
+    rt_kprintf("I don't have PING function!\r\n");
+    return RT_EOK;
+}
+#endif
+#endif /* NETDEV_USING_PING */
+
+#ifdef NETDEV_USING_NETSTAT
+void a9g_netdev_netstat(struct netdev *netdev)
+{ 
+    // TODO netstat support
+}
+#endif /* NETDEV_USING_NETSTAT */
+
+const struct netdev_ops a9g_netdev_ops =
+{
+    a9g_netdev_set_up,
+    a9g_netdev_set_down,
+
+    RT_NULL, /* not support set ip, netmask, gatway address */
+    a9g_netdev_set_dns_server,
+    RT_NULL, /* not support set DHCP status */
+
+#ifdef NETDEV_USING_PING
+    a9g_netdev_ping,
+#endif
+#ifdef NETDEV_USING_NETSTAT
+    a9g_netdev_netstat,
+#endif
+};
+
+static struct netdev *a9g_netdev_add(const char *netdev_name)
+{
+#define A9G_NETDEV_MTU       1500
+    struct netdev *netdev = RT_NULL;
+
+    RT_ASSERT(netdev_name);
+
+    netdev = (struct netdev *) rt_calloc(1, sizeof(struct netdev));
+    if (netdev == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) netdev structure.", netdev_name);
+        return RT_NULL;
+    }
+
+    netdev->mtu = A9G_NETDEV_MTU;
+    netdev->ops = &a9g_netdev_ops;
+
+#ifdef SAL_USING_AT
+    extern int sal_at_netdev_set_pf_info(struct netdev *netdev);
+    /* set the network interface socket/netdb operations */
+    sal_at_netdev_set_pf_info(netdev);
+#endif
+
+    netdev_register(netdev, netdev_name, RT_NULL);
+
+    return netdev;
+}
+
+/* =============================  a9g device operations ============================= */
+
+#define AT_SEND_CMD(client, resp, resp_line, timeout, cmd)                                         \
+    do {                                                                                           \
+        (resp) = at_resp_set_info((resp), 128, (resp_line), rt_tick_from_millisecond(timeout));    \
+        if (at_obj_exec_cmd((client), (resp), (cmd)) < 0)                                          \
+        {                                                                                          \
+            result = -RT_ERROR;                                                                    \
+            goto __exit;                                                                           \
+        }                                                                                          \
+    } while(0)                                                                                     \
+
+/* init for a9g */
+static void a9g_init_thread_entry(void *parameter)
+{
+#define INIT_RETRY                     5
+#define CPIN_RETRY                     10
+#define CSQ_RETRY                      10
+#define CREG_RETRY                     10
+#define CGREG_RETRY                    20
+
+    int i, qimux, retry_num = INIT_RETRY;
+    char parsed_data[10] = {0};
+    rt_err_t result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = (struct at_device *)parameter;
+    struct at_client *client = device->client;
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) response structure.", device->name);
+        return;
+    }
+
+    LOG_D("start initializing the device(%s)", device->name);
+
+    while (retry_num--)
+    {
+        rt_memset(parsed_data, 0, sizeof(parsed_data));
+        rt_thread_mdelay(500);
+        a9g_power_on(device);
+        rt_thread_mdelay(1000);
+
+        /* wait a9g startup finish */
+        if (at_client_obj_wait_connect(client, A9G_WAIT_CONNECT_TIME))
+        {
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+
+        /* disable echo */
+        AT_SEND_CMD(client, resp, 0, 300, "ATE0");
+        /* get module version */
+        AT_SEND_CMD(client, resp, 5, 300, "ATI");
+        /* show module version */
+        for (i = 0; i < (int)resp->line_counts - 1; i++)
+        {
+            LOG_D("%s", at_resp_get_line(resp, i + 1));
+        }
+        /* check SIM card */
+        for (i = 0; i < CPIN_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 2, 10 * 1000, "AT+CCID");
+            if (at_resp_get_line_by_kw(resp, "+CCID:"))
+            {
+                LOG_D("a9g device(%s) SIM card detection success.", device->name);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == CPIN_RETRY)
+        {
+            LOG_E("a9g device(%s) SIM card detection failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+		
+		/* make the device restart */
+        AT_SEND_CMD(client, resp, 0, 300, "AT+RST=1");
+        for(i = 0; i<=30; i++)
+        {
+            i++;
+            rt_thread_mdelay(1000);
+        }
+		
+        /* waiting for dirty data to be digested */
+        rt_thread_mdelay(1000);
+
+        /* check the GSM network is registered */
+        for (i = 0; i < CREG_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, "AT+CREG?");
+            at_resp_parse_line_args_by_kw(resp, "+CREG:", "+CREG: %s", &parsed_data);
+            if (!strncmp(parsed_data, "1,1", sizeof(parsed_data)) ||
+                !strncmp(parsed_data, "1,5", sizeof(parsed_data)))
+            {
+                LOG_D("a9g device(%s) GSM network is registered(%s),", device->name, parsed_data);
+                break;
+            }
+            rt_thread_mdelay(1000 + 500 * (i+1));
+        }
+        if (i == CREG_RETRY)
+        {
+            LOG_E("a9g device(%s) GSM network is register failed(%s).", device->name, parsed_data);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* the device default response timeout is 40 seconds, but it set to 15 seconds is convenient to use. */
+        for (uint8_t ii = 0; ii < INIT_RETRY; ii++)
+        {
+            resp = at_resp_set_info(resp, 128, 0, rt_tick_from_millisecond(10 * 1000));
+            if (at_obj_exec_cmd(client, resp, "AT+CGATT=0") == RT_EOK)
+            {
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        
+        /* check the GPRS network is registered */
+        for (i = 0; i < CGREG_RETRY; i++)
+        {
+            for (uint8_t ii = 0; ii < INIT_RETRY; ii++)
+            {
+                //AT_SEND_CMD(client, resp, 0, 5 * 1000, "AT+CGATT=1");
+                resp = at_resp_set_info(resp, 128, 0, rt_tick_from_millisecond(10 * 1000));
+                if (at_obj_exec_cmd(client, resp, "AT+CGATT=1") == RT_EOK)
+                {
+                    break;
+                }
+                rt_thread_mdelay(1000);
+            }
+			
+            AT_SEND_CMD(client, resp, 0, 1000, "AT+CGDCONT=1,\"IP\",\"CMNET\"");
+            rt_thread_mdelay(10);
+            AT_SEND_CMD(client, resp, 0, 5 * 1000, "AT+CGACT=1,1");
+            rt_thread_mdelay(10);
+            at_resp_parse_line_args_by_kw(resp, "OK", "%s", &parsed_data);
+            
+			if (!strncmp(parsed_data, "OK", sizeof(parsed_data)))
+            {
+                LOG_D("a9g device(%s) GPRS network is registered(%s).", device->name, parsed_data);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == CGREG_RETRY)
+        {
+            LOG_E("a9g device(%s) GPRS network is register failed(%s).", device->name, parsed_data);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* check signal strength */
+        for (i = 0; i < CSQ_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, "AT+CSQ");
+            at_resp_parse_line_args_by_kw(resp, "+CSQ:", "+CSQ: %s", &parsed_data);
+            if (strncmp(parsed_data, "99,99", sizeof(parsed_data)))
+            {
+                LOG_D("a9g device(%s) signal strength: %s", device->name, parsed_data);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == CSQ_RETRY)
+        {
+            LOG_E("a9g device(%s) signal strength check failed (%s)", device->name, parsed_data);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* Set to multiple connections */
+        AT_SEND_CMD(client, resp, 0, 300, "AT+CIPMUX?");
+
+        at_resp_parse_line_args_by_kw(resp, "+CIPMUX:", "+CIPMUX:%d", &qimux);
+
+        if (qimux == 0)
+        {
+            AT_SEND_CMD(client, resp, 0, 1 * 1000, "AT+CIPMUX=1");
+        }
+
+        AT_SEND_CMD(client, resp, 0, 300, "AT+COPS?");
+        at_resp_parse_line_args_by_kw(resp, "+COPS:", "+COPS: %*[^\"]\"%[^\"]", &parsed_data);
+        if (rt_strcmp(parsed_data, "CHINA MOBILE") == 0)
+        {
+            /* "CMCC" */
+            LOG_I("a9g device(%s) network operator: %s", device->name, parsed_data);
+            AT_SEND_CMD(client, resp, 0, 300, CSTT_CHINA_MOBILE);
+        }
+        else if (rt_strcmp(parsed_data, "CHN-UNICOM") == 0)
+        {
+            /* "UNICOM" */
+            LOG_I("a9g device(%s) network operator: %s", device->name, parsed_data);
+            AT_SEND_CMD(client, resp, 0, 300, CSTT_CHINA_UNICOM);
+        }
+        else if (rt_strcmp(parsed_data, "CHN-CT") == 0)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, CSTT_CHINA_TELECOM);
+            /* "CT" */
+            LOG_I("a9g device(%s) network operator: %s", device->name, parsed_data);
+        }
+
+        AT_SEND_CMD(client, resp, 2, 300, "AT+CIFSR");
+        if (at_resp_get_line_by_kw(resp, "ERROR") != RT_NULL)
+        {
+            LOG_E("a9g device(%s) get the local address failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+#ifdef	AT_USING_A9G_GPS
+        AT_SEND_CMD(client, resp, 0, 300, "AT+GPS?");
+        at_resp_parse_line_args_by_kw(resp, "+GPS:", "+GPS: %d", &qimux);
+        if (qimux == 0)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, "AT+GPS=1");
+        }
+#endif
+        result = RT_EOK;
+
+__exit:
+        if (result == RT_EOK)
+        {
+            break;
+        }
+        else
+        {
+            /* power off the a9g device */
+            a9g_power_off(device);
+            rt_thread_mdelay(1000);
+
+            LOG_I("a9g device(%s) initialize retry...", device->name);
+        }
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (result == RT_EOK)
+    {
+        device->is_init = RT_TRUE;
+        
+        /* set network interface device status and address information */
+        a9g_netdev_set_info(device->netdev);
+        /*  */
+        a9g_netdev_check_link_status(device->netdev);
+        /*  */
+        LOG_I("a9g device(%s) network initialize success!", device->name);
+
+    }
+    else
+    {
+        device->is_init = RT_FALSE;
+        
+        netdev_low_level_set_status(device->netdev, RT_FALSE);
+        LOG_E("a9g device(%s) network initialize failed(%d)!", device->name, result);
+    }
+}
+
+static int a9g_net_init(struct at_device *device)
+{
+#ifdef AT_DEVICE_A9G_INIT_ASYN
+    rt_thread_t tid;
+
+    tid = rt_thread_create("a9g_net_init", a9g_init_thread_entry, (void *)device,
+                A9G_THREAD_STACK_SIZE, A9G_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("create a9g device(%s) initialization thread failed.", device->name);
+        return -RT_ERROR;
+    }
+#else
+    a9g_init_thread_entry(device);
+#endif /* AT_DEVICE_a9g_INIT_ASYN */
+
+    return RT_EOK;
+}
+
+static void urc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data);
+
+    LOG_I("URC data : %.*s", size, data);
+}
+
+/* a9g device URC table for the device control */
+static const struct at_urc urc_table[] = 
+{
+        {"READY",         "\r\n",                 urc_func},
+};
+
+static int a9g_init(struct at_device *device)
+{
+    struct at_device_a9g *a9g = (struct at_device_a9g *) device->user_data;
+
+    /* initialize AT client */
+    at_client_init(a9g->client_name, a9g->recv_line_num);
+
+    device->client = at_client_get(a9g->client_name);
+    if (device->client == RT_NULL)
+    {
+        LOG_E("a9g device(%s) initialize failed, get AT client(%s) failed.", a9g->device_name, a9g->client_name);
+        return -RT_ERROR;
+    }
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+#ifdef AT_USING_SOCKET
+    a9g_socket_init(device);
+#endif
+
+    /* add a9g device to the netdev list */
+    device->netdev = a9g_netdev_add(a9g->device_name);
+    if (device->netdev == RT_NULL)
+    {
+        LOG_E("a9g device(%s) initialize failed, get network interface device failed.", a9g->device_name);
+        return -RT_ERROR;
+    }
+	
+	/* initialize a9g pin configuration */
+    if (a9g->power_pin != -1 && a9g->power_status_pin != -1)
+    {
+        rt_pin_mode(a9g->power_pin, PIN_MODE_OUTPUT);
+        rt_pin_mode(a9g->power_status_pin, PIN_MODE_INPUT);
+    }
+
+    /* initialize a9g device network */
+    return a9g_netdev_set_up(device->netdev);
+}
+
+static int a9g_deinit(struct at_device *device)
+{
+    return a9g_netdev_set_down(device->netdev);
+}
+
+static int a9g_control(struct at_device *device, int cmd, void *arg)
+{
+    int result = -RT_ERROR;
+
+    RT_ASSERT(device);
+
+    switch (cmd)
+    {
+    case AT_DEVICE_CTRL_POWER_ON:
+    case AT_DEVICE_CTRL_POWER_OFF:
+    case AT_DEVICE_CTRL_RESET:
+    case AT_DEVICE_CTRL_LOW_POWER:
+    case AT_DEVICE_CTRL_SLEEP:
+    case AT_DEVICE_CTRL_WAKEUP:
+    case AT_DEVICE_CTRL_NET_CONN:
+    case AT_DEVICE_CTRL_NET_DISCONN:
+    case AT_DEVICE_CTRL_SET_WIFI_INFO:
+    case AT_DEVICE_CTRL_GET_SIGNAL:
+    case AT_DEVICE_CTRL_GET_GPS:
+    case AT_DEVICE_CTRL_GET_VER:
+        LOG_W("a9g not support the control command(%d).", cmd);
+        break;
+    default:
+        LOG_E("input error control command(%d).", cmd);
+        break;
+    }
+
+    return result;
+}
+
+const struct at_device_ops a9g_device_ops = 
+{
+    a9g_init,
+    a9g_deinit,
+    a9g_control,
+};
+
+static int a9g_device_class_register(void)
+{
+    struct at_device_class *class = RT_NULL;
+
+    class = (struct at_device_class *) rt_calloc(1, sizeof(struct at_device_class));
+    if (class == RT_NULL)
+    {
+        LOG_E("no memory for a9g device class create.");
+        return -RT_ENOMEM;
+    }
+
+    /* fill a9g device class object */
+#ifdef AT_USING_SOCKET
+    a9g_socket_class_register(class);
+#endif
+    class->device_ops = &a9g_device_ops;
+
+    return at_device_class_register(class, AT_DEVICE_CLASS_A9G);
+}
+INIT_DEVICE_EXPORT(a9g_device_class_register);
+
+#endif /* AT_DEVICE_USING_a9g */

class/a9g/at_device_a9g.h

@@ -0,0 +1,67 @@
+/*
+ * File      : at_device_a9g.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-11-23     luliang    first version
+ */
+ 
+#ifndef __A9G_DEVICE_H__
+#define __A9G_DEVICE_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the a9g device */
+#define AT_DEVICE_A9G_SOCKETS_NUM		8
+
+struct at_device_a9g
+{
+	char *device_name;
+	char *client_name;
+	
+	int power_pin;
+	int power_status_pin;
+	size_t recv_line_num;
+	struct at_device device;
+	
+	void *user_data;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* a9g device socket initialize */
+int a9g_socket_init(struct at_device *device);
+
+/* a9g device class socket register */
+int a9g_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif	/*	__AT_DEVICE_A9G_H__*/

class/a9g/at_socket_a9g.c

@@ -0,0 +1,623 @@
+/*
+ * File      : at_socket_a9g.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-11-23     luliang    first version
+ */
+ 
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_a9g.h>
+
+#define LOG_TAG                        "at.skt.a9g"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_A9G) && defined(AT_USING_SOCKET)
+
+#define A9G_MODULE_SEND_MAX_SIZE   1000
+
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event)       (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define A9G_EVENT_CONN_OK          (1L << 0)
+#define A9G_EVENT_SEND_OK          (1L << 1)
+#define A9G_EVENT_RECV_OK          (1L << 2)
+#define A9G_EVENT_CLOSE_OK         (1L << 3)
+#define A9G_EVENT_CONN_FAIL        (1L << 4)
+#define A9G_EVENT_SEND_FAIL        (1L << 5)
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static int a9g_socket_event_send(struct at_device *device, uint32_t event)
+{
+    return (int) rt_event_send(device->socket_event, event);
+}
+
+static int a9g_socket_event_recv(struct at_device *device, uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = RT_EOK;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(device->socket_event, event, option | RT_EVENT_FLAG_CLEAR, timeout, &recved);
+    if (result != RT_EOK)
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    return recved;
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int a9g_socket_close(struct at_socket *socket)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(600));
+    
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) response creat.", device->name);
+        return -RT_ENOMEM;
+    }
+    
+    if (at_obj_exec_cmd(device->client, resp, "AT+CIPCLOSE=%d", device_socket) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+    
+    return result;
+}
+
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int a9g_socket_connect(struct at_socket *socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
+{
+    uint32_t event = 0;
+    rt_bool_t retryed = RT_FALSE;
+    at_response_t resp = RT_NULL;
+    int result = RT_EOK, event_result = 0;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    resp = at_create_resp(128, 0, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) response structure.", device->name);
+        return -RT_ENOMEM;
+    }
+
+__retry:
+
+    /* clear socket connect event */
+    event = SET_EVENT(device_socket, A9G_EVENT_CONN_OK | A9G_EVENT_CONN_FAIL);
+    a9g_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    if (is_client)
+    {
+        switch (type)
+        {
+        case AT_SOCKET_TCP:
+            /* send AT commands(eg: AT+QIOPEN=0,"TCP","x.x.x.x", 1234) to connect TCP server */
+            if (at_obj_exec_cmd(device->client, RT_NULL, "AT+CIPSTART=\"TCP\",\"%s\",%d", ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        case AT_SOCKET_UDP:
+            if (at_obj_exec_cmd(device->client, RT_NULL, "AT+CIPSTART=\"UDP\",\"%s\",%d", ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        default:
+            LOG_E("a9g device(%s) not supported connect type : %d.", device->name, type);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+			}
+
+    /* waiting result event from AT URC, the device default connection timeout is 75 seconds, but it set to 10 seconds is convenient to use */
+    if (a9g_socket_event_recv(device, SET_EVENT(device_socket, 0), 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+    {
+        LOG_E("a9g device(%s) socket(%d) connect failed, wait connect result timeout.",device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* waiting OK or failed result */
+    event_result = a9g_socket_event_recv(device, 
+            A9G_EVENT_CONN_OK | A9G_EVENT_CONN_FAIL, 1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+    if (event_result < 0)
+    {
+        LOG_E("a9g device(%s) socket(%d) connect failed, wait connect OK|FAIL timeout.", device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* check result */
+    if (event_result & A9G_EVENT_CONN_FAIL)
+    {
+        if (retryed == RT_FALSE)
+        {
+            LOG_D("a9g device(%s) socket(%d) connect failed, maybe the socket was not be closed at the last time and now will retry.", 
+                    device->name, device_socket);
+            if (a9g_socket_close(socket) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            retryed = RT_TRUE;
+            goto __retry;
+        }
+        LOG_E("a9g device(%s) socket(%d) connect failed.", device->name, device_socket);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+    
+    return result;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int a9g_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    int result = RT_EOK;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+
+    resp = at_create_resp(128, 2, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) response structure.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* set AT client end sign to deal with '>' sign.*/
+    at_obj_set_end_sign(device->client, '>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < A9G_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = A9G_MODULE_SEND_MAX_SIZE;
+        }
+		
+        /* send the "AT+CIPSEND" commands to AT server than receive the '>' response on the first line. */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CIPSEND=%d,%d", device_socket, cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+		
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+		
+		/* waiting OK or failed result */
+        at_resp_set_info(resp, 128, 0, 30 * RT_TICK_PER_SECOND);
+        if (at_obj_exec_cmd(device->client, resp, "") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        at_resp_set_info(resp, 128, 2, 5 * RT_TICK_PER_SECOND);
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data conflict */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int a9g_domain_resolve(const char *name, char ip[16])
+{
+#define RESOLVE_RETRY                  5
+
+    int i, result = RT_EOK;
+    char recv_ip[16] = { 0 };
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first initialization a9g device failed.");
+        return -RT_ERROR;
+    }
+
+    /* The maximum response time is 14 seconds, affected by network status */
+    resp = at_create_resp(1024, 3, 14 * RT_TICK_PER_SECOND);
+
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) response structure.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    for (i = 0; i < RESOLVE_RETRY; i++)
+    {
+        int err_code = 0;
+
+        if (at_obj_exec_cmd(device->client, resp, "AT+CDNSGIP=\"%s\"", name) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* domain name prase error options */
+        if (at_resp_parse_line_args_by_kw(resp, "+CDNSGIP:", "+CDNSGIP: 0,%d", &err_code) > 0)
+        {
+            /* 3 - network error, 8 - dns common error */
+            if (err_code == 3 || err_code == 8)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+        }
+				
+        /* parse the third line of response data, get the IP address */
+				if (at_resp_parse_line_args_by_kw(resp, "+CDNSGIP:", "%*[^,],%*[^,],\"%[^\"]", recv_ip) < 0)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+
+        if (rt_strlen(recv_ip) < 8)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+        else
+        {
+            rt_thread_mdelay(10);
+            rt_strncpy(ip, recv_ip, 15);
+            ip[15] = '\0';
+            break;
+        }
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+		
+    return result;
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void a9g_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static void urc_connect_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get a9g device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (strstr(data, "CONNECT OK"))
+    {
+        a9g_socket_event_send(device, SET_EVENT(device_socket, A9G_EVENT_CONN_OK));
+    }
+    else if (strstr(data, "CONNECT FAIL"))
+    {
+        a9g_socket_event_send(device, SET_EVENT(device_socket, A9G_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_send_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get a9g device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (rt_strstr(data, "SEND OK"))
+    {
+        a9g_socket_event_send(device, SET_EVENT(device_socket, A9G_EVENT_SEND_OK));
+    }
+    else if (rt_strstr(data, "SEND FAIL"))
+    {
+        a9g_socket_event_send(device, SET_EVENT(device_socket, A9G_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get a9g device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (rt_strstr(data, "CLOSE OK"))
+    {
+        a9g_socket_event_send(device, SET_EVENT(device_socket, A9G_EVENT_CLOSE_OK));
+    }
+    else if (rt_strstr(data, "CLOSED"))
+    {
+        struct at_socket *socket = RT_NULL;
+
+        /* get AT socket object by device socket descriptor */
+        socket = &(device->sockets[device_socket]);
+
+        /* notice the socket is disconnect by remote */
+        if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+        {
+            at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, RT_NULL, 0);
+        }
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout;
+    rt_size_t temp_size = 0;
+    char temp[8] = {0};
+    rt_size_t bfsz = 0;
+    char *recv_buf = RT_NULL;
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    /* get the current socket and receive buffer size by receive data */
+    sscanf(data, "+CIPRCV,%d,%d:", &device_socket, (int *) &bfsz);
+    /* get receive timeout by receive buffer length */
+    timeout = bfsz;
+
+    if (device_socket < 0 || bfsz == 0)
+    {
+        return;
+    }
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get a9g device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory for a9g device(%s) URC receive buffer (%d).", device->name, bfsz);
+        temp_size = (size-(rt_strstr(data,":")+1-data)-2);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    temp_size = (size-(rt_strstr(data,":")+1-data)-2);
+    rt_memcpy(recv_buf,rt_strstr(data,":")+1,temp_size);
+    if (at_client_obj_recv(client, recv_buf+temp_size, bfsz-temp_size, timeout) != (bfsz-temp_size))
+    {
+        LOG_E("a9g device(%s) receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get AT socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+/* A9G device URC table for the socket data */
+static const struct at_urc urc_table[] = 
+{
+    {"",            "CONNECT OK\r\n",      urc_connect_func},
+    {"",            ",CONNECT FAIL\r\n",   urc_connect_func},
+    {"",            ",SEND FAIL\r\n",      urc_send_func},
+    {"CLOSED:",     "\r\n",                urc_close_func},
+    {"+CIPRCV,",    "\r\n",                urc_recv_func},
+};
+
+static const struct at_socket_ops a9g_socket_ops = 
+{
+    a9g_socket_connect,
+    a9g_socket_close,
+    a9g_socket_send,
+    a9g_domain_resolve,
+    a9g_socket_set_event_cb,
+};
+
+int a9g_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int a9g_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_A9G_SOCKETS_NUM;
+    class->socket_ops = &a9g_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_A9G && AT_USING_SOCKET */

class/air720/at_device_air720.h

@@ -0,0 +1,66 @@
+/*
+ * File      : at_device_air720.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-16     chenyong     first version
+ */
+
+#ifndef __AT_DEVICE_AIR720_H__
+#define __AT_DEVICE_AIR720_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the air720 device */
+#define AT_DEVICE_AIR720_SOCKETS_NUM      6  
+
+struct at_device_air720
+{     
+    char *device_name;
+    char *client_name;
+
+    int power_pin;
+    int power_status_pin;
+    size_t recv_line_num;
+    struct at_device device;
+
+    void *user_data;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* air720 device socket initialize */
+int air720_socket_init(struct at_device *device);
+
+/* air720 device class socket register */
+int air720_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_AIR720_H__ */

class/air720/at_socket_air720.c

@@ -0,0 +1,648 @@
+/*
+ * File      : at_socket_air720.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-06-12     malongwei    first version
+ * 2019-05-13     chenyong     multi AT socket client support
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <at_device_air720.h>
+
+
+#if !defined(AT_SW_VERSION_NUM) || AT_SW_VERSION_NUM < 0x10300
+#error "This AT Client version is older, please check and update latest AT Client!"
+#endif
+
+#define LOG_TAG "at.skt"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_AIR720) && defined(AT_USING_SOCKET)
+
+#define AIR720_MODULE_SEND_MAX_SIZE 1000
+
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event) (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define AIR720_EVENT_CONN_OK (1L << 0)
+#define AIR720_EVENT_SEND_OK (1L << 1)
+#define AIR720_EVENT_RECV_OK (1L << 2)
+#define AIR720_EVNET_CLOSE_OK (1L << 3)
+#define AIR720_EVENT_CONN_FAIL (1L << 4)
+#define AIR720_EVENT_SEND_FAIL (1L << 5)
+
+static at_evt_cb_t at_evt_cb_set[] = {
+    [AT_SOCKET_EVT_RECV] = NULL,
+    [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static int air720_socket_event_send(struct at_device *device, uint32_t event)
+{
+    return (int)rt_event_send(device->socket_event, event);
+}
+
+static int air720_socket_event_recv(struct at_device *device, uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = RT_EOK;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(device->socket_event, event, option | RT_EVENT_FLAG_CLEAR, timeout, &recved);
+    if (result != RT_EOK)
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    return recved;
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int air720_socket_close(struct at_socket *socket)
+{
+    uint32_t event = 0;
+    int result = RT_EOK;
+    int device_socket = (int)socket->user_data;
+    struct at_device *device = (struct at_device *)socket->device;
+
+    /* clear socket close event */
+    event = SET_EVENT(device_socket, AIR720_EVNET_CLOSE_OK);
+    air720_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    if (at_obj_exec_cmd(device->client, NULL, "AT+CIPCLOSE=%d", device_socket) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (air720_socket_event_recv(device, event, rt_tick_from_millisecond(300 * 3), RT_EVENT_FLAG_AND) < 0)
+    {
+        LOG_E("air720 device(%s) socket(%d) close failed, wait close OK timeout.", device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+
+__exit:
+    return result;
+}
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int air720_socket_connect(struct at_socket *socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
+{
+    uint32_t event = 0;
+    rt_bool_t retryed = RT_FALSE;
+    at_response_t resp = RT_NULL;
+    int result = RT_EOK, event_result = 0;
+    int device_socket = (int)socket->user_data;
+    struct at_device *device = (struct at_device *)socket->device;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+    
+    resp = at_create_resp(128, 0, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for air720 device(%s) response structure.", device->name);
+        return -RT_ENOMEM;
+    }
+
+__retry:
+
+    /* clear socket connect event */
+    event = SET_EVENT(device_socket, AIR720_EVENT_CONN_OK | AIR720_EVENT_CONN_FAIL);
+    air720_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    if (is_client)
+    {
+        switch (type)
+        {
+        case AT_SOCKET_TCP:
+            /* send AT commands(eg: AT+QIOPEN=0,"TCP","x.x.x.x", 1234) to connect TCP server */
+            if (at_obj_exec_cmd(device->client, RT_NULL,
+                                "AT+CIPSTART=%d,\"TCP\",\"%s\",%d", device_socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        case AT_SOCKET_UDP:
+            if (at_obj_exec_cmd(device->client, RT_NULL,
+                                "AT+CIPSTART=%d,\"UDP\",\"%s\",%d", device_socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        default:
+            LOG_E("air720 device(%s) not supported connect type : %d.", device->name, type);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+    }
+
+    /* waiting result event from AT URC, the device default connection timeout is 75 seconds, but it set to 10 seconds is convenient to use */
+    if (air720_socket_event_recv(device, SET_EVENT(device_socket, 0), 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+    {
+        LOG_E("air720 device(%s) socket(%d) connect failed, wait connect result timeout.", device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* waiting OK or failed result */
+    event_result = air720_socket_event_recv(device,
+                                            AIR720_EVENT_CONN_OK | AIR720_EVENT_CONN_FAIL, 1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+    if (event_result < 0)
+    {
+        LOG_E("air720 device(%s) socket(%d) connect failed, wait connect OK|FAIL timeout.", device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* check result */
+    if (event_result & AIR720_EVENT_CONN_FAIL)
+    {
+        if (retryed == RT_FALSE)
+        {
+            LOG_D("air720 device(%s) socket(%d) connect failed, maybe the socket was not be closed at the last time and now will retry.",
+                  device->name, device_socket);
+            if (air720_socket_close(socket) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            retryed = RT_TRUE;
+            goto __retry;
+        }
+        LOG_E("air720 device(%s) socket(%d) connect failed.", device->name, device_socket);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (result != RT_EOK)
+    {
+        
+    }
+
+    return result;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int air720_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    uint32_t event = 0;
+    int result = RT_EOK, event_result = 0;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int)socket->user_data;
+    struct at_device *device = (struct at_device *)socket->device;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+
+    resp = at_create_resp(128, 2, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for air720 device(%s) response structure.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* clear socket connect event */
+    event = SET_EVENT(device_socket, AIR720_EVENT_SEND_OK | AIR720_EVENT_SEND_FAIL);
+    air720_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    /* set AT client end sign to deal with '>' sign.*/
+    at_obj_set_end_sign(device->client, '>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < AIR720_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = AIR720_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+QISEND" commands to AT server than receive the '>' response on the first line. */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CIPSEND=%d,%d", device_socket, cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* send the real data to server or client */
+        result = (int)at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* waiting result event from AT URC */
+        if (air720_socket_event_recv(device, SET_EVENT(device_socket, 0), 15 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            LOG_E("air720 device(%s) socket(%d) send failed, wait connect result timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* waiting OK or failed result */
+        event_result = air720_socket_event_recv(device,
+                                                AIR720_EVENT_SEND_OK | AIR720_EVENT_SEND_FAIL, 5 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("air720 device(%s) socket(%d) send failed, wait connect OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* check result */
+        if (event_result & AIR720_EVENT_SEND_FAIL)
+        {
+            LOG_E("air720 device(%s) socket(%d) send failed.", device->name, device_socket);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data conflict */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int air720_domain_resolve(const char *name, char ip[16])
+{
+#define RESOLVE_RETRY 5
+
+    int i, result = RT_EOK;
+    char recv_ip[16] = {0};
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first initialization air720 device failed.");
+        return -RT_ERROR;
+    }
+
+    /* The maximum response time is 14 seconds, affected by network status */
+    resp = at_create_resp(128, 4, 14 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for air720 device(%s) response structure.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    for (i = 0; i < RESOLVE_RETRY; i++)
+    {
+        int err_code = 0;
+
+        if (at_obj_exec_cmd(device->client, resp, "AT+CDNSGIP=\"%s\"", name) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* domain name prase error options */
+        if (at_resp_parse_line_args_by_kw(resp, "+CDNSGIP: 0", "+CDNSGIP: 0,%d", &err_code) > 0)
+        {
+            /* 3 - network error, 8 - dns common error */
+            if (err_code == 3 || err_code == 8)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+        }
+
+        /* parse the third line of response data, get the IP address */
+        if (at_resp_parse_line_args_by_kw(resp, "+CDNSGIP:", "%*[^,],%*[^,],\"%[^\"]", recv_ip) < 0)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+
+        if (rt_strlen(recv_ip) < 8)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+        else
+        {
+            rt_thread_mdelay(10);
+            rt_strncpy(ip, recv_ip, 15);
+            ip[15] = '\0';
+            break;
+        }
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void air720_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static void urc_connect_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get air720 device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (strstr(data, "CONNECT OK"))
+    {
+        air720_socket_event_send(device, SET_EVENT(device_socket, AIR720_EVENT_CONN_OK));
+    }
+    else if (strstr(data, "CONNECT FAIL"))
+    {
+        air720_socket_event_send(device, SET_EVENT(device_socket, AIR720_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_send_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get air720 device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (rt_strstr(data, "SEND OK"))
+    {
+        air720_socket_event_send(device, SET_EVENT(device_socket, AIR720_EVENT_SEND_OK));
+    }
+    else if (rt_strstr(data, "SEND FAIL"))
+    {
+        air720_socket_event_send(device, SET_EVENT(device_socket, AIR720_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get air720 device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (rt_strstr(data, "CLOSE OK"))
+    {
+        air720_socket_event_send(device, SET_EVENT(device_socket, AIR720_EVNET_CLOSE_OK));
+    }
+    else if (rt_strstr(data, "CLOSED"))
+    {
+        struct at_socket *socket = RT_NULL;
+
+        /* get AT socket object by device socket descriptor */
+        socket = &(device->sockets[device_socket]);
+
+        /* notice the socket is disconnect by remote */
+        if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+        {
+            at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, RT_NULL, 0);
+        }
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    /* get the current socket and receive buffer size by receive data */
+    sscanf(data, "+RECEIVE,%d,%d:", &device_socket, (int *)&bfsz);
+    /* get receive timeout by receive buffer length */
+    timeout = bfsz;
+
+    if (device_socket < 0 || bfsz == 0)
+    {
+        return;
+    }
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get air720 device by client name(%s) failed.", client_name);
+        return;
+    }
+
+    recv_buf = (char *)rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory for air720 device(%s) URC receive buffer (%d).", device->name, bfsz);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("air720 device(%s) receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get AT socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+/* air720 device URC table for the socket data */
+static const struct at_urc urc_table[] =
+    {
+        {"", ", CONNECT OK\r\n", urc_connect_func},
+        {"", ", CONNECT FAIL\r\n", urc_connect_func},
+        {"", ", SEND OK\r\n", urc_send_func},
+        {"", ", SEND FAIL\r\n", urc_send_func},
+        {"", ", CLOSE OK\r\n", urc_close_func},
+        {"", ", CLOSED\r\n", urc_close_func},
+        {"+RECEIVE,", "\r\n", urc_recv_func},
+};
+
+static const struct at_socket_ops air720_socket_ops =
+    {
+        air720_socket_connect,
+        air720_socket_close,
+        air720_socket_send,
+        air720_domain_resolve, 
+        air720_socket_set_event_cb,
+};
+
+int air720_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int air720_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_AIR720_SOCKETS_NUM;
+    class->socket_ops = &air720_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_air720 && AT_USING_SOCKET */

class/bc26/at_device_bc26.h

@@ -0,0 +1,71 @@
+/*
+ * File      : at_device_bc26.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-12-13     qiyongzhong     first version
+ */
+
+#ifndef __AT_DEVICE_BC26_H__
+#define __AT_DEVICE_BC26_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the bc26 device */
+#define AT_DEVICE_BC26_SOCKETS_NUM  5
+
+struct at_device_bc26
+{
+    char *device_name;
+    char *client_name;
+
+    int power_pin;
+    int power_status_pin;
+    size_t recv_line_num;
+    struct at_device device;
+
+    void *socket_data;
+    void *user_data;
+    
+    rt_bool_t power_status;
+    rt_bool_t sleep_status;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* bc26 device socket initialize */
+int bc26_socket_init(struct at_device *device);
+
+/* bc26 device class socket register */
+int bc26_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_BC26_H__ */
+

class/bc26/at_socket_bc26.c

@@ -0,0 +1,790 @@
+/*
+ * File      : at_socket_bc26.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-12-10     qiyongzhong  first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_bc26.h>
+
+#define LOG_TAG                        "at.skt.bc26"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_BC26) && defined(AT_USING_SOCKET)
+
+#define BC26_MODULE_SEND_MAX_SIZE       1024
+
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event)       (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define BC26_EVENT_CONN_OK             (1L << 0)
+#define BC26_EVENT_SEND_OK             (1L << 1)
+#define BC26_EVENT_RECV_OK             (1L << 2)
+#define BC26_EVNET_CLOSE_OK            (1L << 3)
+#define BC26_EVENT_CONN_FAIL           (1L << 4)
+#define BC26_EVENT_SEND_FAIL           (1L << 5)
+#define BC26_EVENT_DOMAIN_OK           (1L << 6)
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static void at_tcp_ip_errcode_parse(int result)//TCP/IP_QIGETERROR
+{
+    switch(result)
+    {
+    case 0   : LOG_D("%d : Operation successful",         result); break;
+    case 550 : LOG_E("%d : Unknown error",                result); break;
+    case 551 : LOG_E("%d : Operation blocked",            result); break;
+    case 552 : LOG_E("%d : Invalid parameters",           result); break;
+    case 553 : LOG_E("%d : Memory not enough",            result); break;
+    case 554 : LOG_E("%d : Create socket failed",         result); break;
+    case 555 : LOG_E("%d : Operation not supported",      result); break;
+    case 556 : LOG_E("%d : Socket bind failed",           result); break;
+    case 557 : LOG_E("%d : Socket listen failed",         result); break;
+    case 558 : LOG_E("%d : Socket write failed",          result); break;
+    case 559 : LOG_E("%d : Socket read failed",           result); break;
+    case 560 : LOG_E("%d : Socket accept failed",         result); break;
+    case 561 : LOG_E("%d : Open PDP context failed",      result); break;
+    case 562 : LOG_E("%d : Close PDP context failed",     result); break;
+    case 563 : LOG_W("%d : Socket identity has been used", result); break;
+    case 564 : LOG_E("%d : DNS busy",                     result); break;
+    case 565 : LOG_E("%d : DNS parse failed",             result); break;
+    case 566 : LOG_E("%d : Socket connect failed",        result); break;
+    // case 567 : LOG_W("%d : Socket has been closed",       result); break;
+    case 567 : break;
+    case 568 : LOG_E("%d : Operation busy",               result); break;
+    case 569 : LOG_E("%d : Operation timeout",            result); break;
+    case 570 : LOG_E("%d : PDP context broken down",      result); break;
+    case 571 : LOG_E("%d : Cancel send",                  result); break;
+    case 572 : LOG_E("%d : Operation not allowed",        result); break;
+    case 573 : LOG_E("%d : APN not configured",           result); break;
+    case 574 : LOG_E("%d : Port busy",                    result); break;
+    default  : LOG_E("%d : Unknown err code",             result); break;
+    }
+}
+
+
+static int bc26_socket_event_send(struct at_device *device, uint32_t event)
+{
+    return (int) rt_event_send(device->socket_event, event);
+}
+
+static int bc26_socket_event_recv(struct at_device *device, uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = RT_EOK;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(device->socket_event, event, option | RT_EVENT_FLAG_CLEAR, timeout, &recved);
+    if (result != RT_EOK)
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    return recved;
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int bc26_socket_close(struct at_socket *socket)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+    
+    result = at_obj_exec_cmd(device->client, resp, "AT+QICLOSE=%d", device_socket);
+
+    at_delete_resp(resp);
+
+    return result;
+}
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int bc26_socket_connect(struct at_socket *socket, char *ip, int32_t port,
+    enum at_socket_type type, rt_bool_t is_client)
+{
+    #define CONN_RETRY  2
+
+    int i = 0;
+    const char *type_str = RT_NULL;
+    uint32_t event = 0;
+    at_response_t resp = RT_NULL;
+    int result = 0, event_result = 0;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    if ( ! is_client)
+    {
+        return -RT_ERROR;
+    }
+
+    switch(type)
+    {
+        case AT_SOCKET_TCP:
+            type_str = "TCP";
+            break;
+        case AT_SOCKET_UDP:
+            type_str = "UDP";
+            break;
+        default:
+            LOG_E("%s device socket(%d)  connect type error.", device->name, device_socket);
+            return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    for(i=0; i<CONN_RETRY; i++)
+    {
+        /* clear socket connect event */
+        event = SET_EVENT(device_socket, BC26_EVENT_CONN_OK | BC26_EVENT_CONN_FAIL);
+        bc26_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+        if (at_obj_exec_cmd(device->client, resp, "AT+QIOPEN=1,%d,\"%s\",\"%s\",%d,0,1", 
+                            device_socket, type_str, ip, port) < 0)
+        {
+            result = -RT_ERROR;
+            break;
+        }
+
+        /* waiting result event from AT URC, the device default connection timeout is 60 seconds*/
+        if (bc26_socket_event_recv(device, SET_EVENT(device_socket, 0), 
+                                    60 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect result timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            break;
+        }
+        /* waiting OK or failed result */
+        event_result = bc26_socket_event_recv(device, BC26_EVENT_CONN_OK | BC26_EVENT_CONN_FAIL, 
+                                                1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            break;
+        }
+        /* check result */
+        if (event_result & BC26_EVENT_CONN_OK)
+        {
+            result = RT_EOK;
+            break;
+        }
+        
+        LOG_D("%s device socket(%d) connect failed, the socket was not be closed and now will connect retry.",
+                    device->name, device_socket);
+        if (bc26_socket_close(socket) < 0)
+        {
+            result = -RT_ERROR;
+            break;
+        }
+    }
+
+    if (i == CONN_RETRY)
+    {
+        LOG_E("%s device socket(%d) connect failed.", device->name, device_socket);
+        result = -RT_ERROR;
+    }
+    
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_get_send_size(struct at_socket *socket, size_t *size, size_t *acked, size_t *nacked)
+{
+    int result = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+QISEND=%d,0", device_socket) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "+QISEND:", "+QISEND: %d,%d,%d", size, acked, nacked) <= 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_wait_send_finish(struct at_socket *socket, size_t settings_size)
+{
+    /* get the timeout by the input data size */
+    rt_tick_t timeout = rt_tick_from_millisecond(settings_size);
+    rt_tick_t last_time = rt_tick_get();
+    size_t size = 0, acked = 0, nacked = 0xFFFF;
+
+    while (rt_tick_get() - last_time <= timeout)
+    {
+        at_get_send_size(socket, &size, &acked, &nacked);
+        if (nacked == 0)
+        {
+            return RT_EOK;
+        }
+        rt_thread_mdelay(100);
+    }
+
+    return -RT_ETIMEOUT;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int bc26_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    uint32_t event = 0;
+    int result = 0, event_result = 0;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    struct at_device_bc26 *bc26 = (struct at_device_bc26 *) device->user_data;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+
+    resp = at_create_resp(128, 2, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* set current socket for send URC event */
+    bc26->user_data = (void *) device_socket;
+
+    /* clear socket send event */
+    event = SET_EVENT(device_socket, BC26_EVENT_SEND_OK | BC26_EVENT_SEND_FAIL);
+    bc26_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    /* set AT client end sign to deal with '>' sign.*/
+    at_obj_set_end_sign(device->client, '>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < BC26_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = BC26_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+QISEND" commands to AT server than receive the '>' response on the first line. */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QISEND=%d,%d", device_socket, (int)cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        rt_thread_mdelay(5);//delay at least 4ms
+        
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* waiting result event from AT URC */
+        event = SET_EVENT(device_socket, 0);
+        event_result = bc26_socket_event_recv(device, event, 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait event timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* waiting OK or failed result */
+        event = BC26_EVENT_SEND_OK | BC26_EVENT_SEND_FAIL;
+        event_result = bc26_socket_event_recv(device, event, 1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait sned OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* check result */
+        if (event_result & BC26_EVENT_SEND_FAIL)
+        {
+            LOG_E("%s device socket(%d) send failed.", device->name, device_socket);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (type == AT_SOCKET_TCP)
+        {
+            at_wait_send_finish(socket, 2*cur_pkt_size);
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data conflict */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result > 0 ? sent_size : result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int bc26_domain_resolve(const char *name, char ip[16])
+{
+    #define RESOLVE_RETRY  3
+
+    int i, result;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    struct at_device_bc26 *bc26 = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first init device failed.");
+        return -RT_ERROR;
+    }
+
+    /* the maximum response time is 60 seconds, but it set to 10 seconds is convenient to use. */
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (!resp)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* clear BC26_EVENT_DOMAIN_OK */
+    bc26_socket_event_recv(device, BC26_EVENT_DOMAIN_OK, 0, RT_EVENT_FLAG_OR);
+    
+    bc26 = (struct at_device_bc26 *) device->user_data;
+    bc26->socket_data = ip;
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+QIDNSGIP=1,\"%s\"", name) != RT_EOK)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    for(i = 0; i < RESOLVE_RETRY; i++)
+    {
+        /* waiting result event from AT URC, the device default connection timeout is 30 seconds.*/
+        if (bc26_socket_event_recv(device, BC26_EVENT_DOMAIN_OK, 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            result = -RT_ETIMEOUT;
+            continue;
+        }
+        else
+        {
+            if (rt_strlen(ip) < 8)
+            {
+                rt_thread_mdelay(100);
+                /* resolve failed, maybe receive an URC CRLF */
+                result = -RT_ERROR;
+                continue;
+            }
+            else
+            {
+                result = RT_EOK;
+                break;
+            }
+        }
+    }
+
+ __exit:
+    bc26->socket_data = RT_NULL;
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void bc26_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static void urc_connect_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0, result = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+QIOPEN: %d,%d", &device_socket , &result);
+
+    if (result == 0)
+    {
+        bc26_socket_event_send(device, SET_EVENT(device_socket, BC26_EVENT_CONN_OK));
+    }
+    else
+    {
+        at_tcp_ip_errcode_parse(result);
+        bc26_socket_event_send(device, SET_EVENT(device_socket, BC26_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_send_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    struct at_device_bc26 *bc26 = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+    
+    bc26 = (struct at_device_bc26 *) device->user_data;
+    device_socket = (int) bc26->user_data;
+
+    if (rt_strstr(data, "SEND OK"))
+    {
+        bc26_socket_event_send(device, SET_EVENT(device_socket, BC26_EVENT_SEND_OK));
+    }
+    else if (rt_strstr(data, "SEND FAIL"))
+    {
+        bc26_socket_event_send(device, SET_EVENT(device_socket, BC26_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+QIURC: \"closed\",%d", &device_socket);
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the socket is disconnect by remote */
+    if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, NULL, 0);
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket and receive buffer size by receive data */
+    sscanf(data, "+QIURC: \"recv\",%d,%d", &device_socket, (int *) &bfsz);
+    /* set receive timeout by receive buffer length, not less than 10 ms */
+    timeout = bfsz > 10 ? bfsz : 10;
+
+    if (device_socket < 0 || bfsz == 0)
+    {
+        return;
+    }
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory for URC receive buffer(%d).", bfsz);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("%s device receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+static void urc_dnsqip_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int i = 0, j = 0;
+    char recv_ip[16] = {0};
+    int result, ip_count, dns_ttl;
+    struct at_device *device = RT_NULL;
+    struct at_device_bc26 *bc26 = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+    
+    bc26 = (struct at_device_bc26 *) device->user_data;
+    if (bc26->socket_data == RT_NULL)
+    {
+        LOG_D("%s device socket_data no config.", bc26->device_name);
+        return;
+    }
+
+    for (i = 0; i < size; i++)
+    {
+        if (*(data + i) == '.')
+            j++;
+    }
+    /* There would be several dns result, we just pickup one */
+    if (j == 3)
+    {
+        sscanf(data, "+QIURC: \"dnsgip\",\"%[^\"]", recv_ip);
+        recv_ip[15] = '\0';
+
+        rt_memcpy(bc26->socket_data, recv_ip, sizeof(recv_ip));
+
+        bc26_socket_event_send(device, BC26_EVENT_DOMAIN_OK);
+    }
+    else
+    {
+        sscanf(data, "+QIURC: \"dnsgip\",%d,%d,%d", &result, &ip_count, &dns_ttl);
+        if (result)
+        {
+            at_tcp_ip_errcode_parse(result);
+        }
+    }
+}
+
+static void urc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data);
+
+    LOG_I("URC data : %.*s", size, data);
+}
+
+static void urc_qiurc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data && size);
+
+    switch(*(data + 9))
+    {
+    case 'c' : urc_close_func(client, data, size); break;//+QIURC: "closed"
+    case 'r' : urc_recv_func(client, data, size); break;//+QIURC: "recv"
+    case 'd' : urc_dnsqip_func(client, data, size); break;//+QIURC: "dnsgip"
+    default  : urc_func(client, data, size);      break;
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"SEND OK",     "\r\n",                 urc_send_func},
+    {"SEND FAIL",   "\r\n",                 urc_send_func},
+    {"+QIOPEN:",    "\r\n",                 urc_connect_func},
+    {"+QIURC:",     "\r\n",                 urc_qiurc_func},
+};
+
+static const struct at_socket_ops bc26_socket_ops =
+{
+    bc26_socket_connect,
+    bc26_socket_close,
+    bc26_socket_send,
+    bc26_domain_resolve,
+    bc26_socket_set_event_cb,
+};
+
+int bc26_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int bc26_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_BC26_SOCKETS_NUM;
+    class->socket_ops = &bc26_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_BC26 && AT_USING_SOCKET */
+

class/bc28/at_device_bc28.c

@@ -0,0 +1,953 @@
+ /*
+ * File      : at_device_bc28.c
+ * This file is part of RT-Thread RTOS
+ * Copyright (c) 2020, RudyLo <luhuadong@163.com>
+ * 
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-02-12     luhuadong         first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_bc28.h>
+
+#define LOG_TAG                        "at.dev.bc28"
+#include <at_log.h>
+
+#ifdef AT_DEVICE_USING_BC28
+
+#define BC28_WAIT_CONNECT_TIME          5000
+#define BC28_THREAD_STACK_SIZE          2048
+#define BC28_THREAD_PRIORITY            (RT_THREAD_PRIORITY_MAX/2)
+
+static int bc28_sleep(struct at_device *device)
+{
+    return(RT_EOK);
+}
+
+static int bc28_wakeup(struct at_device *device)
+{
+    return(RT_EOK);
+}
+
+static int bc28_reset(struct at_device *device)
+{
+    struct at_device_bc28 *bc28 = (struct at_device_bc28 *)device->user_data;
+
+    rt_pin_mode(bc28->power_pin, PIN_MODE_OUTPUT);
+    rt_pin_write(bc28->power_pin, PIN_HIGH);
+    rt_thread_mdelay(300);
+    rt_pin_write(bc28->power_pin, PIN_LOW);
+    bc28->power_status = 1;
+
+    return(RT_EOK);
+}
+
+static int bc28_check_link_status(struct at_device *device)
+{
+    at_response_t resp = RT_NULL;
+    struct at_device_bc28 *bc28 = RT_NULL;
+    int result = -RT_ERROR;
+    
+    bc28 = (struct at_device_bc28 *)device->user_data;
+    if ( ! bc28->power_status) // power off
+    {
+        LOG_E("the power is off.");
+        return(-RT_ERROR);
+    }
+    if (bc28->sleep_status)    // is sleep status
+    {
+        if (bc28->power_pin != -1)
+        {
+            rt_pin_write(bc28->power_pin, PIN_HIGH);
+            rt_thread_mdelay(100);
+            rt_pin_write(bc28->power_pin, PIN_LOW);
+            rt_thread_mdelay(200);
+        }
+    }
+    
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return(-RT_ERROR);
+    }
+
+    result = -RT_ERROR;
+    if (at_obj_exec_cmd(device->client, resp, "AT+CGATT?") == RT_EOK)
+    {
+        int link_stat = 0;
+        if (at_resp_parse_line_args_by_kw(resp, "+CGATT:", "+CGATT:%d", &link_stat) > 0)
+        {
+            if (link_stat == 1)
+            {
+                result = RT_EOK;
+            }
+        }
+    }
+
+    at_delete_resp(resp);    
+    return(result);
+}
+
+/* =============================  bc28 network interface operations ============================= */
+/* set bc28 network interface device status and address information */
+static int bc28_netdev_set_info(struct netdev *netdev)
+{
+#define BC28_INFO_RESP_SIZE        128
+#define BC28_INFO_RESP_TIMOUT      rt_tick_from_millisecond(5000)
+
+    int result = RT_EOK;
+    ip_addr_t addr;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    /* set network interface device status */
+    netdev_low_level_set_status(netdev, RT_TRUE);
+    netdev_low_level_set_link_status(netdev, RT_TRUE);
+    netdev_low_level_set_dhcp_status(netdev, RT_TRUE);
+
+    resp = at_create_resp(BC28_INFO_RESP_SIZE, 0, BC28_INFO_RESP_TIMOUT);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* set network interface device hardware address(IMEI) */
+    {
+        #define BC28_NETDEV_HWADDR_LEN   8
+        #define BC28_IMEI_LEN            15
+
+        char imei[BC28_IMEI_LEN] = {0};
+        int i = 0, j = 0;
+
+        /* send "AT+CGSN=1" commond to get device IMEI */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CGSN=1") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        if (at_resp_parse_line_args(resp, 2, "+CGSN:%s", imei) <= 0)
+        {
+            LOG_E("%s device prase \"AT+CGSN=1\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        LOG_D("%s device IMEI number: %s", device->name, imei);
+
+        netdev->hwaddr_len = BC28_NETDEV_HWADDR_LEN;
+        /* get hardware address by IMEI */
+        for (i = 0, j = 0; i < BC28_NETDEV_HWADDR_LEN && j < BC28_IMEI_LEN; i++, j+=2)
+        {
+            if (j != BC28_IMEI_LEN - 1)
+            {
+                netdev->hwaddr[i] = (imei[j] - '0') * 10 + (imei[j + 1] - '0');
+            }
+            else
+            {
+                netdev->hwaddr[i] = (imei[j] - '0');
+            }
+        }
+    }
+
+    /* set network interface device IP address */
+    {
+        #define IP_ADDR_SIZE_MAX    16
+        char ipaddr[IP_ADDR_SIZE_MAX] = {0};
+        
+        /* send "AT+CGPADDR" commond to get IP address */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CGPADDR") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* parse response data "+CGPADDR: 0,<IP_address>" */
+        if (at_resp_parse_line_args_by_kw(resp, "+CGPADDR:", "+CGPADDR:%*d,%s", ipaddr) <= 0)
+        {
+            LOG_E("%s device \"AT+CGPADDR\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("%s device IP address: %s", device->name, ipaddr);
+
+        /* set network interface address information */
+        inet_aton(ipaddr, &addr);
+        netdev_low_level_set_ipaddr(netdev, &addr);
+    }
+
+    /* set network interface device dns server */
+    {
+        #define DNS_ADDR_SIZE_MAX   16
+        char dns_server1[DNS_ADDR_SIZE_MAX] = {0}, dns_server2[DNS_ADDR_SIZE_MAX] = {0};
+        
+        /* send "AT+QIDNSCFG?" commond to get DNS servers address */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QIDNSCFG?") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* parse response data "PrimaryDns:<pri_dns>" 
+         *                     "SecondaryDns:<sec_dns>" 
+        */
+        if (at_resp_parse_line_args_by_kw(resp, "PrimaryDns:", "PrimaryDns: %s", dns_server1) <= 0)
+        {
+            LOG_E("%s device prase \"AT+QIDNSCFG?\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        if (at_resp_parse_line_args_by_kw(resp, "SecondaryDns:", "SecondaryDns: %s", dns_server2) <= 0)
+        {
+            LOG_E("%s device prase \"AT+QIDNSCFG?\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("%s device primary DNS server address: %s", device->name, dns_server1);
+        LOG_D("%s device secondary DNS server address: %s", device->name, dns_server2);
+
+        inet_aton(dns_server1, &addr);
+        netdev_low_level_set_dns_server(netdev, 0, &addr);
+
+        inet_aton(dns_server2, &addr);
+        netdev_low_level_set_dns_server(netdev, 1, &addr);
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static void bc28_check_link_status_entry(void *parameter)
+{
+#define BC28_LINK_DELAY_TIME    (60 * RT_TICK_PER_SECOND)
+
+    rt_bool_t is_link_up;
+    struct at_device *device = RT_NULL;
+    struct netdev *netdev = (struct netdev *) parameter;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return;
+    }
+    
+    while (1)
+    {
+        is_link_up = (bc28_check_link_status(device) == RT_EOK);
+
+        netdev_low_level_set_link_status(netdev, is_link_up);
+
+        rt_thread_delay(BC28_LINK_DELAY_TIME);
+    }
+}
+
+static int bc28_netdev_check_link_status(struct netdev *netdev)
+{
+#define BC28_LINK_THREAD_STACK_SIZE     (1024 + 512)
+#define BC28_LINK_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX - 2)
+
+    rt_thread_t tid;
+    char tname[RT_NAME_MAX] = {0};
+
+    RT_ASSERT(netdev);
+
+    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);
+
+    /* create bc28 link status polling thread  */
+    tid = rt_thread_create(tname, bc28_check_link_status_entry, (void *)netdev,
+                           BC28_LINK_THREAD_STACK_SIZE, BC28_LINK_THREAD_PRIORITY, 20);
+    if (tid != RT_NULL)
+    {
+        rt_thread_startup(tid);
+    }
+
+    return RT_EOK;
+}
+
+static int bc28_net_init(struct at_device *device);
+
+static int bc28_netdev_set_up(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_FALSE)
+    {
+        bc28_net_init(device);
+        device->is_init = RT_TRUE;
+
+        netdev_low_level_set_status(netdev, RT_TRUE);
+        LOG_D("network interface device(%s) set up status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int bc28_netdev_set_down(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_TRUE)
+    {
+        //bc28_power_off(device);
+        device->is_init = RT_FALSE;
+
+        netdev_low_level_set_status(netdev, RT_FALSE);
+        LOG_D("network interface device(%s) set down status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int bc28_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server)
+{
+#define BC28_DNS_RESP_LEN      64
+#define BC28_DNS_RESP_TIMEOUT  rt_tick_from_millisecond(300)
+
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(dns_server);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(BC28_DNS_RESP_LEN, 0, BC28_DNS_RESP_TIMEOUT);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* send "AT+QIDNSCFG=<pri_dns>[,<sec_dns>]" commond to set dns servers */
+    if (at_obj_exec_cmd(device->client, resp, "AT+QIDNSCFG=%d,%s", 
+        dns_num, inet_ntoa(*dns_server)) != RT_EOK)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    netdev_low_level_set_dns_server(netdev, dns_num, dns_server);
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+#ifdef AT_USING_SOCKET
+    int bc28_domain_resolve(const char *name, char ip[16]);
+#endif
+#ifdef NETDEV_USING_PING
+static int bc28_netdev_ping(struct netdev *netdev, const char *host,
+        size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp)
+{
+#define BC28_PING_RESP_SIZE       128
+#define BC28_PING_IP_SIZE         16
+#define BC28_PING_TIMEOUT         (10 * RT_TICK_PER_SECOND)
+
+    rt_err_t result = RT_EOK;
+    int response = -1, recv_data_len, ping_time, ttl;
+    char ip_addr[BC28_PING_IP_SIZE] = {0};
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(host);
+    RT_ASSERT(ping_resp);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(BC28_PING_RESP_SIZE, 4, BC28_PING_TIMEOUT);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create");
+        return -RT_ENOMEM;
+    }
+
+    /* DNS resolve */
+    struct in_addr inp;
+    if (inet_aton(host, &inp) > 0)
+    {
+        rt_strncpy(ip_addr, host, BC28_PING_IP_SIZE);
+    }
+#ifdef AT_USING_SOCKET
+    else
+    {
+        bc28_domain_resolve(host, ip_addr);
+    }
+#endif
+    
+    if (at_obj_exec_cmd(device->client, resp, "AT+NPING=%s,%d,%d", 
+                        ip_addr, data_len, timeout*1000/RT_TICK_PER_SECOND) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "+NPINGERR:", "+NPINGERR:%d", &response) > 0)
+    {
+        switch (response)
+        {
+        case 1:
+            result = -RT_ETIMEOUT;
+            break;
+        case 2:
+        default:
+            result = -RT_ERROR;
+            break;
+        }
+    }
+    else if (at_resp_parse_line_args_by_kw(resp, "+NPING:", "+NPING:%[^,],%d,%d",
+                                            ip_addr, &ttl, &ping_time) > 0 )
+    {
+        inet_aton(ip_addr, &(ping_resp->ip_addr));
+        ping_resp->data_len = data_len;
+        ping_resp->ticks = rt_tick_from_millisecond(ping_time);
+        ping_resp->ttl = ttl;
+        result = RT_EOK;
+    }
+    else
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+#endif /* NETDEV_USING_PING */
+
+const struct netdev_ops bc28_netdev_ops =
+{
+    bc28_netdev_set_up,
+    bc28_netdev_set_down,
+
+    RT_NULL,
+    bc28_netdev_set_dns_server,
+    RT_NULL,
+
+#ifdef NETDEV_USING_PING
+    bc28_netdev_ping,
+#endif
+    RT_NULL,
+};
+
+static struct netdev *bc28_netdev_add(const char *netdev_name)
+{
+#define ETHERNET_MTU        1500
+#define HWADDR_LEN          8
+    struct netdev *netdev = RT_NULL;
+
+    netdev = (struct netdev *)rt_calloc(1, sizeof(struct netdev));
+    if (netdev == RT_NULL)
+    {
+        LOG_E("no memory for netdev create.");
+        return RT_NULL;
+    }
+
+    netdev->mtu = ETHERNET_MTU;
+    netdev->ops = &bc28_netdev_ops;
+    netdev->hwaddr_len = HWADDR_LEN;
+
+#ifdef SAL_USING_AT
+    extern int sal_at_netdev_set_pf_info(struct netdev *netdev);
+    /* set the network interface socket/netdb operations */
+    sal_at_netdev_set_pf_info(netdev);
+#endif
+
+    netdev_register(netdev, netdev_name, RT_NULL);
+
+    return netdev;
+}
+
+/* =============================  bc28 device operations ============================= */
+
+/* initialize for bc28 */
+static void bc28_init_thread_entry(void *parameter)
+{
+#define INIT_RETRY                     5
+#define CPIN_RETRY                     5
+#define CSQ_RETRY                      20
+#define CGREG_RETRY                    50
+#define IPADDR_RETRY                   10
+#define AT_DEFAULT_TIMEOUT             5000
+
+    int i;
+    int retry_num = INIT_RETRY;
+    rt_err_t result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = (struct at_device *) parameter;
+    struct at_client *client = device->client;
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(AT_DEFAULT_TIMEOUT));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    LOG_D("start init %s device.", device->name);
+
+    while (retry_num--)
+    {
+        /* reset the bc28 device */
+        bc28_reset(device);
+        rt_thread_mdelay(1000);
+
+        /* wait bc28 startup finish, send AT every 500ms, if receive OK, SYNC success*/
+        if (at_client_obj_wait_connect(client, BC28_WAIT_CONNECT_TIME))
+        {
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        
+        /* disable echo */
+        if (at_obj_exec_cmd(device->client, resp, "ATE0") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E("ATE0");
+            goto __exit;
+        }
+
+        /* disable auto register */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QREGSWT=2") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+QREGSWT=2");
+            goto __exit;
+        }
+        
+        /* disable auto connect */
+        if (at_obj_exec_cmd(device->client, resp, "AT+NCONFIG=AUTOCONNECT,FALSE") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+NCONFIG=AUTOCONNECT,FALSE");
+            goto __exit;
+        }
+
+        /* reboot */
+        at_obj_exec_cmd(device->client, resp, "AT+NRB");
+        rt_thread_mdelay(5000);
+
+        while (at_obj_exec_cmd(device->client, resp, "AT") != RT_EOK)
+        {
+            rt_thread_mdelay(1000);
+        }
+
+        /* check IMEI */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CGSN=1") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+CGSN=1");
+            goto __exit;
+        }
+
+        /* search band 8 */
+        if (at_obj_exec_cmd(device->client, resp, "AT+NBAND=8") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+NBAND=8");
+            goto __exit;
+        }
+
+        /* set max function */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CFUN=1") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+CFUN=1");
+            goto __exit;
+        }
+
+        /* auto report recv from tcp */
+        if (at_obj_exec_cmd(device->client, resp, "AT+NSONMI=2") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+NSONMI=2");
+            goto __exit;
+        }
+
+        /* disable eDRX mode  */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CEDRXS=0,5") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+CEDRXS=0,5");
+            goto __exit;
+        }
+        
+        /* disable PSM mode  */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CPSMS=0") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+CPSMS=0");
+            goto __exit;
+        }
+
+        /* check IMSI */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CIMI") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+CIMI");
+            goto __exit;
+        }
+
+        /* attach */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CGATT=1") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+CGATT=1");
+            goto __exit;
+        }
+        
+        /* Get the baudrate */
+        if (at_obj_exec_cmd(device->client, resp, "AT+NATSPEED?") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> AT+NATSPEED?");
+            goto __exit;
+        }
+        at_resp_parse_line_args_by_kw(resp, "+NATSPEED:", "+NATSPEED:%d", &i);
+        LOG_D("%s device baudrate %d", device->name, i);
+        
+        /* get module version */
+        if (at_obj_exec_cmd(device->client, resp, "ATI") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            LOG_E(">> ATI");
+            goto __exit;
+        }
+        for (i = 0; i < (int) resp->line_counts - 1; i++)
+        {
+            LOG_D("%s", at_resp_get_line(resp, i + 1));
+        }
+        
+        /* check SIM card */
+        for (i = 0; i < CPIN_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CPIN?") == RT_EOK)
+            {
+                if (at_resp_get_line_by_kw(resp, "READY") != RT_NULL)
+                    break;
+            }
+        }
+        if (i == CPIN_RETRY)
+        {
+            LOG_E("%s device SIM card detection failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* check signal strength */
+        for (i = 0; i < CSQ_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CSQ") == RT_EOK)
+            {
+                int signal_strength = 0, err_rate = 0;
+                
+                if (at_resp_parse_line_args_by_kw(resp, "+CSQ:", "+CSQ:%d,%d", &signal_strength, &err_rate) > 0)
+                {
+                    if ((signal_strength != 99) && (signal_strength != 0))
+                    {
+                        LOG_D("%s device signal strength: %d, channel bit error rate: %d",
+                                device->name, signal_strength, err_rate);
+                        break;
+                    }
+                }
+            }
+        }
+        if (i == CSQ_RETRY)
+        {
+            LOG_E("%s device signal strength check failed", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+                
+        /* check the GPRS network is registered */
+        for (i = 0; i < CGREG_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CGATT?") == RT_EOK)
+            {
+                int link_stat = 0;
+                
+                if (at_resp_parse_line_args_by_kw(resp, "+CGATT:", "+CGATT:%d", &link_stat) > 0)
+                {
+                    if (link_stat == 1)
+                    {
+                        LOG_D("%s device GPRS is registered", device->name);
+                        break;
+                    }
+                }
+            }
+        }
+        if (i == CGREG_RETRY)
+        {
+            LOG_E("%s device GPRS is register failed", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        /* check the GPRS network IP address */
+        for (i = 0; i < IPADDR_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CGPADDR") == RT_EOK)
+            {
+                #define IP_ADDR_SIZE_MAX    16
+                char ipaddr[IP_ADDR_SIZE_MAX] = {0};
+                
+                /* parse response data "+CGPADDR: 0,<IP_address>" */
+                if (at_resp_parse_line_args_by_kw(resp, "+CGPADDR:", "+CGPADDR:%*d,%s", ipaddr) > 0)
+                {
+                    LOG_D("%s device IP address: %s", device->name, ipaddr);
+                    break;
+                }
+            }
+        }
+        if (i == IPADDR_RETRY)
+        {
+            LOG_E("%s device GPRS is get IP address failed", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        /* initialize successfully  */
+        result = RT_EOK;
+        break;
+
+    __exit:
+        if (result != RT_EOK)
+        {
+            /* power off the bc28 device */
+            //bc28_power_off(device);
+            rt_thread_mdelay(1000);
+
+            LOG_I("%s device initialize retry...", device->name);
+        }
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (result == RT_EOK)
+    {
+        /* set network interface device status and address information */
+        bc28_netdev_set_info(device->netdev);
+        /* check and create link staus sync thread  */
+        if (rt_thread_find(device->netdev->name) == RT_NULL)
+        {
+            bc28_netdev_check_link_status(device->netdev);
+        }
+
+        LOG_I("%s device network initialize success.", device->name);
+    }
+    else
+    {
+        LOG_E("%s device network initialize failed(%d).", device->name, result);
+    }
+}
+
+/* bc28 device network initialize */
+static int bc28_net_init(struct at_device *device)
+{
+#ifdef AT_DEVICE_BC28_INIT_ASYN
+    rt_thread_t tid;
+
+    tid = rt_thread_create("bc28_net", bc28_init_thread_entry, (void *)device,
+                           BC28_THREAD_STACK_SIZE, BC28_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("create %s device init thread failed.", device->name);
+        return -RT_ERROR;
+    }
+#else
+    bc28_init_thread_entry(device);
+#endif /* AT_DEVICE_BC28_INIT_ASYN */
+
+    return RT_EOK;
+}
+
+static int bc28_init(struct at_device *device)
+{
+    struct at_device_bc28 *bc28 = (struct at_device_bc28 *)device->user_data;
+
+    /* initialize AT client */
+    at_client_init(bc28->client_name, bc28->recv_bufsz);
+
+    device->client = at_client_get(bc28->client_name);
+    if (device->client == RT_NULL)
+    {
+        LOG_E("get AT client(%s) failed.", bc28->client_name);
+        return -RT_ERROR;
+    }
+
+    /* register URC data execution function  */
+#ifdef AT_USING_SOCKET
+    bc28_socket_init(device);
+#endif
+
+    /* add bc28 device to the netdev list */
+    device->netdev = bc28_netdev_add(bc28->device_name);
+    if (device->netdev == RT_NULL)
+    {
+        LOG_E("add netdev(%s) failed.", bc28->device_name);
+        return -RT_ERROR;
+    }
+
+    /* initialize bc28 pin configuration */
+    if (bc28->power_pin != -1)
+    {
+        rt_pin_mode(bc28->power_pin, PIN_MODE_OUTPUT);
+        rt_pin_write(bc28->power_pin, PIN_LOW);
+    }
+
+    /* initialize bc28 device network */
+    return bc28_netdev_set_up(device->netdev);
+}
+
+static int bc28_deinit(struct at_device *device)
+{
+    RT_ASSERT(device);
+    
+    return bc28_netdev_set_down(device->netdev);
+}
+
+static int bc28_control(struct at_device *device, int cmd, void *arg)
+{
+    int result = -RT_ERROR;
+
+    RT_ASSERT(device);
+
+    switch (cmd)
+    {
+    case AT_DEVICE_CTRL_RESET:
+        result = bc28_reset(device);
+        break;
+    case AT_DEVICE_CTRL_SLEEP:
+    case AT_DEVICE_CTRL_WAKEUP:
+    case AT_DEVICE_CTRL_POWER_ON:
+    case AT_DEVICE_CTRL_POWER_OFF:
+    case AT_DEVICE_CTRL_LOW_POWER:
+    case AT_DEVICE_CTRL_NET_CONN:
+    case AT_DEVICE_CTRL_NET_DISCONN:
+    case AT_DEVICE_CTRL_SET_WIFI_INFO:
+    case AT_DEVICE_CTRL_GET_SIGNAL:
+    case AT_DEVICE_CTRL_GET_GPS:
+    case AT_DEVICE_CTRL_GET_VER:
+        LOG_W("not support the control command(%d).", cmd);
+        break;
+    default:
+        LOG_E("input error control command(%d).", cmd);
+        break;
+    }
+
+    return result;
+}
+
+const struct at_device_ops bc28_device_ops =
+{
+    bc28_init,
+    bc28_deinit,
+    bc28_control,
+};
+
+static int bc28_device_class_register(void)
+{
+    struct at_device_class *class = RT_NULL;
+
+    class = (struct at_device_class *) rt_calloc(1, sizeof(struct at_device_class));
+    if (class == RT_NULL)
+    {
+        LOG_E("no memory for device class create.");
+        return -RT_ENOMEM;
+    }
+
+    /* fill bc28 device class object */
+#ifdef AT_USING_SOCKET
+    bc28_socket_class_register(class);
+#endif
+    class->device_ops = &bc28_device_ops;
+
+    return at_device_class_register(class, AT_DEVICE_CLASS_BC28);
+}
+INIT_DEVICE_EXPORT(bc28_device_class_register);
+
+#endif /* AT_DEVICE_USING_BC28 */

class/bc28/at_device_bc28.h

@@ -0,0 +1,70 @@
+ /*
+ * File      : at_device_bc28.h
+ * This file is part of RT-Thread RTOS
+ * Copyright (c) 2020, RudyLo <luhuadong@163.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-02-12     luhuadong         first version
+ */
+
+#ifndef __AT_DEVICE_BC28_H__
+#define __AT_DEVICE_BC28_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the BC28 device */
+#define AT_DEVICE_BC28_SOCKETS_NUM  7
+
+struct at_device_bc28
+{
+    char *device_name;
+    char *client_name;
+
+    int power_pin;          /* BC28 has not power_en, it should be reset pin */
+    int power_status_pin;   /* ADC */
+    size_t recv_bufsz;
+    struct at_device device;
+
+    void *socket_data;
+    void *user_data;
+
+    rt_bool_t power_status;
+    rt_bool_t sleep_status;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* bc28 device socket initialize */
+int bc28_socket_init(struct at_device *device);
+
+/* bc28 device class socket register */
+int bc28_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_BC28_H__ */

class/bc28/at_socket_bc28.c

@@ -0,0 +1,773 @@
+/*
+ * File      : at_socket_bc28.c
+ * This file is part of RT-Thread RTOS
+ * Copyright (c) 2020, RudyLo <luhuadong@163.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-02-13     luhuadong         first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_bc28.h>
+
+#define LOG_TAG                        "at.skt.bc28"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_BC28) && defined(AT_USING_SOCKET)
+
+#define BC28_MODULE_SEND_MAX_SIZE       1024
+
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event)       (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define BC28_EVENT_CONN_OK             (1L << 0)
+#define BC28_EVENT_SEND_OK             (1L << 1)
+#define BC28_EVENT_RECV_OK             (1L << 2)
+#define BC28_EVNET_CLOSE_OK            (1L << 3)
+#define BC28_EVENT_CONN_FAIL           (1L << 4)
+#define BC28_EVENT_SEND_FAIL           (1L << 5)
+#define BC28_EVENT_DOMAIN_OK           (1L << 6)
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static void at_tcp_ip_errcode_parse(int result)//TCP/IP_QIGETERROR
+{
+    switch(result)
+    {
+    case 0   : LOG_D("%d : Operation successful",         result); break;
+    case 550 : LOG_E("%d : Unknown error",                result); break;
+    case 551 : LOG_E("%d : Operation blocked",            result); break;
+    case 552 : LOG_E("%d : Invalid parameters",           result); break;
+    case 553 : LOG_E("%d : Memory not enough",            result); break;
+    case 554 : LOG_E("%d : Create socket failed",         result); break;
+    case 555 : LOG_E("%d : Operation not supported",      result); break;
+    case 556 : LOG_E("%d : Socket bind failed",           result); break;
+    case 557 : LOG_E("%d : Socket listen failed",         result); break;
+    case 558 : LOG_E("%d : Socket write failed",          result); break;
+    case 559 : LOG_E("%d : Socket read failed",           result); break;
+    case 560 : LOG_E("%d : Socket accept failed",         result); break;
+    case 561 : LOG_E("%d : Open PDP context failed",      result); break;
+    case 562 : LOG_E("%d : Close PDP context failed",     result); break;
+    case 563 : LOG_W("%d : Socket identity has been used", result); break;
+    case 564 : LOG_E("%d : DNS busy",                     result); break;
+    case 565 : LOG_E("%d : DNS parse failed",             result); break;
+    case 566 : LOG_E("%d : Socket connect failed",        result); break;
+    // case 567 : LOG_W("%d : Socket has been closed",       result); break;
+    case 567 : break;
+    case 568 : LOG_E("%d : Operation busy",               result); break;
+    case 569 : LOG_E("%d : Operation timeout",            result); break;
+    case 570 : LOG_E("%d : PDP context broken down",      result); break;
+    case 571 : LOG_E("%d : Cancel send",                  result); break;
+    case 572 : LOG_E("%d : Operation not allowed",        result); break;
+    case 573 : LOG_E("%d : APN not configured",           result); break;
+    case 574 : LOG_E("%d : Port busy",                    result); break;
+    default  : LOG_E("%d : Unknown err code",             result); break;
+    }
+}
+
+
+static int bc28_socket_event_send(struct at_device *device, uint32_t event)
+{
+    return (int) rt_event_send(device->socket_event, event);
+}
+
+static int bc28_socket_event_recv(struct at_device *device, uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = RT_EOK;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(device->socket_event, event, option | RT_EVENT_FLAG_CLEAR, timeout, &recved);
+    if (result != RT_EOK)
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    return recved;
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int bc28_socket_close(struct at_socket *socket)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+    
+    result = at_obj_exec_cmd(device->client, resp, "AT+NSOCL=%d", device_socket);
+
+    at_delete_resp(resp);
+
+    return result;
+}
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int bc28_socket_connect(struct at_socket *socket, char *ip, int32_t port,
+    enum at_socket_type type, rt_bool_t is_client)
+{
+#define CONN_RETRY  2
+
+    int i = 0;
+    const char *type_str = RT_NULL;
+    uint32_t event = 0;
+    at_response_t resp = RT_NULL;
+    int result = 0, event_result = 0;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    if ( ! is_client)
+    {
+        return -RT_ERROR;
+    }
+
+    if (type != AT_SOCKET_TCP)
+    {
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    for(i=0; i<CONN_RETRY; i++)
+    {
+        /* clear socket connect event */
+        event = SET_EVENT(device_socket, BC28_EVENT_CONN_OK | BC28_EVENT_CONN_FAIL);
+        bc28_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+        if (at_obj_exec_cmd(device->client, resp, "AT+NSOCO=%d,%s,%d", 
+                            device_socket, ip, port) < 0)
+        {
+            result = -RT_ERROR;
+            break;
+        }
+
+        /* waiting result event from AT URC, the device default connection timeout is 60 seconds*/
+        if (bc28_socket_event_recv(device, SET_EVENT(device_socket, 0), 
+                                    60 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect result timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            break;
+        }
+        /* waiting OK or failed result */
+        event_result = bc28_socket_event_recv(device, BC28_EVENT_CONN_OK | BC28_EVENT_CONN_FAIL, 
+                                                1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            break;
+        }
+        /* check result */
+        if (event_result & BC28_EVENT_CONN_OK)
+        {
+            result = RT_EOK;
+            break;
+        }
+        
+        LOG_D("%s device socket(%d) connect failed, the socket was not be closed and now will connect retry.",
+                    device->name, device_socket);
+        if (bc28_socket_close(socket) < 0)
+        {
+            result = -RT_ERROR;
+            break;
+        }
+    }
+
+    if (i == CONN_RETRY)
+    {
+        LOG_E("%s device socket(%d) connect failed.", device->name, device_socket);
+        result = -RT_ERROR;
+    }
+    
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_get_send_size(struct at_socket *socket, size_t *size, size_t *acked, size_t *nacked)
+{
+    int result = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+QISEND=%d,0", device_socket) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "+QISEND:", "+QISEND: %d,%d,%d", size, acked, nacked) <= 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_wait_send_finish(struct at_socket *socket, size_t settings_size)
+{
+    /* get the timeout by the input data size */
+    rt_tick_t timeout = rt_tick_from_millisecond(settings_size);
+    rt_tick_t last_time = rt_tick_get();
+    size_t size = 0, acked = 0, nacked = 0xFFFF;
+
+    while (rt_tick_get() - last_time <= timeout)
+    {
+        at_get_send_size(socket, &size, &acked, &nacked);
+        if (nacked == 0)
+        {
+            return RT_EOK;
+        }
+        rt_thread_mdelay(100);
+    }
+
+    return -RT_ETIMEOUT;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int bc28_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    uint32_t event = 0;
+    int result = 0, event_result = 0;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    struct at_device_bc28 *bc28 = (struct at_device_bc28 *) device->user_data;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+
+    resp = at_create_resp(128, 2, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* set current socket for send URC event */
+    bc28->user_data = (void *) device_socket;
+
+    /* clear socket send event */
+    event = SET_EVENT(device_socket, BC28_EVENT_SEND_OK | BC28_EVENT_SEND_FAIL);
+    bc28_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    /* set AT client end sign to deal with '>' sign.*/
+    at_obj_set_end_sign(device->client, '>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < BC28_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = BC28_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+QISEND" commands to AT server than receive the '>' response on the first line. */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QISEND=%d,%d", device_socket, (int)cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        rt_thread_mdelay(5);//delay at least 4ms
+        
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* waiting result event from AT URC */
+        event = SET_EVENT(device_socket, 0);
+        event_result = bc28_socket_event_recv(device, event, 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait event timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* waiting OK or failed result */
+        event = BC28_EVENT_SEND_OK | BC28_EVENT_SEND_FAIL;
+        event_result = bc28_socket_event_recv(device, event, 1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait sned OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* check result */
+        if (event_result & BC28_EVENT_SEND_FAIL)
+        {
+            LOG_E("%s device socket(%d) send failed.", device->name, device_socket);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (type == AT_SOCKET_TCP)
+        {
+            at_wait_send_finish(socket, 2*cur_pkt_size);
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data conflict */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result > 0 ? sent_size : result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+int bc28_domain_resolve(const char *name, char ip[16])
+{
+    #define RESOLVE_RETRY  3
+
+    int i, result;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    struct at_device_bc28 *bc28 = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first init device failed.");
+        return -RT_ERROR;
+    }
+
+    /* the maximum response time is 60 seconds, but it set to 10 seconds is convenient to use. */
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (!resp)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* clear BC28_EVENT_DOMAIN_OK */
+    bc28_socket_event_recv(device, BC28_EVENT_DOMAIN_OK, 0, RT_EVENT_FLAG_OR);
+    
+    bc28 = (struct at_device_bc28 *) device->user_data;
+    bc28->socket_data = ip;
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+QDNS=0,%s", name) != RT_EOK)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    for(i = 0; i < RESOLVE_RETRY; i++)
+    {
+        /* waiting result event from AT URC, the device default connection timeout is 30 seconds.*/
+        if (bc28_socket_event_recv(device, BC28_EVENT_DOMAIN_OK, 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            result = -RT_ETIMEOUT;
+            continue;
+        }
+        else
+        {
+            if (rt_strlen(ip) < 8)
+            {
+                rt_thread_mdelay(100);
+                /* resolve failed, maybe receive an URC CRLF */
+                result = -RT_ERROR;
+                continue;
+            }
+            else
+            {
+                result = RT_EOK;
+                break;
+            }
+        }
+    }
+
+ __exit:
+    bc28->socket_data = RT_NULL;
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void bc28_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static void urc_connect_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0, result = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+QIOPEN: %d,%d", &device_socket , &result);
+
+    if (result == 0)
+    {
+        bc28_socket_event_send(device, SET_EVENT(device_socket, BC28_EVENT_CONN_OK));
+    }
+    else
+    {
+        at_tcp_ip_errcode_parse(result);
+        bc28_socket_event_send(device, SET_EVENT(device_socket, BC28_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_send_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    struct at_device_bc28 *bc28 = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+    
+    bc28 = (struct at_device_bc28 *) device->user_data;
+    device_socket = (int) bc28->user_data;
+
+    if (rt_strstr(data, "SEND OK"))
+    {
+        bc28_socket_event_send(device, SET_EVENT(device_socket, BC28_EVENT_SEND_OK));
+    }
+    else if (rt_strstr(data, "SEND FAIL"))
+    {
+        bc28_socket_event_send(device, SET_EVENT(device_socket, BC28_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+QIURC: \"closed\",%d", &device_socket);
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the socket is disconnect by remote */
+    if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, NULL, 0);
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket and receive buffer size by receive data */
+    sscanf(data, "+QIURC: \"recv\",%d,%d", &device_socket, (int *) &bfsz);
+    /* set receive timeout by receive buffer length, not less than 10 ms */
+    timeout = bfsz > 10 ? bfsz : 10;
+
+    if (device_socket < 0 || bfsz == 0)
+    {
+        return;
+    }
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory for URC receive buffer(%d).", bfsz);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("%s device receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+static void urc_dnsqip_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int i = 0, j = 0;
+    char recv_ip[16] = {0};
+    int result, ip_count, dns_ttl;
+    struct at_device *device = RT_NULL;
+    struct at_device_bc28 *bc28 = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+    
+    bc28 = (struct at_device_bc28 *) device->user_data;
+    if (bc28->socket_data == RT_NULL)
+    {
+        LOG_D("%s device socket_data no config.", bc28->device_name);
+        return;
+    }
+
+    sscanf(data, "+QDNS:%s", recv_ip);
+    recv_ip[15] = '\0';
+
+    rt_memcpy(bc28->socket_data, recv_ip, sizeof(recv_ip));
+
+    bc28_socket_event_send(device, BC28_EVENT_DOMAIN_OK);
+}
+
+static void urc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data);
+
+    LOG_I("URC data : %.*s", size, data);
+}
+
+static void urc_dns_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data && size);
+
+    urc_dnsqip_func(client, data, size);
+}
+
+static void urc_qiurc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data && size);
+
+    switch(*(data + 9))
+    {
+    case 'c' : urc_close_func(client, data, size); break;//+QIURC: "closed"
+    case 'r' : urc_recv_func(client, data, size); break;//+QIURC: "recv"
+    case 'd' : urc_dnsqip_func(client, data, size); break;//+QIURC: "dnsgip"
+    default  : urc_func(client, data, size);      break;
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"SEND OK",     "\r\n",                 urc_send_func},
+    {"SEND FAIL",   "\r\n",                 urc_send_func},
+    {"+QIOPEN:",    "\r\n",                 urc_connect_func},
+    {"+QIURC:",     "\r\n",                 urc_qiurc_func},
+    {"+QDNS:",      "\r\n",                 urc_dns_func},
+};
+
+static const struct at_socket_ops bc28_socket_ops =
+{
+    bc28_socket_connect,
+    bc28_socket_close,
+    bc28_socket_send,
+    bc28_domain_resolve,
+    bc28_socket_set_event_cb,
+};
+
+int bc28_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int bc28_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_BC28_SOCKETS_NUM;
+    class->socket_ops = &bc28_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_BC28 && AT_USING_SOCKET */
+

class/ec20/at_device_ec20.c

@@ -436,11 +436,14 @@ static int ec20_netdev_check_link_status(struct netdev *netdev)
 #define EC20_LINK_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX - 2)
 
     rt_thread_t tid;
+    char tname[RT_NAME_MAX] = {0};
 
     RT_ASSERT(netdev);
 
+    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);
+
     /* create ec20 link status polling thread  */
-    tid = rt_thread_create("ec20_link", ec20_check_link_status_entry, (void *)netdev,
+    tid = rt_thread_create(tname, ec20_check_link_status_entry, (void *)netdev,
                            EC20_LINK_THREAD_STACK_SIZE, EC20_LINK_THREAD_PRIORITY, EC20_LINK_THREAD_TICK);
     if (tid != RT_NULL)
     {
@@ -886,7 +889,11 @@ static void ec20_init_thread_entry(void *parameter)
     {
         /* set network interface device status and address information */
         ec20_netdev_set_info(device->netdev);
-        ec20_netdev_check_link_status(device->netdev);
+        /* check and create link staus sync thread  */
+        if (rt_thread_find(device->netdev->name) == RT_NULL)
+        {
+            ec20_netdev_check_link_status(device->netdev);
+        }
 
         LOG_I("%s device network initialize success.", device->name);
     }

class/ec200x/at_device_ec200x.h

@@ -0,0 +1,72 @@
+/*
+ * File      : at_device_ec200x.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-04-20     qiyongzhong       first version
+ */
+
+#ifndef __AT_DEVICE_EC200X_H__
+#define __AT_DEVICE_EC200X_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the ec200x device */
+#define AT_DEVICE_EC200X_SOCKETS_NUM  5
+
+struct at_device_ec200x
+{
+    char *device_name;
+    char *client_name;
+
+    int power_pin;
+    int power_status_pin;
+    int wakeup_pin;
+    size_t recv_line_num;
+    struct at_device device;
+
+    void *socket_data;
+    void *user_data;
+    
+    rt_bool_t power_status;
+    rt_bool_t sleep_status;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* ec200x device socket initialize */
+int ec200x_socket_init(struct at_device *device);
+
+/* ec200x device class socket register */
+int ec200x_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_EC200X_H__ */
+

class/ec200x/at_socket_ec200x.c

@@ -0,0 +1,803 @@
+/*
+ * File      : at_socket_ec200x.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-12-10     qiyongzhong  first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_ec200x.h>
+
+#define LOG_TAG                        "at.skt.ec200x"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_EC200X) && defined(AT_USING_SOCKET)
+
+#define EC200X_MODULE_SEND_MAX_SIZE       1460
+
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event)       (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define EC200X_EVENT_CONN_OK             (1L << 0)
+#define EC200X_EVENT_SEND_OK             (1L << 1)
+#define EC200X_EVENT_RECV_OK             (1L << 2)
+#define EC200X_EVNET_CLOSE_OK            (1L << 3)
+#define EC200X_EVENT_CONN_FAIL           (1L << 4)
+#define EC200X_EVENT_SEND_FAIL           (1L << 5)
+#define EC200X_EVENT_DOMAIN_OK           (1L << 6)
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static void at_tcp_ip_errcode_parse(int result)//TCP/IP_QIGETERROR
+{
+    switch(result)
+    {
+    case 0   : LOG_D("%d : Operation successful",         result); break;
+    case 550 : LOG_E("%d : Unknown error",                result); break;
+    case 551 : LOG_E("%d : Operation blocked",            result); break;
+    case 552 : LOG_E("%d : Invalid parameters",           result); break;
+    case 553 : LOG_E("%d : Memory not enough",            result); break;
+    case 554 : LOG_E("%d : Create socket failed",         result); break;
+    case 555 : LOG_E("%d : Operation not supported",      result); break;
+    case 556 : LOG_E("%d : Socket bind failed",           result); break;
+    case 557 : LOG_E("%d : Socket listen failed",         result); break;
+    case 558 : LOG_E("%d : Socket write failed",          result); break;
+    case 559 : LOG_E("%d : Socket read failed",           result); break;
+    case 560 : LOG_E("%d : Socket accept failed",         result); break;
+    case 561 : LOG_E("%d : Open PDP context failed",      result); break;
+    case 562 : LOG_E("%d : Close PDP context failed",     result); break;
+    case 563 : LOG_W("%d : Socket identity has been used", result); break;
+    case 564 : LOG_E("%d : DNS busy",                     result); break;
+    case 565 : LOG_E("%d : DNS parse failed",             result); break;
+    case 566 : LOG_E("%d : Socket connect failed",        result); break;
+    // case 567 : LOG_W("%d : Socket has been closed",       result); break;
+    case 567 : break;
+    case 568 : LOG_E("%d : Operation busy",               result); break;
+    case 569 : LOG_E("%d : Operation timeout",            result); break;
+    case 570 : LOG_E("%d : PDP context broken down",      result); break;
+    case 571 : LOG_E("%d : Cancel send",                  result); break;
+    case 572 : LOG_E("%d : Operation not allowed",        result); break;
+    case 573 : LOG_E("%d : APN not configured",           result); break;
+    case 574 : LOG_E("%d : Port busy",                    result); break;
+    default  : LOG_E("%d : Unknown err code",             result); break;
+    }
+}
+
+
+static int ec200x_socket_event_send(struct at_device *device, uint32_t event)
+{
+    return (int) rt_event_send(device->socket_event, event);
+}
+
+static int ec200x_socket_event_recv(struct at_device *device, uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = RT_EOK;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(device->socket_event, event, option | RT_EVENT_FLAG_CLEAR, timeout, &recved);
+    if (result != RT_EOK)
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    return recved;
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int ec200x_socket_close(struct at_socket *socket)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+    
+    result = at_obj_exec_cmd(device->client, resp, "AT+QICLOSE=%d", device_socket);
+
+    at_delete_resp(resp);
+
+    return result;
+}
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int ec200x_socket_connect(struct at_socket *socket, char *ip, int32_t port,
+    enum at_socket_type type, rt_bool_t is_client)
+{
+    #define CONN_RETRY  2
+
+    int i = 0;
+    const char *type_str = RT_NULL;
+    uint32_t event = 0;
+    at_response_t resp = RT_NULL;
+    int result = 0, event_result = 0;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    if ( ! is_client)
+    {
+        return -RT_ERROR;
+    }
+
+    switch(type)
+    {
+        case AT_SOCKET_TCP:
+            type_str = "TCP";
+            break;
+        case AT_SOCKET_UDP:
+            type_str = "UDP";
+            break;
+        default:
+            LOG_E("%s device socket(%d)  connect type error.", device->name, device_socket);
+            return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    for(i=0; i<CONN_RETRY; i++)
+    {
+        /* clear socket connect event */
+        event = SET_EVENT(device_socket, EC200X_EVENT_CONN_OK | EC200X_EVENT_CONN_FAIL);
+        ec200x_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+        if (at_obj_exec_cmd(device->client, resp, "AT+QIOPEN=1,%d,\"%s\",\"%s\",%d,0,1", 
+                            device_socket, type_str, ip, port) < 0)
+        {
+            result = -RT_ERROR;
+            break;
+        }
+
+        /* waiting result event from AT URC, the device default connection timeout is 60 seconds*/
+        if (ec200x_socket_event_recv(device, SET_EVENT(device_socket, 0), 
+                                    60 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect result timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            break;
+        }
+        /* waiting OK or failed result */
+        event_result = ec200x_socket_event_recv(device, EC200X_EVENT_CONN_OK | EC200X_EVENT_CONN_FAIL, 
+                                                1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            break;
+        }
+        /* check result */
+        if (event_result & EC200X_EVENT_CONN_OK)
+        {
+            result = RT_EOK;
+            break;
+        }
+        
+        LOG_D("%s device socket(%d) connect failed, the socket was not be closed and now will connect retry.",
+                    device->name, device_socket);
+        if (ec200x_socket_close(socket) < 0)
+        {
+            result = -RT_ERROR;
+            break;
+        }
+    }
+
+    if (i == CONN_RETRY)
+    {
+        LOG_E("%s device socket(%d) connect failed.", device->name, device_socket);
+        result = -RT_ERROR;
+    }
+    
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_get_send_size(struct at_socket *socket, size_t *size, size_t *acked, size_t *nacked)
+{
+    int result = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+QISEND=%d,0", device_socket) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "+QISEND:", "+QISEND: %d,%d,%d", size, acked, nacked) <= 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_wait_send_finish(struct at_socket *socket, size_t settings_size)
+{
+    /* get the timeout by the input data size */
+    rt_tick_t timeout = rt_tick_from_millisecond(settings_size);
+    rt_tick_t last_time = rt_tick_get();
+    size_t size = 0, acked = 0, nacked = 0xFFFF;
+
+    while (rt_tick_get() - last_time <= timeout)
+    {
+        at_get_send_size(socket, &size, &acked, &nacked);
+        if (nacked == 0)
+        {
+            return RT_EOK;
+        }
+        rt_thread_mdelay(100);
+    }
+
+    return -RT_ETIMEOUT;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int ec200x_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    uint32_t event = 0;
+    int result = 0, event_result = 0;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    struct at_device_ec200x *ec200x = (struct at_device_ec200x *) device->user_data;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+
+    resp = at_create_resp(128, 2, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* set current socket for send URC event */
+    ec200x->user_data = (void *) device_socket;
+
+    /* clear socket send event */
+    event = SET_EVENT(device_socket, EC200X_EVENT_SEND_OK | EC200X_EVENT_SEND_FAIL);
+    ec200x_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    /* set AT client end sign to deal with '>' sign.*/
+    at_obj_set_end_sign(device->client, '>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < EC200X_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = EC200X_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+QISEND" commands to AT server than receive the '>' response on the first line. */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QISEND=%d,%d", device_socket, (int)cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        //rt_thread_mdelay(5);//delay at least 4ms
+        
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* waiting result event from AT URC */
+        event = SET_EVENT(device_socket, 0);
+        event_result = ec200x_socket_event_recv(device, event, 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait event timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* waiting OK or failed result */
+        event = EC200X_EVENT_SEND_OK | EC200X_EVENT_SEND_FAIL;
+        event_result = ec200x_socket_event_recv(device, event, 1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait sned OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* check result */
+        if (event_result & EC200X_EVENT_SEND_FAIL)
+        {
+            LOG_E("%s device socket(%d) send failed.", device->name, device_socket);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (type == AT_SOCKET_TCP)
+        {
+            //at_wait_send_finish(socket, cur_pkt_size);
+            rt_thread_mdelay(10);
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data conflict */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result > 0 ? sent_size : result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int ec200x_domain_resolve(const char *name, char ip[16])
+{
+    #define RESOLVE_RETRY  3
+
+    int i, result;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    struct at_device_ec200x *ec200x = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first init device failed.");
+        return -RT_ERROR;
+    }
+
+    /* the maximum response time is 60 seconds, but it set to 10 seconds is convenient to use. */
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (!resp)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* clear EC200X_EVENT_DOMAIN_OK */
+    ec200x_socket_event_recv(device, EC200X_EVENT_DOMAIN_OK, 0, RT_EVENT_FLAG_OR);
+    
+    ec200x = (struct at_device_ec200x *) device->user_data;
+    ec200x->socket_data = ip;
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+QIDNSGIP=1,\"%s\"", name) != RT_EOK)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    for(i = 0; i < RESOLVE_RETRY; i++)
+    {
+        /* waiting result event from AT URC, the device default connection timeout is 30 seconds.*/
+        if (ec200x_socket_event_recv(device, EC200X_EVENT_DOMAIN_OK, 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            result = -RT_ETIMEOUT;
+            continue;
+        }
+        else
+        {
+            if (rt_strlen(ip) < 8)
+            {
+                rt_thread_mdelay(100);
+                /* resolve failed, maybe receive an URC CRLF */
+                result = -RT_ERROR;
+                continue;
+            }
+            else
+            {
+                result = RT_EOK;
+                break;
+            }
+        }
+    }
+
+ __exit:
+    ec200x->socket_data = RT_NULL;
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void ec200x_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static void urc_connect_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0, result = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+QIOPEN: %d,%d", &device_socket , &result);
+
+    if (result == 0)
+    {
+        ec200x_socket_event_send(device, SET_EVENT(device_socket, EC200X_EVENT_CONN_OK));
+    }
+    else
+    {
+        at_tcp_ip_errcode_parse(result);
+        ec200x_socket_event_send(device, SET_EVENT(device_socket, EC200X_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_send_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    struct at_device_ec200x *ec200x = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+    
+    ec200x = (struct at_device_ec200x *) device->user_data;
+    device_socket = (int) ec200x->user_data;
+
+    if (rt_strstr(data, "SEND OK"))
+    {
+        ec200x_socket_event_send(device, SET_EVENT(device_socket, EC200X_EVENT_SEND_OK));
+    }
+    else if (rt_strstr(data, "SEND FAIL"))
+    {
+        ec200x_socket_event_send(device, SET_EVENT(device_socket, EC200X_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+QIURC: \"closed\",%d", &device_socket);
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the socket is disconnect by remote */
+    if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, NULL, 0);
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket and receive buffer size by receive data */
+    sscanf(data, "+QIURC: \"recv\",%d,%d", &device_socket, (int *) &bfsz);
+    /* set receive timeout by receive buffer length, not less than 10 ms */
+    timeout = bfsz > 10 ? bfsz : 10;
+
+    if (device_socket < 0 || bfsz == 0)
+    {
+        return;
+    }
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory for URC receive buffer(%d).", bfsz);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("%s device receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+static void urc_pdpdeact_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int connectID = 0;
+
+    RT_ASSERT(data && size);
+
+    sscanf(data, "+QIURC: \"pdpdeact\",%d", &connectID);
+
+    LOG_E("context (%d) is deactivated.", connectID);
+}
+
+static void urc_dnsqip_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int i = 0, j = 0;
+    char recv_ip[16] = {0};
+    int result, ip_count, dns_ttl;
+    struct at_device *device = RT_NULL;
+    struct at_device_ec200x *ec200x = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+    
+    ec200x = (struct at_device_ec200x *) device->user_data;
+    if (ec200x->socket_data == RT_NULL)
+    {
+        LOG_D("%s device socket_data no config.", ec200x->device_name);
+        return;
+    }
+
+    for (i = 0; i < size; i++)
+    {
+        if (*(data + i) == '.')
+            j++;
+    }
+    /* There would be several dns result, we just pickup one */
+    if (j == 3)
+    {
+        sscanf(data, "+QIURC: \"dnsgip\",\"%[^\"]", recv_ip);
+        recv_ip[15] = '\0';
+
+        rt_memcpy(ec200x->socket_data, recv_ip, sizeof(recv_ip));
+
+        ec200x_socket_event_send(device, EC200X_EVENT_DOMAIN_OK);
+    }
+    else
+    {
+        sscanf(data, "+QIURC: \"dnsgip\",%d,%d,%d", &result, &ip_count, &dns_ttl);
+        if (result)
+        {
+            at_tcp_ip_errcode_parse(result);
+        }
+    }
+}
+
+static void urc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data);
+
+    LOG_I("URC data : %.*s", size, data);
+}
+
+static void urc_qiurc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data && size);
+
+    switch(*(data + 9))
+    {
+    case 'c' : urc_close_func(client, data, size); break;//+QIURC: "closed"
+    case 'r' : urc_recv_func(client, data, size); break;//+QIURC: "recv"
+    case 'p' : urc_pdpdeact_func(client, data, size); break;//+QIURC: "pdpdeact"
+    case 'd' : urc_dnsqip_func(client, data, size); break;//+QIURC: "dnsgip"
+    default  : urc_func(client, data, size);      break;
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"SEND OK",     "\r\n",                 urc_send_func},
+    {"SEND FAIL",   "\r\n",                 urc_send_func},
+    {"+QIOPEN:",    "\r\n",                 urc_connect_func},
+    {"+QIURC:",     "\r\n",                 urc_qiurc_func},
+};
+
+static const struct at_socket_ops ec200x_socket_ops =
+{
+    ec200x_socket_connect,
+    ec200x_socket_close,
+    ec200x_socket_send,
+    ec200x_domain_resolve,
+    ec200x_socket_set_event_cb,
+};
+
+int ec200x_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int ec200x_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_EC200X_SOCKETS_NUM;
+    class->socket_ops = &ec200x_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_EC200X && AT_USING_SOCKET */
+

class/esp32/at_device_esp32.c

@@ -0,0 +1,942 @@
+/*
+ * File      : at_socket_esp32.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-10-26     zylx         first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_esp32.h>
+
+#define LOG_TAG                        "at.dev.esp32"
+
+#include <at_log.h>
+
+#ifdef AT_DEVICE_USING_ESP32
+
+#define ESP32_WAIT_CONNECT_TIME      5000
+#define ESP32_THREAD_STACK_SIZE      2048
+#define ESP32_THREAD_PRIORITY        (RT_THREAD_PRIORITY_MAX / 2)
+
+/* =============================  esp32 network interface operations ============================= */
+
+static int esp32_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server);
+
+static void esp32_get_netdev_info(struct rt_work *work, void *work_data)
+{
+#define AT_ADDR_LEN          32
+#define AT_ERR_DNS_SERVER    "255.255.255.255"
+#define AT_DEF_DNS_SERVER    "114.114.114.114"
+
+    at_response_t resp = RT_NULL;
+    char ip[AT_ADDR_LEN] = {0}, mac[AT_ADDR_LEN] = {0};
+    char gateway[AT_ADDR_LEN] = {0}, netmask[AT_ADDR_LEN] = {0};
+    char dns_server1[AT_ADDR_LEN] = {0}, dns_server2[AT_ADDR_LEN] = {0};
+    const char *resp_expr = "%*[^\"]\"%[^\"]\"";
+    const char *resp_dns = "+CIPDNS:%s";
+    ip_addr_t ip_addr;
+    rt_uint32_t mac_addr[6] = {0};
+    rt_uint32_t num = 0;
+    rt_uint8_t dhcp_stat = 0;
+    struct rt_delayed_work *delay_work = (struct rt_delayed_work *)work;
+    struct at_device *device = (struct at_device *)work_data;
+    struct netdev *netdev = device->netdev;
+    struct at_client *client = device->client;
+
+    if (delay_work)
+    {
+        rt_free(delay_work);
+    }
+
+    resp = at_create_resp(512, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    /* send mac addr query commond "AT+CIFSR" and wait response */
+    if (at_obj_exec_cmd(client, resp, "AT+CIFSR") < 0)
+    {
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "STAMAC", resp_expr, mac) <= 0)
+    {
+        LOG_E("%s device parse \"AT+CIFSR\" cmd error.", device->name);
+        goto __exit;
+    }
+
+    /* send addr info query commond "AT+CIPSTA?" and wait response */
+    if (at_obj_exec_cmd(client, resp, "AT+CIPSTA?") < 0)
+    {
+        LOG_E("%s device send \"AT+CIPSTA?\" cmd error.", device->name);
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "ip", resp_expr, ip) <= 0 ||
+            at_resp_parse_line_args_by_kw(resp, "gateway", resp_expr, gateway) <= 0 ||
+            at_resp_parse_line_args_by_kw(resp, "netmask", resp_expr, netmask) <= 0)
+    {
+        LOG_E("%s device prase \"AT+CIPSTA?\" cmd error.", device->name);
+        goto __exit;
+    }
+
+    /* set netdev info */
+    inet_aton(gateway, &ip_addr);
+    netdev_low_level_set_gw(netdev, &ip_addr);
+    inet_aton(netmask, &ip_addr);
+    netdev_low_level_set_netmask(netdev, &ip_addr);
+    inet_aton(ip, &ip_addr);
+    netdev_low_level_set_ipaddr(netdev, &ip_addr);
+    sscanf(mac, "%x:%x:%x:%x:%x:%x",
+            &mac_addr[0], &mac_addr[1], &mac_addr[2], &mac_addr[3], &mac_addr[4], &mac_addr[5]);
+    for (num = 0; num < netdev->hwaddr_len; num++)
+    {
+        netdev->hwaddr[num] = mac_addr[num];
+    }
+
+    /* send dns server query commond "AT+CIPDNS?" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CIPDNS?") < 0)
+    {
+        LOG_W("please check and update %s device firmware to support the \"AT+CIPDNS?\" cmd.", device->name);
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args(resp, 1, resp_dns, dns_server1) <= 0 &&
+            at_resp_parse_line_args(resp, 2, resp_dns, dns_server2) <= 0)
+    {
+        LOG_E("%s device prase \"AT+CIPDNS?\" cmd error.", device->name);
+        goto __exit;
+    }
+
+    /* set primary DNS server address */
+    if (rt_strlen(dns_server1) > 0 &&
+            rt_strncmp(dns_server1, AT_ERR_DNS_SERVER, rt_strlen(AT_ERR_DNS_SERVER)) != 0)
+    {
+        inet_aton(dns_server1, &ip_addr);
+        netdev_low_level_set_dns_server(netdev, 0, &ip_addr);
+    }
+    else
+    {
+        inet_aton(AT_DEF_DNS_SERVER, &ip_addr);
+        esp32_netdev_set_dns_server(netdev, 0, &ip_addr);
+    }
+
+    /* set secondary DNS server address */
+    if (rt_strlen(dns_server2) > 0 )
+    {
+        inet_aton(dns_server2, &ip_addr);
+        netdev_low_level_set_dns_server(netdev, 1, &ip_addr);
+    }
+
+    /* send DHCP query commond " AT+CWDHCP_CUR?" and wait response */
+    if (at_obj_exec_cmd(client, resp, "AT+CWDHCP?") < 0)
+    {
+        goto __exit;
+    }
+
+    /* parse response data, get the DHCP status */
+    if (at_resp_parse_line_args_by_kw(resp, "+CWDHCP:", "+CWDHCP:%d", &dhcp_stat) < 0)
+    {
+        LOG_E("%s device prase DHCP status error.", device->name);
+        goto __exit;
+    }
+
+    /* Bit0 - SoftAP DHCP status, Bit1 - Station DHCP status */
+    netdev_low_level_set_dhcp_status(netdev, dhcp_stat & 0x01 ? RT_TRUE : RT_FALSE);
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+}
+
+static int esp32_net_init(struct at_device *device);
+
+static int esp32_netdev_set_up(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_FALSE)
+    {
+        esp32_net_init(device);
+        netdev_low_level_set_status(netdev, RT_TRUE);
+        LOG_D("network interface device(%s) set up status", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int esp32_netdev_set_down(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device by netdev(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_TRUE)
+    {
+        device->is_init = RT_FALSE;
+        netdev_low_level_set_status(netdev, RT_FALSE);
+        LOG_D("network interface device(%s) set down status", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int esp32_netdev_set_addr_info(struct netdev *netdev, ip_addr_t *ip_addr, ip_addr_t *netmask, ip_addr_t *gw)
+{
+#define IPADDR_RESP_SIZE       128
+#define IPADDR_SIZE            16
+
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char ip_str[IPADDR_SIZE] = {0};
+    char gw_str[IPADDR_SIZE] = {0};
+    char netmask_str[IPADDR_SIZE] = {0};
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(ip_addr || netmask || gw);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(IPADDR_RESP_SIZE, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* Convert numeric IP address into decimal dotted ASCII representation. */
+    if (ip_addr)
+        rt_memcpy(ip_str, inet_ntoa(*ip_addr), IPADDR_SIZE);
+    else
+        rt_memcpy(ip_str, inet_ntoa(netdev->ip_addr), IPADDR_SIZE);
+
+    if (gw)
+        rt_memcpy(gw_str, inet_ntoa(*gw), IPADDR_SIZE);
+    else
+        rt_memcpy(gw_str, inet_ntoa(netdev->gw), IPADDR_SIZE);
+
+    if (netmask)
+        rt_memcpy(netmask_str, inet_ntoa(*netmask), IPADDR_SIZE);
+    else
+        rt_memcpy(netmask_str, inet_ntoa(netdev->netmask), IPADDR_SIZE);
+
+    /* send addr info set commond "AT+CIPSTA_CUR=<ip>[,<gateway>,<netmask>]" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CIPSTA_CUR=\"%s\",\"%s\",\"%s\"",
+                        ip_str, gw_str, netmask_str) < 0)
+    {
+        LOG_E("%s device set address failed.", device->name);
+        result = -RT_ERROR;
+    }
+    else
+    {
+        /* Update netdev information */
+        if (ip_addr)
+            netdev_low_level_set_ipaddr(netdev, ip_addr);
+
+        if (gw)
+            netdev_low_level_set_gw(netdev, gw);
+
+        if (netmask)
+            netdev_low_level_set_netmask(netdev, netmask);
+
+        LOG_D("%s device set address success.", device->name);
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int esp32_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server)
+{
+#define DNS_RESP_SIZE           128
+
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(dns_server);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device by netdev(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(DNS_RESP_SIZE, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* send dns server set commond "AT+CIPDNS_CUR=<enable>[,<DNS	server0>,<DNS	server1>]" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CIPDNS_CUR=1,\"%s\"", inet_ntoa(*dns_server)) < 0)
+    {
+        LOG_E("%s device set DNS failed.", device->name);
+        result = -RT_ERROR;
+    }
+    else
+    {
+        netdev_low_level_set_dns_server(netdev, dns_num, dns_server);
+        LOG_D("%s device set DNS(%s) success.", device->name, inet_ntoa(*dns_server));
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int esp32_netdev_set_dhcp(struct netdev *netdev, rt_bool_t is_enabled)
+{
+#define ESP32_STATION     1
+#define RESP_SIZE           128
+
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device by netdev(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(RESP_SIZE, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp struct.");
+        return -RT_ENOMEM;
+    }
+
+    /* send dhcp set commond "AT+CWDHCP_CUR=<mode>,<en>" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CWDHCP_CUR=%d,%d", ESP32_STATION, is_enabled) < 0)
+    {
+        LOG_E("%s device set DHCP status(%d) failed.", device->name, is_enabled);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    else
+    {
+        netdev_low_level_set_dhcp_status(netdev, is_enabled);
+        LOG_D("%s device set DHCP status(%d) ok.", device->name, is_enabled);
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+#ifdef NETDEV_USING_PING
+static int esp32_netdev_ping(struct netdev *netdev, const char *host,
+                size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp)
+{
+#define ESP32_PING_IP_SIZE         16
+
+    rt_err_t result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char ip_addr[ESP32_PING_IP_SIZE] = {0};
+    int req_time;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(host);
+    RT_ASSERT(ping_resp);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(64, 0, timeout);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* send domain commond "AT+CIPDOMAIN=<domain name>" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CIPDOMAIN=\"%s\"", host) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    /* parse the third line of response data, get the IP address */
+    if (at_resp_parse_line_args_by_kw(resp, "+CIPDOMAIN:", "+CIPDOMAIN:%s", ip_addr) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    /* send ping commond "AT+PING=<IP>" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+PING=\"%s\"", host) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "+", "+PING:%d", &req_time) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (req_time)
+    {
+        inet_aton(ip_addr, &(ping_resp->ip_addr));
+        ping_resp->data_len = data_len;
+        ping_resp->ttl = 0;
+        ping_resp->ticks = req_time;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+#endif /* NETDEV_USING_PING */
+
+#ifdef NETDEV_USING_NETSTAT
+void esp32_netdev_netstat(struct netdev *netdev)
+{
+#define ESP32_NETSTAT_RESP_SIZE         320
+#define ESP32_NETSTAT_TYPE_SIZE         4
+#define ESP32_NETSTAT_IPADDR_SIZE       17
+#define ESP32_NETSTAT_EXPRESSION        "+CIPSTATUS:%*d,\"%[^\"]\",\"%[^\"]\",%d,%d,%*d"
+
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    int remote_port, local_port, i;
+    char *type = RT_NULL;
+    char *ipaddr = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return;
+    }
+
+    type = (char *) rt_calloc(1, ESP32_NETSTAT_TYPE_SIZE);
+    ipaddr = (char *) rt_calloc(1, ESP32_NETSTAT_IPADDR_SIZE);
+    if ((type && ipaddr) == RT_NULL)
+    {
+        LOG_E("no memory for ipaddr create.");
+        goto __exit;
+    }
+
+    resp = at_create_resp(ESP32_NETSTAT_RESP_SIZE, 0, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.", device->name);
+        goto __exit;
+    }
+
+    /* send network connection information commond "AT+CIPSTATUS" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CIPSTATUS") < 0)
+    {
+        goto __exit;
+    }
+
+    for (i = 1; i <= resp->line_counts; i++)
+    {
+        if (strstr(at_resp_get_line(resp, i), "+CIPSTATUS"))
+        {
+            /* parse the third line of response data, get the network connection information */
+            if (at_resp_parse_line_args(resp, i, ESP32_NETSTAT_EXPRESSION, type, ipaddr, &remote_port, &local_port) < 0)
+            {
+                goto __exit;
+            }
+            else
+            {
+                LOG_RAW("%s: %s:%d ==> %s:%d\n", type, inet_ntoa(netdev->ip_addr), local_port, ipaddr, remote_port);
+            }
+        }
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (type)
+    {
+        rt_free(type);
+    }
+
+    if (ipaddr)
+    {
+        rt_free(ipaddr);
+    }
+}
+#endif /* NETDEV_USING_NETSTAT */
+
+static const struct netdev_ops esp32_netdev_ops =
+{
+    esp32_netdev_set_up,
+    esp32_netdev_set_down,
+
+    esp32_netdev_set_addr_info,
+    esp32_netdev_set_dns_server,
+    esp32_netdev_set_dhcp,
+
+#ifdef NETDEV_USING_PING
+    esp32_netdev_ping,
+#endif
+#ifdef NETDEV_USING_NETSTAT
+    esp32_netdev_netstat,
+#endif
+};
+
+static struct netdev *esp32_netdev_add(const char *netdev_name)
+{
+#define ETHERNET_MTU        1500
+#define HWADDR_LEN          6
+    struct netdev *netdev = RT_NULL;
+
+    RT_ASSERT(netdev_name);
+
+    netdev = (struct netdev *) rt_calloc(1, sizeof(struct netdev));
+    if (netdev == RT_NULL)
+    {
+        LOG_E("no memory for netdev create.");
+        return RT_NULL;
+    }
+
+    netdev->mtu = ETHERNET_MTU;
+    netdev->ops = &esp32_netdev_ops;
+    netdev->hwaddr_len = HWADDR_LEN;
+
+#ifdef SAL_USING_AT
+    extern int sal_at_netdev_set_pf_info(struct netdev *netdev);
+    /* set the network interface socket/netdb operations */
+    sal_at_netdev_set_pf_info(netdev);
+#endif
+
+    netdev_register(netdev, netdev_name, RT_NULL);
+
+    return netdev;
+}
+
+/* =============================  esp32 device operations ============================= */
+
+#define AT_SEND_CMD(client, resp, cmd)                                     \
+    do {                                                                   \
+        (resp) = at_resp_set_info((resp), 256, 0, 5 * RT_TICK_PER_SECOND); \
+        if (at_obj_exec_cmd((client), (resp), (cmd)) < 0)                  \
+        {                                                                  \
+            result = -RT_ERROR;                                            \
+            goto __exit;                                                   \
+        }                                                                  \
+    } while(0)                                                             \
+
+static void esp32_netdev_start_delay_work(struct at_device *device)
+{
+    struct rt_delayed_work *net_work = RT_NULL;
+    net_work = (struct rt_delayed_work *)rt_calloc(1, sizeof(struct rt_delayed_work));
+    if (net_work == RT_NULL)
+    {
+        return;
+    }
+
+    rt_delayed_work_init(net_work, esp32_get_netdev_info, (void *)device);
+    rt_work_submit(&(net_work->work), RT_TICK_PER_SECOND);
+}
+
+static void esp32_init_thread_entry(void *parameter)
+{
+#define INIT_RETRY    5
+
+    struct at_device *device = (struct at_device *) parameter;
+    struct at_device_esp32 *esp32 = (struct at_device_esp32 *) device->user_data;
+    struct at_client *client = device->client;
+    at_response_t resp = RT_NULL;
+    rt_err_t result = RT_EOK;
+    rt_size_t i = 0, retry_num = INIT_RETRY;
+    rt_bool_t wifi_is_conn = RT_FALSE;
+
+    LOG_D("%s device initialize start.", device->name);
+
+    /* wait esp32 device startup finish */
+    if (at_client_obj_wait_connect(client, ESP32_WAIT_CONNECT_TIME))
+    {
+        return;
+    }
+
+    resp = at_create_resp(128, 0, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    while (retry_num--)
+    {
+        /* reset module */
+        AT_SEND_CMD(client, resp, "AT+RST");
+        /* reset waiting delay */
+        rt_thread_mdelay(1000);
+        /* disable echo */
+        AT_SEND_CMD(client, resp, "ATE0");
+        /* set current mode to Wi-Fi station */
+        AT_SEND_CMD(client, resp, "AT+CWMODE=1");
+        /* get module version */
+        AT_SEND_CMD(client, resp, "AT+GMR");
+        /* show module version */
+        for (i = 0; i < resp->line_counts - 1; i++)
+        {
+            LOG_D("%s", at_resp_get_line(resp, i + 1));
+        }
+
+        AT_SEND_CMD(client, resp, "AT+CIPMUX=1");
+
+        /* initialize successfully  */
+        result = RT_EOK;
+        break;
+
+    __exit:
+        if (result != RT_EOK)
+        {
+            rt_thread_mdelay(1000);
+            LOG_I("%s device initialize retry...", device->name);
+        }
+    }
+
+    /* connect to WiFi AP */
+    if (at_obj_exec_cmd(client, at_resp_set_info(resp, 512, 0, 20 * RT_TICK_PER_SECOND),
+                        "AT+CWJAP=\"%s\",\"%s\"", esp32->wifi_ssid, esp32->wifi_password) != RT_EOK)
+    {
+        LOG_W("%s device wifi connect failed, check ssid(%s) and password(%s).",
+              device->name, esp32->wifi_ssid, esp32->wifi_password);
+    }
+    else
+    {
+        wifi_is_conn = RT_TRUE;
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (result != RT_EOK)
+    {
+        netdev_low_level_set_status(device->netdev, RT_FALSE);
+        LOG_E("%s device network initialize failed(%d).", device->name, result);
+    }
+    else
+    {
+        device->is_init = RT_TRUE;
+        netdev_low_level_set_status(device->netdev, RT_TRUE);
+        if (wifi_is_conn)
+        {
+            netdev_low_level_set_link_status(device->netdev, RT_TRUE);
+        }
+        esp32_netdev_start_delay_work(device);
+        LOG_I("%s device network initialize successfully.", device->name);
+    }
+}
+
+static int esp32_net_init(struct at_device *device)
+{
+#ifdef AT_DEVICE_ESP32_INIT_ASYN
+    rt_thread_t tid;
+
+    tid = rt_thread_create("esp_net", esp32_init_thread_entry, (void *) device,
+            ESP32_THREAD_STACK_SIZE, ESP32_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("create %s device init thread failed.", device->name);
+        return -RT_ERROR;
+    }
+#else
+    esp32_init_thread_entry(device);
+#endif /* AT_DEVICE_ESP32_INIT_ASYN */
+
+    return RT_EOK;
+}
+
+static void urc_busy_p_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    LOG_D("system is processing a commands...");
+}
+
+static void urc_busy_s_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    LOG_D("system is sending data...");
+}
+
+static void urc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(client && data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    if (rt_strstr(data, "WIFI CONNECTED"))
+    {
+        LOG_I("%s device wifi is connected.", device->name);
+
+        if (device->is_init)
+        {
+            netdev_low_level_set_link_status(device->netdev, RT_TRUE);
+
+            esp32_netdev_start_delay_work(device);
+        }
+    }
+    else if (rt_strstr(data, "WIFI DISCONNECT"))
+    {
+        LOG_I("%s device wifi is disconnect.", device->name);
+
+        if (device->is_init)
+        {
+            netdev_low_level_set_link_status(device->netdev, RT_FALSE);
+        }
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"busy p",           "\r\n",           urc_busy_p_func},
+    {"busy s",           "\r\n",           urc_busy_s_func},
+    {"WIFI CONNECTED",   "\r\n",           urc_func},
+    {"WIFI DISCONNECT",  "\r\n",           urc_func},
+};
+
+static int esp32_init(struct at_device *device)
+{
+    struct at_device_esp32 *esp32 = (struct at_device_esp32 *) device->user_data;
+
+    /* initialize AT client */
+    at_client_init(esp32->client_name, esp32->recv_line_num);
+
+    device->client = at_client_get(esp32->client_name);
+    if (device->client == RT_NULL)
+    {
+        LOG_E("get AT client(%s) failed.", esp32->client_name);
+        return -RT_ERROR;
+    }
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+#ifdef AT_USING_SOCKET
+    esp32_socket_init(device);
+#endif
+
+    /* add esp32 device to the netdev list */
+    device->netdev = esp32_netdev_add(esp32->device_name);
+    if (device->netdev == RT_NULL)
+    {
+        LOG_E("add netdev(%s) failed.", esp32->device_name);
+        return -RT_ERROR;
+    }
+
+    /* initialize esp32 device network */
+    return esp32_netdev_set_up(device->netdev);
+}
+
+static int esp32_deinit(struct at_device *device)
+{
+    return esp32_netdev_set_down(device->netdev);
+}
+
+/* reset eap8266 device and initialize device network again */
+static int esp32_reset(struct at_device *device)
+{
+    int result = RT_EOK;
+    struct at_client *client = device->client;
+
+    /* send "AT+RST" commonds to esp32 device */
+    result = at_obj_exec_cmd(client, RT_NULL, "AT+RST");
+    rt_thread_mdelay(1000);
+
+    /* waiting 10 seconds for esp32 device reset */
+    device->is_init = RT_FALSE;
+    if (at_client_obj_wait_connect(client, ESP32_WAIT_CONNECT_TIME))
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    /* initialize esp32 device network */
+    esp32_net_init(device);
+
+    device->is_init = RT_TRUE;
+
+    return result;
+}
+
+/* change eap8266 wifi ssid and password information */
+static int esp32_wifi_info_set(struct at_device *device, struct at_device_ssid_pwd *info)
+{
+    int result = RT_EOK;
+    struct at_response *resp = RT_NULL;
+
+    if (info->ssid == RT_NULL || info->password == RT_NULL)
+    {
+        LOG_E("input wifi ssid(%s) and password(%s) error.", info->ssid, info->password);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 0, 20 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* connect to input wifi ap */
+    if (at_obj_exec_cmd(device->client, resp, "AT+CWJAP=\"%s\",\"%s\"", info->ssid, info->password) != RT_EOK)
+    {
+        LOG_E("%s device wifi connect failed, check ssid(%s) and password(%s).",
+              device->name, info->ssid, info->password);
+        result = -RT_ERROR;
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int esp32_control(struct at_device *device, int cmd, void *arg)
+{
+    int result = -RT_ERROR;
+
+    RT_ASSERT(device);
+
+    switch (cmd)
+    {
+    case AT_DEVICE_CTRL_POWER_ON:
+    case AT_DEVICE_CTRL_POWER_OFF:
+    case AT_DEVICE_CTRL_LOW_POWER:
+    case AT_DEVICE_CTRL_SLEEP:
+    case AT_DEVICE_CTRL_WAKEUP:
+    case AT_DEVICE_CTRL_NET_CONN:
+    case AT_DEVICE_CTRL_NET_DISCONN:
+    case AT_DEVICE_CTRL_GET_SIGNAL:
+    case AT_DEVICE_CTRL_GET_GPS:
+    case AT_DEVICE_CTRL_GET_VER:
+        LOG_W("not support the control cmd(%d).", cmd);
+        break;
+    case AT_DEVICE_CTRL_RESET:
+        result = esp32_reset(device);
+        break;
+    case AT_DEVICE_CTRL_SET_WIFI_INFO:
+        result = esp32_wifi_info_set(device, (struct at_device_ssid_pwd *) arg);
+        break;
+    default:
+        LOG_E("input error control cmd(%d).", cmd);
+        break;
+    }
+
+    return result;
+}
+
+static const struct at_device_ops esp32_device_ops =
+{
+    esp32_init,
+    esp32_deinit,
+    esp32_control,
+};
+
+static int esp32_device_class_register(void)
+{
+    struct at_device_class *class = RT_NULL;
+
+    class = (struct at_device_class *) rt_calloc(1, sizeof(struct at_device_class));
+    if (class == RT_NULL)
+    {
+        LOG_E("no memory for class create.");
+        return -RT_ENOMEM;
+    }
+
+    /* fill ESP32 device class object */
+#ifdef AT_USING_SOCKET
+    esp32_socket_class_register(class);
+#endif
+    class->device_ops = &esp32_device_ops;
+
+    return at_device_class_register(class, AT_DEVICE_CLASS_ESP32);
+}
+INIT_DEVICE_EXPORT(esp32_device_class_register);
+
+#endif /* AT_DEVICE_USING_ESP32 */

class/esp32/at_device_esp32.h

@@ -0,0 +1,66 @@
+/*
+ * File      : at_device_esp32.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-16     chenyong     first version
+ */
+
+#ifndef __AT_DEVICE_ESP32_H__
+#define __AT_DEVICE_ESP32_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the esp32 device */
+#define AT_DEVICE_ESP32_SOCKETS_NUM  5
+
+struct at_device_esp32
+{
+    char *device_name;
+    char *client_name;
+
+    char *wifi_ssid;
+    char *wifi_password;
+    size_t recv_line_num;
+    struct at_device device;
+
+    void *user_data;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* esp32 device socket initialize */
+int esp32_socket_init(struct at_device *device);
+
+/* esp32 device class socket register */
+int esp32_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_ESP32_H__ */

class/esp32/at_socket_esp32.c

@@ -0,0 +1,556 @@
+/*
+ * File      : at_socket_esp32.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-06-20     chenyong     first version
+ * 2019-05-09     chenyong     multi AT socket client support
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_esp32.h>
+
+#define LOG_TAG                       "at.skt.esp32"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_ESP32) && defined(AT_USING_SOCKET)
+
+#define ESP32_MODULE_SEND_MAX_SIZE   2048
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event)       (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define ESP32_EVENT_CONN_OK          (1L << 0)
+#define ESP32_EVENT_SEND_OK          (1L << 1)
+#define ESP32_EVENT_RECV_OK          (1L << 2)
+#define ESP32_EVNET_CLOSE_OK         (1L << 3)
+#define ESP32_EVENT_CONN_FAIL        (1L << 4)
+#define ESP32_EVENT_SEND_FAIL        (1L << 5)
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static int esp32_socket_event_send(struct at_device *device, uint32_t event)
+{
+    return (int) rt_event_send(device->socket_event, event);
+}
+
+static int esp32_socket_event_recv(struct at_device *device, uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = 0;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(device->socket_event, event, option | RT_EVENT_FLAG_CLEAR, timeout, &recved);
+    if (result != RT_EOK)
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    return recved;
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int esp32_socket_close(struct at_socket *socket)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    result = at_obj_exec_cmd(device->client, resp, "AT+CIPCLOSE=%d", device_socket);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int esp32_socket_connect(struct at_socket *socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
+{
+    int result = RT_EOK;
+    rt_bool_t retryed = RT_FALSE;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    resp = at_create_resp(128, 0, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+__retry:
+    if (is_client)
+    {
+        switch (type)
+        {
+        case AT_SOCKET_TCP:
+            /* send AT commands to connect TCP server */
+            if (at_obj_exec_cmd(device->client, resp,
+                                "AT+CIPSTART=%d,\"TCP\",\"%s\",%d,60", device_socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+            }
+            break;
+
+        case AT_SOCKET_UDP:
+            if (at_obj_exec_cmd(device->client, resp,
+                                "AT+CIPSTART=%d,\"UDP\",\"%s\",%d", device_socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+            }
+            break;
+
+        default:
+            LOG_E("not supported connect type %d.", type);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+    }
+
+    if (result != RT_EOK && retryed == RT_FALSE)
+    {
+        LOG_D("%s device socket (%d) connect failed, the socket was not be closed and now will connect retry.",
+                device->name, device_socket);
+        if (esp32_socket_close(socket) < 0)
+        {
+            goto __exit;
+        }
+        retryed = RT_TRUE;
+        result = RT_EOK;
+        goto __retry;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int esp32_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    int result = RT_EOK;
+    int event_result = 0;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    struct at_device_esp32 *esp32 = (struct at_device_esp32 *) device->user_data;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+    RT_ASSERT(bfsz > 0);
+
+    resp = at_create_resp(128, 2, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* set current socket for send URC event */
+    esp32->user_data = (void *) device_socket;
+
+    /* set AT client end sign to deal with '>' sign */
+    at_obj_set_end_sign(device->client, '>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < ESP32_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = ESP32_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+CIPSEND" commands to AT server than receive the '>' response on the first line */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CIPSEND=%d,%d", device_socket, cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* waiting result event from AT URC */
+        if (esp32_socket_event_recv(device, SET_EVENT(device_socket, 0),
+                                      10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect result timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* waiting OK or failed result */
+        event_result = esp32_socket_event_recv(device, ESP32_EVENT_SEND_OK | ESP32_EVENT_SEND_FAIL,
+                                                 5 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait connect OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* check result */
+        if (event_result & ESP32_EVENT_SEND_FAIL)
+        {
+            LOG_E("%s device socket(%d) send failed.", device->name, device_socket);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result > 0 ? sent_size : result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int esp32_domain_resolve(const char *name, char ip[16])
+{
+#define RESOLVE_RETRY        5
+
+    int i, result = RT_EOK;
+    char recv_ip[16] = { 0 };
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first init device failed.");
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 0, 20 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    for (i = 0; i < RESOLVE_RETRY; i++)
+    {
+        if (at_obj_exec_cmd(device->client, resp, "AT+CIPDOMAIN=\"%s\"", name) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* parse the third line of response data, get the IP address */
+        if (at_resp_parse_line_args_by_kw(resp, "+CIPDOMAIN:", "+CIPDOMAIN:%s", recv_ip) < 0)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+
+        if (rt_strlen(recv_ip) < 8)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+        else
+        {
+            rt_strncpy(ip, recv_ip, 15);
+            ip[15] = '\0';
+            break;
+        }
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void esp32_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static const struct at_socket_ops esp32_socket_ops =
+{
+    esp32_socket_connect,
+    esp32_socket_close,
+    esp32_socket_send,
+    esp32_domain_resolve,
+    esp32_socket_set_event_cb,
+};
+
+static void urc_send_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    struct at_device_esp32 *esp32 = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+    esp32 = (struct at_device_esp32 *) device->user_data;
+    device_socket = (int) esp32->user_data;
+
+    if (rt_strstr(data, "SEND OK"))
+    {
+        esp32_socket_event_send(device, SET_EVENT(device_socket, ESP32_EVENT_SEND_OK));
+    }
+    else if (rt_strstr(data, "SEND FAIL"))
+    {
+        esp32_socket_event_send(device, SET_EVENT(device_socket, ESP32_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_send_bfsz_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    static int cur_send_bfsz = 0;
+
+    RT_ASSERT(data && size);
+
+    sscanf(data, "Recv %d bytes", &cur_send_bfsz);
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int index = 0;
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "%d,CLOSED", &index);
+    socket = &(device->sockets[index]);
+
+    /* notice the socket is disconnect by remote */
+    if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, RT_NULL, 0);
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout = 0;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the at deveice socket and receive buffer size by receive data */
+    sscanf(data, "+IPD,%d,%d:", &device_socket, (int *) &bfsz);
+
+    /* set receive timeout by receive buffer length, not less than 10ms */
+    timeout = bfsz > 10 ? bfsz : 10;
+
+    if (device_socket < 0 || bfsz == 0)
+        return;
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory receive buffer(%d).", bfsz);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("%s device receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"SEND OK",          "\r\n",           urc_send_func},
+    {"SEND FAIL",        "\r\n",           urc_send_func},
+    {"Recv",             "bytes\r\n",      urc_send_bfsz_func},
+    {"",                 ",CLOSED\r\n",    urc_close_func},
+    {"+IPD",             ":",              urc_recv_func},
+};
+
+int esp32_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int esp32_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_ESP32_SOCKETS_NUM;
+    class->socket_ops = &esp32_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_ESP32 && AT_USING_SOCKET */

class/esp8266/at_device_esp8266.c

@@ -57,7 +57,7 @@ static void esp8266_get_netdev_info(struct rt_work *work, void *work_data)
     ip_addr_t ip_addr;
     rt_uint32_t mac_addr[6] = {0};
     rt_uint32_t num = 0;
-    rt_uint8_t dhcp_stat = 0;
+    rt_uint32_t dhcp_stat = 0;
     struct rt_delayed_work *delay_work = (struct rt_delayed_work *)work;
     struct at_device *device = (struct at_device *)work_data;
     struct netdev *netdev = device->netdev;

class/m26/at_device_m26.c

@@ -294,7 +294,7 @@ static int m26_netdev_check_link_status(struct netdev *netdev)
 
     RT_ASSERT(netdev);
 
-    rt_snprintf(tname, RT_NAME_MAX, "%s_link", netdev->name);
+    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);
 
     tid = rt_thread_create(tname, check_link_status_entry, (void *)netdev,
                            M26_LINK_THREAD_STACK_SIZE, M26_LINK_THREAD_PRIORITY, M26_LINK_THREAD_TICK);
@@ -707,7 +707,11 @@ static void m26_init_thread_entry(void *parameter)
     if (result == RT_EOK)
     {
         m26_netdev_set_info(device->netdev);
-        m26_netdev_check_link_status(device->netdev);
+        /* check and create link staus sync thread  */
+        if (rt_thread_find(device->netdev->name) == RT_NULL)
+        {
+            m26_netdev_check_link_status(device->netdev);
+        }
 
         LOG_I("%s device network initialize success.", device->name);
     }

class/m26/at_socket_m26.c

@@ -84,21 +84,13 @@ static int m26_socket_event_recv(struct at_device *device, uint32_t event, uint3
 static int m26_socket_close(struct at_socket *socket)
 {
     int result = 0;
-    at_response_t resp = RT_NULL;
     int device_socke = (int) socket->user_data;
     struct at_device *device  = (struct at_device *) socket->device;
     
-    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
-    if (resp == RT_NULL)
-    {
-        LOG_E("no memory for resp create.", device->name);
-        return -RT_ENOMEM;
-    }
-
     /* clear socket close event */
     m26_socket_event_recv(device, SET_EVENT(device_socke, M26_EVNET_CLOSE_OK), 0, RT_EVENT_FLAG_OR);
 
-    if (at_obj_exec_cmd(device->client, resp, "AT+QICLOSE=%d", device_socke) < 0)
+    if (at_obj_exec_cmd(device->client, NULL, "AT+QICLOSE=%d", device_socke) < 0)
     {
         result = -RT_ERROR;
         goto __exit;
@@ -113,11 +105,6 @@ static int m26_socket_close(struct at_socket *socket)
     }
 
 __exit:
-    if (resp)
-    {
-        at_delete_resp(resp);
-    }
-
     return result;
 }
 

class/m6315/at_device_m6315.c

@@ -0,0 +1,969 @@
+/*
+ * File      : at_socket_m6315.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-06-12     malongwei    first version
+ * 2019-05-13     chenyong     multi AT socket client support
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <at_device_m6315.h>
+
+#define LOG_TAG                        "at.dev.m6315"
+#include <at_log.h>
+
+#ifdef AT_DEVICE_USING_M6315
+
+#define M6315_WAIT_CONNECT_TIME      5000
+#define M6315_THREAD_STACK_SIZE      2048
+#define M6315_THREAD_PRIORITY        (RT_THREAD_PRIORITY_MAX/2)
+
+
+static void m6315_power_on(struct at_device *device)
+{
+    struct at_device_m6315 *m6315 = RT_NULL;
+
+    m6315 = (struct at_device_m6315 *) device->user_data;
+
+    /* not nead to set pin configuration for m26 device power on */
+    if (m6315->power_pin == -1 || m6315->power_status_pin == -1)
+    {
+        return;
+    }
+
+    if (rt_pin_read(m6315->power_status_pin) == PIN_HIGH)
+    {
+        return;
+    }
+    rt_pin_write(m6315->power_pin, PIN_HIGH);
+
+    while (rt_pin_read(m6315->power_status_pin) == PIN_LOW)
+    {
+        rt_thread_mdelay(10);
+    }
+    rt_pin_write(m6315->power_pin, PIN_LOW);
+}
+
+static void m6315_power_off(struct at_device *device)
+{
+    struct at_device_m6315 *m6315 = RT_NULL;
+
+    m6315 = (struct at_device_m6315 *) device->user_data;
+
+    /* not nead to set pin configuration for m6315 device power on */
+    if (m6315->power_pin == -1 || m6315->power_status_pin == -1)
+    {
+        return;
+    }
+
+    if (rt_pin_read(m6315->power_status_pin) == PIN_LOW)
+    {
+        return;
+    }
+    rt_pin_write(m6315->power_pin, PIN_HIGH);
+
+    while (rt_pin_read(m6315->power_status_pin) == PIN_HIGH)
+    {
+        rt_thread_mdelay(10);
+    }
+    rt_pin_write(m6315->power_pin, PIN_LOW);
+}
+
+/* =============================  m6315 network interface operations ============================= */
+
+/* set m6315 network interface device status and address information */
+static int m6315_netdev_set_info(struct netdev *netdev)
+{
+#define M6315_IMEI_RESP_SIZE      32
+#define M6315_IPADDR_RESP_SIZE    32
+#define M6315_DNS_RESP_SIZE       96
+#define M6315_INFO_RESP_TIMO      rt_tick_from_millisecond(300)
+
+    int result = RT_EOK;
+    ip_addr_t addr;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.");
+        return -RT_ERROR;
+    }
+
+    /* set network interface device status */
+    netdev_low_level_set_status(netdev, RT_TRUE);
+    netdev_low_level_set_link_status(netdev, RT_TRUE);
+    netdev_low_level_set_dhcp_status(netdev, RT_TRUE);
+
+    resp = at_create_resp(M6315_IMEI_RESP_SIZE, 0, M6315_INFO_RESP_TIMO);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* set network interface device hardware address(IMEI) */
+    {
+        #define M6315_NETDEV_HWADDR_LEN   8
+        #define M6315_IMEI_LEN            15
+
+        char imei[M6315_IMEI_LEN] = {0};
+        int i = 0, j = 0;
+
+        /* send "AT+GSN" commond to get device IMEI */
+        if (at_obj_exec_cmd(device->client, resp, "AT+GSN") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_parse_line_args(resp, 2, "%s", imei) <= 0)
+        {
+            LOG_E("%s device prase \"AT+GSN\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("%s device IMEI number: %s", device->name, imei);
+
+        netdev->hwaddr_len = M6315_NETDEV_HWADDR_LEN;
+        /* get hardware address by IMEI */
+        for (i = 0, j = 0; i < M6315_NETDEV_HWADDR_LEN && j < M6315_IMEI_LEN; i++, j += 2)
+        {
+            if (j != M6315_IMEI_LEN - 1)
+            {
+                netdev->hwaddr[i] = (imei[j] - '0') * 10 + (imei[j + 1] - '0');
+            }
+            else
+            {
+                netdev->hwaddr[i] = (imei[j] - '0');
+            }
+        }
+    }
+
+    /* set network interface device IP address */
+    {
+        #define IP_ADDR_SIZE_MAX    16
+        char ipaddr[IP_ADDR_SIZE_MAX] = {0};
+
+        at_resp_set_info(resp, M6315_IPADDR_RESP_SIZE, 2, M6315_INFO_RESP_TIMO);
+
+        /* send "AT+QILOCIP" commond to get IP address */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QILOCIP") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_parse_line_args_by_kw(resp, ".", "%s", ipaddr) <= 0)
+        {
+            LOG_E("%s device prase \"AT+QILOCIP\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("%s device IP address: %s", device->name, ipaddr);
+
+        /* set network interface address information */
+        inet_aton(ipaddr, &addr);
+        netdev_low_level_set_ipaddr(netdev, &addr);
+    }
+
+    /* set network interface device dns server */
+    {
+        #define DNS_ADDR_SIZE_MAX   16
+        char dns_server1[DNS_ADDR_SIZE_MAX] = {0}, dns_server2[DNS_ADDR_SIZE_MAX] = {0};
+
+        at_resp_set_info(resp, M6315_DNS_RESP_SIZE, 0, M6315_INFO_RESP_TIMO);
+
+        /* send "AT+QIDNSCFG?" commond to get DNS servers address */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QIDNSCFG?") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_parse_line_args_by_kw(resp, "PrimaryDns:", "PrimaryDns:%s", dns_server1) <= 0 ||
+            at_resp_parse_line_args_by_kw(resp, "SecondaryDns:", "SecondaryDns:%s", dns_server2) <= 0)
+        {
+            LOG_E("%s device prase \"AT+QIDNSCFG?\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("%s device primary DNS server address: %s", device->name, dns_server1);
+        LOG_D("%s device secondary DNS server address: %s", device->name, dns_server2);
+
+        inet_aton(dns_server1, &addr);
+        netdev_low_level_set_dns_server(netdev, 0, &addr);
+
+        inet_aton(dns_server2, &addr);
+        netdev_low_level_set_dns_server(netdev, 1, &addr);
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static void check_link_status_entry(void *parameter)
+{
+#define M6315_LINK_STATUS_OK   1
+#define M6315_LINK_RESP_SIZE   64
+#define M6315_LINK_RESP_TIMO   (3 * RT_TICK_PER_SECOND)
+#define M6315_LINK_DELAY_TIME  (30 * RT_TICK_PER_SECOND)
+
+    at_response_t resp = RT_NULL;
+    int result_code, link_status;
+    struct at_device *device = RT_NULL;
+    struct netdev *netdev = (struct netdev *)parameter;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return;
+    }
+
+    resp = at_create_resp(M6315_LINK_RESP_SIZE, 0, M6315_LINK_RESP_TIMO);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    while (1)
+    {
+        /* send "AT+CGREG?" commond  to check netweork interface device link status */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CGREG?") < 0)
+        {
+            rt_thread_mdelay(M6315_LINK_DELAY_TIME);
+
+            continue;
+        }
+
+        link_status = -1;
+        at_resp_parse_line_args_by_kw(resp, "+CGREG:", "+CGREG: %d,%d", &result_code, &link_status);
+
+        /* check the network interface device link status  */
+        if ((M6315_LINK_STATUS_OK == link_status) != netdev_is_link_up(netdev))
+        {
+            netdev_low_level_set_link_status(netdev, (M6315_LINK_STATUS_OK == link_status));
+        }
+
+        rt_thread_mdelay(M6315_LINK_DELAY_TIME);
+    }
+}
+
+static int m6315_netdev_check_link_status(struct netdev *netdev)
+{
+#define M6315_LINK_THREAD_TICK           20
+#define M6315_LINK_THREAD_STACK_SIZE     (1024 + 512)
+#define M6315_LINK_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX - 2)
+
+    rt_thread_t tid;
+    char tname[RT_NAME_MAX] = {0};
+
+    RT_ASSERT(netdev);
+
+    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);
+
+    tid = rt_thread_create(tname, check_link_status_entry, (void *) netdev,
+            M6315_LINK_THREAD_STACK_SIZE, M6315_LINK_THREAD_PRIORITY, M6315_LINK_THREAD_TICK);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+
+    return RT_EOK;
+}
+
+static int m6315_net_init(struct at_device *device);
+
+static int m6315_netdev_set_up(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_FALSE)
+    {
+        m6315_net_init(device);
+        device->is_init = RT_TRUE;
+
+        netdev_low_level_set_status(netdev, RT_TRUE);
+        LOG_D("network interface device(%s) set up status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int m6315_netdev_set_down(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_TRUE)
+    {
+        m6315_power_off(device);
+        device->is_init = RT_FALSE;
+
+        netdev_low_level_set_status(netdev, RT_FALSE);
+        LOG_D("network interface device(%s) set down status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int m6315_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server)
+{
+#define M6315_DNS_RESP_LEN     8
+#define M6315_DNS_RESP_TIMEO   rt_tick_from_millisecond(300)
+
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(dns_server);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(M6315_DNS_RESP_LEN, 0, M6315_DNS_RESP_TIMEO);
+    if (resp == RT_NULL)
+    {
+        LOG_D("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* send "AT+QIDNSCFG=<pri_dns>[,<sec_dns>]" commond to set dns servers */
+    if (at_obj_exec_cmd(device->client, resp, "AT+QIDNSCFG=\"%s\"", inet_ntoa(*dns_server)) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    netdev_low_level_set_dns_server(netdev, dns_num, dns_server);
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+
+#ifdef NETDEV_USING_PING
+static int m6315_netdev_ping(struct netdev *netdev, const char *host,
+        size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp)
+{
+#define M6315_PING_RESP_SIZE         128
+#define M6315_PING_IP_SIZE           16
+#define M6315_PING_TIMEO             (5 * RT_TICK_PER_SECOND)
+    int result = -RT_ERROR;
+    int response, time, ttl, bytes;
+    char ip_addr[M6315_PING_IP_SIZE] = {0};
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    int sent, recv, lost, min, max, avg;
+		
+    RT_ASSERT(netdev);
+    RT_ASSERT(host);
+    RT_ASSERT(ping_resp);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    /* Response line number set six because no \r\nOK\r\n at the end*/
+    resp = at_create_resp(M6315_PING_RESP_SIZE, 6, M6315_PING_TIMEO);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    /* send "AT+QPING="<host>"[,[<timeout>][,<pingnum>]]" timeout:1-255 second, pingnum:1-10, commond to send ping request */
+    at_obj_exec_cmd(device->client, resp, "AT+QPING= \"%s\", 100, 1", host);
+    sscanf(at_resp_get_line_by_kw(resp, "+QPING:"), "+QPING:%d,%*s", &response);
+    switch (response)
+    {
+    case 0:
+        if (at_resp_parse_line_args(resp, 4, "+QPING: %d, %[^,], %d, %d, %d",
+            &response, ip_addr, &bytes, &time, &ttl) != RT_NULL) 
+        {
+            /* ping result reponse at the sixth line */
+            if (at_resp_parse_line_args(resp, 6, "+QPING: %d, %d, %d, %d, %d, %d, %d",
+                 &response, &sent, &recv, &lost, &min, &max, &avg) != RT_NULL) 
+            {
+                // ping result 2
+                if (response == 2)  
+                {
+                    inet_aton(ip_addr, &(ping_resp->ip_addr));
+                    ping_resp->data_len = bytes;
+                    ping_resp->ticks = time;
+                    ping_resp->ttl = ttl;
+                    result = RT_EOK;
+                }
+            }
+        }
+        break;
+    case 1:
+        LOG_E("%s device Ping request timeout.", device->name);
+        break;
+    case 3:
+        LOG_E("%s device TCP/IP stack is busy.", device->name);
+        break;
+    case 4:
+        LOG_E("%s device Remote server not found.", device->name);
+        break;
+    case 5:
+        LOG_E("%s device Activate PDP context failed.", device->name);
+        break;
+    default:
+        break;
+    }    
+
+
+ __exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+#endif /* NETDEV_USING_PING */
+
+const struct netdev_ops m6315_netdev_ops =
+{
+    m6315_netdev_set_up,
+    m6315_netdev_set_down,
+
+    RT_NULL, /* not support set ip, netmask, gatway address */
+    m6315_netdev_set_dns_server,
+    RT_NULL, /* not support set DHCP status */
+
+#ifdef NETDEV_USING_PING
+    m6315_netdev_ping,
+#endif
+    RT_NULL,
+};
+
+static struct netdev *m6315_netdev_add(const char *netdev_name)
+{
+#define M6315_NETDEV_MTU       1500
+    struct netdev *netdev = RT_NULL;
+
+    RT_ASSERT(netdev_name);
+
+    netdev = (struct netdev *) rt_calloc(1, sizeof(struct netdev));
+    if (netdev == RT_NULL)
+    {
+        LOG_E("no memory for netdev create.");
+        return RT_NULL;
+    }
+
+    netdev->mtu = M6315_NETDEV_MTU;
+    netdev->ops = &m6315_netdev_ops;
+
+#ifdef SAL_USING_AT
+    extern int sal_at_netdev_set_pf_info(struct netdev *netdev);
+    /* set the network interface socket/netdb operations */
+    sal_at_netdev_set_pf_info(netdev);
+#endif
+
+    netdev_register(netdev, netdev_name, RT_NULL);
+
+    return netdev;
+}
+
+/* =============================  m6315 device operations ============================= */
+
+#define AT_SEND_CMD(client, resp, resp_line, timeout, cmd)                                         \
+    do {                                                                                           \
+        (resp) = at_resp_set_info((resp), 128, (resp_line), rt_tick_from_millisecond(timeout));    \
+        if (at_obj_exec_cmd((client), (resp), (cmd)) < 0)                                          \
+        {                                                                                          \
+            result = -RT_ERROR;                                                                    \
+            goto __exit;                                                                           \
+        }                                                                                          \
+    } while(0)                                                                                     \
+
+/* init for m6315 */
+static void m6315_init_thread_entry(void *parameter)
+{
+#define INIT_RETRY                     5
+#define CPIN_RETRY                     10
+#define CSQ_RETRY                      10
+#define CREG_RETRY                     10
+#define CGREG_RETRY                    20
+#define CGATT_RETRY                    10
+#define IPADDR_RETRY                   10
+#define COMMON_RETRY                   10
+
+    int i, qimux, retry_num = INIT_RETRY;
+    char parsed_data[10] = {0};
+    rt_err_t result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = (struct at_device *)parameter;
+    struct at_client *client = device->client;
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(500));   
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    LOG_D("start init %s device", device->name);
+
+    while (retry_num--)
+    {
+        rt_memset(parsed_data, 0, sizeof(parsed_data));
+        rt_thread_mdelay(500);
+        m6315_power_on(device);
+        rt_thread_mdelay(1000);
+
+        /* wait m6315 startup finish */
+        if (at_client_obj_wait_connect(client, M6315_WAIT_CONNECT_TIME))
+        {
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+								
+        /* disable echo */
+        AT_SEND_CMD(client, resp, 0, 300, "ATE0");
+        /* get module version */
+        AT_SEND_CMD(client, resp, 0, 300, "ATI");
+        /* show module version */
+        for (i = 0; i < (int)resp->line_counts - 1; i++)
+        {
+            LOG_D("%s", at_resp_get_line(resp, i + 1));
+        }
+        /* check SIM card */
+        for (i = 0; i < CPIN_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 2, 5 * RT_TICK_PER_SECOND, "AT+CPIN?");
+
+            if (at_resp_get_line_by_kw(resp, "READY"))
+            {
+                LOG_D("%s device SIM card detection success.", device->name);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == CPIN_RETRY)
+        {
+            LOG_E("%s device SIM card detection failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        /* waiting for dirty data to be digested */
+        rt_thread_mdelay(10);
+
+        /* check the GSM network is registered */
+        for (i = 0; i < CREG_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, "AT+CREG?");
+            at_resp_parse_line_args_by_kw(resp, "+CREG:", "+CREG: %s", &parsed_data);
+            if (!strncmp(parsed_data, "0,1", strlen(parsed_data)) ||
+                !strncmp(parsed_data, "0,5", strlen(parsed_data)))
+            {
+                LOG_D("%s device GSM is registered(%s),", device->name, parsed_data);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == CREG_RETRY)
+        {
+            LOG_E("%s device GSM is register failed(%s).", device->name, parsed_data);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+
+        /* check packet domain attach or detach */
+        for (i = 0; i < CGATT_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, "AT+CGATT?");
+            at_resp_parse_line_args_by_kw(resp, "+CGATT:", "+CGATT: %s", &parsed_data);
+            if (!strncmp(parsed_data, "1", 1))
+            {
+                LOG_D("%s device Packet domain attach.", device->name);
+                break;
+            }
+
+            rt_thread_mdelay(1000);
+        }
+        if (i == CGATT_RETRY)
+        {
+            LOG_E("%s device GPRS attach failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* Define PDP Context */
+        for (i = 0; i < COMMON_RETRY; i++)
+        {            
+            if (at_obj_exec_cmd(device->client, resp, "AT+CGDCONT=1,\"IP\",\"CMNET\"") == RT_EOK)
+            {
+                LOG_D("%s device Define PDP Context Success.", device->name);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == COMMON_RETRY)
+        {
+            LOG_E("%s device Define PDP Context failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* PDP Context Activate*/
+        for (i = 0; i < COMMON_RETRY; i++)
+        {            
+            if (at_obj_exec_cmd(device->client, resp, "AT+CGACT=1,1") == RT_EOK)
+            {
+                LOG_D("%s device PDP Context Activate Success.", device->name);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == COMMON_RETRY)
+        {
+            LOG_E("%s device PDP Context Activate failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* check the GPRS network is registered */
+        for (i = 0; i < CGREG_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, "AT+CGREG?");
+            at_resp_parse_line_args_by_kw(resp, "+CGREG:", "+CGREG: %s", &parsed_data);
+            if (!strncmp(parsed_data, "0,1", strlen(parsed_data)) ||
+                !strncmp(parsed_data, "0,5", strlen(parsed_data)))
+            {
+                LOG_D("%s device GPRS is registered(%s).", device->name, parsed_data);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == CGREG_RETRY)
+        {
+            LOG_E("%s device GPRS is register failed(%s).", device->name, parsed_data);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* check signal strength */
+        for (i = 0; i < CSQ_RETRY; i++)
+        {
+            AT_SEND_CMD(client, resp, 2, 300, "AT+CSQ");
+            at_resp_parse_line_args_by_kw(resp, "+CSQ:", "+CSQ: %s", &parsed_data);
+            if (strncmp(parsed_data, "99,99", strlen(parsed_data)))
+            {
+                LOG_D("%s device signal strength: %s", device->name, parsed_data);
+                break;
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == CSQ_RETRY)
+        {
+            LOG_E("%s device signal strength check failed (%s)", device->name, parsed_data);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* check the GPRS network IP address */
+        for (i = 0; i < IPADDR_RETRY; i++)
+        {            
+            if (at_obj_exec_cmd(device->client, resp, "AT+CGPADDR=1") == RT_EOK)
+            {
+                #define IP_ADDR_SIZE_MAX    16
+                char ipaddr[IP_ADDR_SIZE_MAX] = {0};
+                
+                /* parse response data "+CGPADDR: 1,<IP_address>" */
+                if (at_resp_parse_line_args_by_kw(resp, "+CGPADDR:", "+CGPADDR: %*d,%s", ipaddr) > 0)
+                {
+                    LOG_D("%s device IP address: %s", device->name, ipaddr);
+                    break;
+                }
+            }
+            rt_thread_mdelay(1000);
+        }
+        if (i == IPADDR_RETRY)
+        {
+            LOG_E("%s device GPRS is get IP address failed", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* Set to multiple connections */
+        AT_SEND_CMD(client, resp, 0, 300, "AT+QIMUX?");
+        at_resp_parse_line_args_by_kw(resp, "+QIMUX:", "+QIMUX: %d", &qimux);
+        if (qimux == 0)
+        {
+            AT_SEND_CMD(client, resp, 0, 300, "AT+QIMUX=1");
+        }
+        else if (qimux == 1)
+        {
+            /* Close Already Opened GPRS/CSD PDP*/                         
+            AT_SEND_CMD(device->client, resp, 2, 300, "AT+QIDEACT");
+            if (at_resp_get_line_by_kw(resp, "DEACT OK") == RT_NULL)
+            {
+                LOG_E("%s device prase \"AT+QIDEACT\" cmd error.", device->name);
+                result = -RT_ERROR;
+                goto __exit;
+            }                   
+        }
+        
+        /* Start task & set entry point default apn,username,password */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QIREGAPP") < 0)
+        {
+            LOG_E("%s device Start task & set default params failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;            
+        }
+
+        /* PDP Context Activate */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QIACT") < 0)
+        {
+            LOG_E("%s device PDP Context Activate failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }          
+
+        /* initialize successfully  */
+        result = RT_EOK;
+        break;
+
+    __exit:
+        if (result != RT_EOK)
+        {
+            /* power off the m6315 device */
+            m6315_power_off(device);
+            rt_thread_mdelay(1000);
+
+            LOG_I("%s device initialize retry...", device->name);
+        }
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (result == RT_EOK)
+    {
+        /* set network interface device status and address information */
+        m6315_netdev_set_info(device->netdev);
+        /* check and create link staus sync thread  */
+        if (rt_thread_find(device->netdev->name) == RT_NULL)
+        {
+            m6315_netdev_check_link_status(device->netdev);
+        }
+
+        LOG_I("%s device network initialize success!", device->name);
+
+    }
+    else
+    {
+        LOG_E("%s device network initialize failed(%d)!", device->name, result);
+    }
+}
+
+static int m6315_net_init(struct at_device *device)
+{
+#ifdef AT_DEVICE_M6315_INIT_ASYN
+    rt_thread_t tid;
+
+    tid = rt_thread_create("m6315_net", m6315_init_thread_entry, (void *)device,
+                M6315_THREAD_STACK_SIZE, M6315_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("create %s device init thread failed.", device->name);
+        return -RT_ERROR;
+    }
+#else
+    m6315_init_thread_entry(device);
+#endif /* AT_DEVICE_M6315_INIT_ASYN */
+
+    return RT_EOK;
+}
+
+static void urc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    RT_ASSERT(data);
+
+    LOG_I("URC data : %.*s", size, data);
+}
+
+
+/* m6315 device URC table for the device control */
+static const struct at_urc urc_table[] =
+{
+    {"RDY",         "\r\n",                 urc_func},
+    {"+PDP DEACT",  "\r\n",                 urc_func},
+};
+
+static int m6315_init(struct at_device *device)
+{
+    struct at_device_m6315 *m6315 = (struct at_device_m6315 *) device->user_data;
+
+    /* initialize AT client */
+    at_client_init(m6315->client_name, m6315->recv_line_num);
+
+    device->client = at_client_get(m6315->client_name);
+    if (device->client == RT_NULL)
+    {
+        LOG_E("get AT client(%s) failed.", m6315->client_name);
+        return -RT_ERROR;
+    }
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+#ifdef AT_USING_SOCKET
+    m6315_socket_init(device);
+#endif
+
+    /* add m6315 device to the netdev list */
+    device->netdev = m6315_netdev_add(m6315->device_name);
+    if (device->netdev == RT_NULL)
+    {
+        LOG_E("get netdev(%s) failed.", m6315->device_name);
+        return -RT_ERROR;
+    }
+
+    /* initialize m6315 pin configuration */
+    if (m6315->power_pin != -1 && m6315->power_status_pin != -1)
+    {
+        rt_pin_mode(m6315->power_pin, PIN_MODE_OUTPUT);
+        rt_pin_mode(m6315->power_status_pin, PIN_MODE_INPUT);
+    }
+
+    /* initialize m6315 device network */
+    return m6315_netdev_set_up(device->netdev);
+}
+
+static int m6315_deinit(struct at_device *device)
+{
+    return m6315_netdev_set_down(device->netdev);
+}
+
+static int m6315_control(struct at_device *device, int cmd, void *arg)
+{
+    int result = -RT_ERROR;
+
+    RT_ASSERT(device);
+
+    switch (cmd)
+    {
+    case AT_DEVICE_CTRL_POWER_ON:
+    case AT_DEVICE_CTRL_POWER_OFF:
+    case AT_DEVICE_CTRL_RESET:
+    case AT_DEVICE_CTRL_LOW_POWER:
+    case AT_DEVICE_CTRL_SLEEP:
+    case AT_DEVICE_CTRL_WAKEUP:
+    case AT_DEVICE_CTRL_NET_CONN:
+    case AT_DEVICE_CTRL_NET_DISCONN:
+    case AT_DEVICE_CTRL_SET_WIFI_INFO:
+    case AT_DEVICE_CTRL_GET_SIGNAL:
+    case AT_DEVICE_CTRL_GET_GPS:
+    case AT_DEVICE_CTRL_GET_VER:
+        LOG_W("not support the control command(%d).", cmd);
+        break;
+    default:
+        LOG_E("input error control command(%d).", cmd);
+        break;
+    }
+
+    return result;
+}
+
+const struct at_device_ops m6315_device_ops =
+{
+    m6315_init,
+    m6315_deinit,
+    m6315_control,
+};
+
+static int m6315_device_class_register(void)
+{
+    struct at_device_class *class = RT_NULL;
+
+    class = (struct at_device_class *) rt_calloc(1, sizeof(struct at_device_class));
+    if (class == RT_NULL)
+    {
+        LOG_E("no memory for device class create.");
+        return -RT_ENOMEM;
+    }
+
+    /* fill m6315 device class object */
+#ifdef AT_USING_SOCKET
+    m6315_socket_class_register(class);
+#endif
+    class->device_ops = &m6315_device_ops;
+
+    return at_device_class_register(class, AT_DEVICE_CLASS_M6315);
+}
+INIT_DEVICE_EXPORT(m6315_device_class_register);
+
+#endif /* AT_DEVICE_USING_M6315 */

class/m6315/at_device_m6315.h

@@ -0,0 +1,66 @@
+/*
+ * File      : at_device_m6315.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-16     chenyong     first version
+ */
+
+#ifndef __AT_DEVICE_M6315_H__
+#define __AT_DEVICE_M6315_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the m6315 device */
+#define AT_DEVICE_M6315_SOCKETS_NUM      8
+
+struct at_device_m6315
+{
+    char *device_name;
+    char *client_name;
+
+    int power_pin;
+    int power_status_pin;
+    size_t recv_line_num;
+    struct at_device device;
+
+    void *user_data;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* m6315 device socket initialize */
+int m6315_socket_init(struct at_device *device);
+
+/* m6315 device class socket register */
+int m6315_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_M6315_H__ */

class/m6315/at_socket_m6315.c

@@ -0,0 +1,636 @@
+/*
+ * File      : at_socket_m6315.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-06-12     malongwei    first version
+ * 2019-05-13     chenyong     multi AT socket client support
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_m6315.h>
+
+#define LOG_TAG                        "at.skt.m6315"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_M6315) && defined(AT_USING_SOCKET)
+
+#define M6315_MODULE_SEND_MAX_SIZE   1000
+
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event)       (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define M6315_EVENT_CONN_OK          (1L << 0)
+#define M6315_EVENT_SEND_OK          (1L << 1)
+#define M6315_EVENT_RECV_OK          (1L << 2)
+#define M6315_EVNET_CLOSE_OK         (1L << 3)
+#define M6315_EVENT_CONN_FAIL        (1L << 4)
+#define M6315_EVENT_SEND_FAIL        (1L << 5)
+#define M6315_EVENT_CONN_ALREADY     (1L << 6)
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static int m6315_socket_event_send(struct at_device *device, uint32_t event)
+{
+    return (int) rt_event_send(device->socket_event, event);
+}
+
+static int m6315_socket_event_recv(struct at_device *device, uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = RT_EOK;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(device->socket_event, event, option | RT_EVENT_FLAG_CLEAR, timeout, &recved);
+    if (result != RT_EOK)
+    {
+        return -RT_ETIMEOUT;
+    }
+
+    return recved;
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int m6315_socket_close(struct at_socket *socket)
+{
+    uint32_t event = 0;
+    int result = RT_EOK;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    
+    /* clear socket close event */
+    event = SET_EVENT(device_socket, M6315_EVNET_CLOSE_OK);
+    m6315_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+    
+    if (at_obj_exec_cmd(device->client, NULL, "AT+QICLOSE=%d", device_socket) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (m6315_socket_event_recv(device, event, rt_tick_from_millisecond(300*3), RT_EVENT_FLAG_AND) < 0)
+    {
+        LOG_E("%s device socket(%d) wait close OK timeout.", device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+
+__exit:    
+    return result;
+}
+
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int m6315_socket_connect(struct at_socket *socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
+{
+    uint32_t event = 0;
+    rt_bool_t retryed = RT_FALSE;
+    at_response_t resp = RT_NULL;
+    int result = RT_EOK, event_result = 0;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    resp = at_create_resp(128, 0, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+__retry:
+
+    /* clear socket connect event */
+    event = SET_EVENT(device_socket, M6315_EVENT_CONN_OK | M6315_EVENT_CONN_FAIL | M6315_EVENT_CONN_ALREADY);
+    m6315_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    if (is_client)
+    {
+        switch (type)
+        {
+        case AT_SOCKET_TCP:
+            /* send AT commands(eg: AT+QIOPEN=0,"TCP","x.x.x.x", 1234) to connect TCP server */
+            if (at_obj_exec_cmd(device->client, RT_NULL,
+                                "AT+QIOPEN=%d,\"TCP\",\"%s\",%d", device_socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        case AT_SOCKET_UDP:
+            if (at_obj_exec_cmd(device->client, RT_NULL,
+                                "AT+QIOPEN=%d,\"UDP\",\"%s\",%d", device_socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        default:
+            LOG_E("%s device not supported connect type : %d.", device->name, type);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+    }
+
+    /* waiting result event from AT URC, the device default connection timeout is 75 seconds, but it set to 10 seconds is convenient to use */
+    if (m6315_socket_event_recv(device, SET_EVENT(device_socket, 0), 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+    {
+        LOG_E("%s device socket(%d) wait connect result timeout.", device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* waiting OK or failed result */
+    event_result = m6315_socket_event_recv(device,
+            M6315_EVENT_CONN_OK | M6315_EVENT_CONN_FAIL | M6315_EVENT_CONN_ALREADY, 1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+    if (event_result < 0)
+    {
+        LOG_E("%s device socket(%d) wait connect OK|FAIL|ALREADY timeout.", device->name, device_socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* check result */
+    if (event_result & M6315_EVENT_CONN_FAIL)
+    {
+        if (retryed == RT_FALSE)
+        {
+            LOG_D("%s device socket(%d) connect failed, the socket was not be closedand now will connect retry.",
+                    device->name, device_socket);
+            if (m6315_socket_close(socket) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            retryed = RT_TRUE;
+            goto __retry;
+        }
+        LOG_E("%s device socket(%d) connect failed.", device->name, device_socket);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int m6315_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    uint32_t event = 0;
+    int result = RT_EOK, event_result = 0;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+
+    resp = at_create_resp(128, 2, 20 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* clear socket connect event */
+    event = SET_EVENT(device_socket, M6315_EVENT_SEND_OK | M6315_EVENT_SEND_FAIL);
+    m6315_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
+
+    /* set AT client end sign to deal with '>' sign.*/
+    at_obj_set_end_sign(device->client, '>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < M6315_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = M6315_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+QISEND" commands to AT server than receive the '>' response on the first line. */
+        if (at_obj_exec_cmd(device->client, resp, "AT+QISEND=%d,%d", device_socket, cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* waiting result event from AT URC */
+        if (m6315_socket_event_recv(device, SET_EVENT(device_socket, 0), 20 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
+        {
+            LOG_E("%s device socket(%d) wait send result timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* waiting OK or failed result */
+        event_result = m6315_socket_event_recv(device,
+                M6315_EVENT_SEND_OK | M6315_EVENT_SEND_FAIL, 15 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
+        if (event_result < 0)
+        {
+            LOG_E("%s device socket(%d) wait send connect OK|FAIL timeout.", device->name, device_socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* check result */
+        if (event_result & M6315_EVENT_SEND_FAIL)
+        {
+            LOG_E("%s device socket(%d) send failed.", device->name, device_socket);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data conflict */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result > 0 ? sent_size : result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int m6315_domain_resolve(const char *name, char ip[16])
+{
+#define RESOLVE_RETRY                  5
+
+    int i, result = RT_EOK;
+    char recv_ip[16] = { 0 };
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first init device failed.");
+        return -RT_ERROR;
+    }
+
+    /* The maximum response time is 20 seconds, affected by network status */
+    resp = at_create_resp(128, 4, 20 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    for (i = 0; i < RESOLVE_RETRY; i++)
+    {
+
+        if (at_obj_exec_cmd(device->client, resp, "AT+QIDNSGIP=\"%s\"", name) < 0)      //MODIFY name
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_parse_line_args(resp, 4, "%s", recv_ip) < 0)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;            
+        }
+
+        if (rt_strlen(recv_ip) < 8)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+        else
+        {
+            rt_thread_mdelay(10);
+            rt_strncpy(ip, recv_ip, 15);
+            ip[15] = '\0';
+            break;
+        }
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void m6315_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static void urc_connect_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    if (strstr(data, "ALREADY CONNECT"))
+    {
+        m6315_socket_event_send(device, SET_EVENT(device_socket, M6315_EVENT_CONN_ALREADY));
+        return;
+    }    
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (strstr(data, "CONNECT OK"))
+    {
+        m6315_socket_event_send(device, SET_EVENT(device_socket, M6315_EVENT_CONN_OK));
+    }
+    else if (strstr(data, "CONNECT FAIL"))
+    {
+        m6315_socket_event_send(device, SET_EVENT(device_socket, M6315_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_send_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+//    sscanf(data, "%d,%*s", &device_socket);
+
+    if (rt_strstr(data, "SEND OK"))
+    {
+        m6315_socket_event_send(device, SET_EVENT(device_socket, M6315_EVENT_SEND_OK));
+    }
+    else if (rt_strstr(data, "SEND FAIL"))
+    {
+        m6315_socket_event_send(device, SET_EVENT(device_socket, M6315_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the current socket by receive data */
+    sscanf(data, "%d,%*s", &device_socket);
+
+    if (rt_strstr(data, "CLOSE OK"))
+    {
+        m6315_socket_event_send(device, SET_EVENT(device_socket, M6315_EVNET_CLOSE_OK));
+    }
+    else if (rt_strstr(data, "CLOSED"))
+    {
+        struct at_socket *socket = RT_NULL;
+
+        /* get AT socket object by device socket descriptor */
+        socket = &(device->sockets[device_socket]);
+
+        /* notice the socket is disconnect by remote */
+        if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+        {
+            at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, RT_NULL, 0);
+        }
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    /* get the current socket and receive buffer size by receive data */
+    sscanf(data, "+RECEIVE:%d,%d:", &device_socket, (int *) &bfsz);
+    /* set receive timeout by receive buffer length, not less than 10 ms */
+    timeout = bfsz > 10 ? bfsz : 10;
+
+    if (device_socket < 0 || bfsz == 0)
+    {
+        return;
+    }
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory for receive buffer(%d).", bfsz);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("%s device receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get AT socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+/* m6315 device URC table for the socket data */
+static const struct at_urc urc_table[] =
+{
+    {"",            ", CONNECT OK\r\n",     urc_connect_func},
+    {"",            ", CONNECT FAIL\r\n",   urc_connect_func},
+    {"",            "ALREADY CONNECT\r\n",  urc_connect_func},
+    {"",            "SEND OK\r\n",          urc_send_func},
+    {"",            "SEND FAIL\r\n",        urc_send_func},
+    {"",            ", CLOSE OK\r\n",       urc_close_func},
+    {"",            ", CLOSED\r\n",         urc_close_func},
+    {"+RECEIVE:",   "\r\n",                 urc_recv_func},
+};
+
+static const struct at_socket_ops m6315_socket_ops =
+{
+    m6315_socket_connect,
+    m6315_socket_close,
+    m6315_socket_send,
+    m6315_domain_resolve,
+    m6315_socket_set_event_cb,
+};
+
+int m6315_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int m6315_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_M6315_SOCKETS_NUM;
+    class->socket_ops = &m6315_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_M6315 && AT_USING_SOCKET */

class/me3616/at_device_me3616.c

@@ -0,0 +1,947 @@
+/*
+ * File      : at_device_me3616.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-12-30     qiyongzhong  first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_me3616.h>
+
+#define LOG_TAG                         "at.dev.me3616"
+#include <at_log.h>
+
+#ifdef AT_DEVICE_USING_ME3616
+
+#ifndef ME3616_DEEP_SLEEP_EN
+#define ME3616_DEEP_SLEEP_EN              0//module support deep sleep mode
+#endif
+
+#define ME3616_WAIT_CONNECT_TIME          5000
+#define ME3616_THREAD_STACK_SIZE          2048
+#define ME3616_THREAD_PRIORITY            (RT_THREAD_PRIORITY_MAX/2)
+
+static int me3616_power_on(struct at_device *device)
+{
+    struct at_device_me3616 *me3616 = RT_NULL;
+    
+    me3616 = (struct at_device_me3616 *)device->user_data;
+    me3616->power_status = RT_TRUE;
+
+    /* not nead to set pin configuration for me3616 device power on */
+    if (me3616->power_pin == -1)
+    {
+        return(RT_EOK);
+    }
+    
+    rt_pin_write(me3616->power_pin, PIN_HIGH);
+    rt_thread_mdelay(500);
+    rt_pin_write(me3616->power_pin, PIN_LOW);
+    
+    LOG_D("power on success.");
+
+    return(RT_EOK);
+}
+
+static int me3616_power_off(struct at_device *device)
+{
+    at_response_t resp = RT_NULL;
+    struct at_device_me3616 *me3616 = RT_NULL;
+    
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return(-RT_ERROR);
+    }
+
+    at_obj_exec_cmd(device->client, resp, "AT+ZTURNOFF");//command response does not have "\r\n" after "OK"
+    /*if (at_obj_exec_cmd(device->client, resp, "AT+ZTURNOFF") != RT_EOK)
+    {
+        LOG_D("power off fail.");
+        at_delete_resp(resp);
+        return(-RT_ERROR);
+    }*/
+    
+    at_delete_resp(resp);
+    
+    me3616 = (struct at_device_me3616 *)device->user_data;
+    me3616->power_status = RT_FALSE;
+    
+    LOG_D("power off success.");
+    
+    return(RT_EOK);
+}
+
+static int me3616_sleep(struct at_device *device)
+{
+    at_response_t resp = RT_NULL;
+    struct at_device_me3616 *me3616 = RT_NULL;
+    
+    me3616 = (struct at_device_me3616 *)device->user_data;
+    if ( ! me3616->power_status)//power off
+    {
+        return(RT_EOK);
+    }
+    if (me3616->sleep_status)//is sleep status 
+    {
+        return(RT_EOK);
+    }
+    
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return(-RT_ERROR);
+    }
+    
+    if (at_obj_exec_cmd(device->client, resp, "AT+CPSMS=1,,,\"00111110\",\"00000001\"") != RT_EOK)
+    {
+        LOG_D("enable sleep fail.");
+        at_delete_resp(resp);
+        return(-RT_ERROR);
+    }
+
+    #if ME3616_DEEP_SLEEP_EN
+    if (at_obj_exec_cmd(device->client, resp, "AT+ZSLR") != RT_EOK)
+    {
+        LOG_D("startup entry into sleep fail.");
+        at_delete_resp(resp);
+        return(-RT_ERROR);
+    }
+    #endif
+    
+    at_delete_resp(resp);
+    me3616->sleep_status = RT_TRUE;
+    
+    LOG_D("sleep success.");
+    
+    return(RT_EOK);
+}
+
+static int me3616_wakeup(struct at_device *device)
+{
+    at_response_t resp = RT_NULL;
+    struct at_device_me3616 *me3616 = RT_NULL;
+
+    me3616 = (struct at_device_me3616 *)device->user_data;
+    if ( ! me3616->power_status)//power off
+    {
+        LOG_E("the power is off and the wake-up cannot be performed");
+        return(-RT_ERROR);
+    }
+    if ( ! me3616->sleep_status)//no sleep status
+    {
+        return(RT_EOK);
+    }
+    
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return(-RT_ERROR);
+    }
+    
+    #if ME3616_DEEP_SLEEP_EN
+    if (me3616->power_pin != -1)
+    {
+        rt_pin_write(me3616->power_pin, PIN_HIGH);
+        rt_thread_mdelay(100);
+        rt_pin_write(me3616->power_pin, PIN_LOW);
+        rt_thread_mdelay(200);
+    }
+    #endif
+    
+    if (at_obj_exec_cmd(device->client, resp, "AT+CPSMS=0") != RT_EOK)
+    {
+        LOG_D("wake up fail.");
+        at_delete_resp(resp);
+        return(-RT_ERROR);
+    }
+    
+    at_delete_resp(resp);
+    me3616->sleep_status = RT_FALSE;
+    
+    LOG_D("wake up success.");
+    
+    return(RT_EOK);
+}
+
+static int me3616_check_link_status(struct at_device *device)
+{
+    at_response_t resp = RT_NULL;
+    struct at_device_me3616 *me3616 = RT_NULL;
+    int result = -RT_ERROR;
+
+    RT_ASSERT(device);
+
+    me3616 = (struct at_device_me3616 *)device->user_data;
+    if ( ! me3616->power_status)//power off
+    {
+        LOG_D("the power is off.");
+        return(-RT_ERROR);
+    }
+    
+    #if ME3616_DEEP_SLEEP_EN
+    if (me3616->sleep_status)//is sleep status
+    {
+        if (me3616->power_pin != -1)
+        {
+            rt_pin_write(me3616->power_pin, PIN_HIGH);
+            rt_thread_mdelay(100);
+            rt_pin_write(me3616->power_pin, PIN_LOW);
+            rt_thread_mdelay(200);
+        }
+    }
+    #endif
+    
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return(-RT_ERROR);
+    }
+
+    result = -RT_ERROR;
+    if (at_obj_exec_cmd(device->client, resp, "AT+CGREG?") == RT_EOK)
+    {
+        int link_stat = 0;
+        if (at_resp_parse_line_args_by_kw(resp, "+CGREG:", "+CGREG: %*d,%d", &link_stat) > 0)
+        {
+            if (link_stat == 1 || link_stat == 5)
+            {
+                result = RT_EOK;
+            }
+        }
+    }
+    
+    #if ME3616_DEEP_SLEEP_EN
+    if (me3616->sleep_status)//is sleep status
+    {
+        if (at_obj_exec_cmd(device->client, resp, "AT+ZSLR") != RT_EOK)
+        {
+            LOG_D("startup entry into sleep fail.");
+        }
+    }
+    #endif
+    
+    at_delete_resp(resp);
+    
+    return(result);
+}
+
+
+/* =============================  me3616 network interface operations ============================= */
+/* set me3616 network interface device status and address information */
+static int me3616_netdev_set_info(struct netdev *netdev)
+{
+#define ME3616_INFO_RESP_SIZE      128
+#define ME3616_INFO_RESP_TIMO      rt_tick_from_millisecond(300)
+
+    int result = RT_EOK;
+    ip_addr_t addr;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    /* set network interface device status */
+    netdev_low_level_set_status(netdev, RT_TRUE);
+    netdev_low_level_set_link_status(netdev, RT_TRUE);
+    netdev_low_level_set_dhcp_status(netdev, RT_TRUE);
+
+    resp = at_create_resp(ME3616_INFO_RESP_SIZE, 0, ME3616_INFO_RESP_TIMO);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* set network interface device hardware address(IMEI) */
+    {
+        #define ME3616_NETDEV_HWADDR_LEN   8
+        #define ME3616_IMEI_LEN            15
+
+        char imei[ME3616_IMEI_LEN] = {0};
+        int i = 0, j = 0;
+
+        /* send "AT+GSN" commond to get device IMEI */
+        if (at_obj_exec_cmd(device->client, resp, "AT+GSN") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        if (at_resp_parse_line_args(resp, 2, "%s", imei) <= 0)
+        {
+            LOG_E("%s device prase \"AT+GSN\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        LOG_D("%s device IMEI number: %s", device->name, imei);
+
+        netdev->hwaddr_len = ME3616_NETDEV_HWADDR_LEN;
+        /* get hardware address by IMEI */
+        for (i = 0, j = 0; i < ME3616_NETDEV_HWADDR_LEN && j < ME3616_IMEI_LEN; i++, j+=2)
+        {
+            if (j != ME3616_IMEI_LEN - 1)
+            {
+                netdev->hwaddr[i] = (imei[j] - '0') * 10 + (imei[j + 1] - '0');
+            }
+            else
+            {
+                netdev->hwaddr[i] = (imei[j] - '0');
+            }
+        }
+    }
+
+    /* set network interface device IP address */
+    {
+        #define IP_ADDR_SIZE_MAX    16
+        char ipaddr[IP_ADDR_SIZE_MAX] = {0};
+        
+        /* send "AT+CGPADDR=1" commond to get IP address */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CGPADDR=1") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* parse response data "+CGPADDR: 1,<IP_address>" */
+        if (at_resp_parse_line_args_by_kw(resp, "+CGPADDR:", "+CGPADDR: %*[^\"]\"%[^\"]", ipaddr) <= 0)
+        {
+            LOG_E("%s device \"AT+CGPADDR=1\" cmd error.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        LOG_D("%s device IP address: %s", device->name, ipaddr);
+
+        /* set network interface address information */
+        inet_aton(ipaddr, &addr);
+        netdev_low_level_set_ipaddr(netdev, &addr);
+    }
+    
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static void me3616_check_link_status_entry(void *parameter)
+{
+#define ME3616_LINK_DELAY_TIME    (60 * RT_TICK_PER_SECOND)
+
+    rt_bool_t is_link_up;
+    struct at_device *device = RT_NULL;
+    struct netdev *netdev = (struct netdev *) parameter;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return;
+    }
+    
+    while (1)
+    {
+        is_link_up = (me3616_check_link_status(device) == RT_EOK);
+
+        netdev_low_level_set_link_status(netdev, is_link_up);
+
+        rt_thread_delay(ME3616_LINK_DELAY_TIME);
+    }
+}
+
+static int me3616_netdev_check_link_status(struct netdev *netdev)
+{
+#define ME3616_LINK_THREAD_TICK           20
+#define ME3616_LINK_THREAD_STACK_SIZE     (1024 + 512)
+#define ME3616_LINK_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX - 2)
+
+    rt_thread_t tid;
+    char tname[RT_NAME_MAX] = {0};
+
+    RT_ASSERT(netdev);
+
+    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);
+
+    /* create me3616 link status polling thread  */
+    tid = rt_thread_create(tname, me3616_check_link_status_entry, (void *)netdev,
+                           ME3616_LINK_THREAD_STACK_SIZE, ME3616_LINK_THREAD_PRIORITY, ME3616_LINK_THREAD_TICK);
+    if (tid != RT_NULL)
+    {
+        rt_thread_startup(tid);
+    }
+
+    return RT_EOK;
+}
+
+static int me3616_net_init(struct at_device *device);
+
+static int me3616_netdev_set_up(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_FALSE)
+    {
+        me3616_net_init(device);
+        device->is_init = RT_TRUE;
+
+        netdev_low_level_set_status(netdev, RT_TRUE);
+        LOG_D("network interface device(%s) set up status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int me3616_netdev_set_down(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_TRUE)
+    {
+        me3616_power_off(device);
+        device->is_init = RT_FALSE;
+
+        netdev_low_level_set_status(netdev, RT_FALSE);
+        LOG_D("network interface device(%s) set down status.", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+#ifdef NETDEV_USING_PING
+static int me3616_netdev_ping(struct netdev *netdev, const char *host,
+        size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp)
+{
+#define ME3616_PING_RESP_SIZE       256
+#define ME3616_PING_IP_SIZE         16
+#define ME3616_PING_TIMEO           (10 * RT_TICK_PER_SECOND)
+
+    rt_err_t result = RT_EOK;
+    int response = -1, recv_data_len, ping_time, ttl;
+    char ip_addr[ME3616_PING_IP_SIZE] = {0};
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(host);
+    RT_ASSERT(ping_resp);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(ME3616_PING_RESP_SIZE, 0, ME3616_PING_TIMEO);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create");
+        return -RT_ENOMEM;
+    }
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+EDNS=\"%s\"", host) != RT_EOK)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "IPV4:", "IPV4:%s\r", ip_addr) <= 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    at_resp_set_info(resp, ME3616_PING_RESP_SIZE, 8, timeout);
+
+    /* send "AT+PING=<host>[-l/L <p_size>] [-n/N <count>][-w/W <time>][-6][-i <value>][-d<value>] */
+    if (at_obj_exec_cmd(device->client, resp, "AT+PING=%s -d 1 -n 1 -w %d", ip_addr, timeout) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "received=", "%*[^=]=%d%*[^=]=%d%*[^=]=%d", 
+                                        &recv_data_len, &ping_time, &ttl) <= 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    inet_aton(ip_addr, &(ping_resp->ip_addr));
+    ping_resp->data_len = recv_data_len;
+    ping_resp->ticks = ping_time;
+    ping_resp->ttl = ttl;
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+#endif /* NETDEV_USING_PING */
+
+const struct netdev_ops me3616_netdev_ops =
+{
+    me3616_netdev_set_up,
+    me3616_netdev_set_down,
+
+    RT_NULL,
+    RT_NULL,
+    RT_NULL,
+
+#ifdef NETDEV_USING_PING
+    me3616_netdev_ping,
+    RT_NULL,
+#endif
+    RT_NULL,
+};
+
+static struct netdev *me3616_netdev_add(const char *netdev_name)
+{
+#define ETHERNET_MTU        1500
+#define HWADDR_LEN          8
+    struct netdev *netdev = RT_NULL;
+
+    netdev = netdev_get_by_name(netdev_name);
+    if(netdev != RT_NULL)
+    {
+        return(netdev);
+    }
+    
+    netdev = (struct netdev *)rt_calloc(1, sizeof(struct netdev));
+    if (netdev == RT_NULL)
+    {
+        LOG_E("no memory for netdev create.");
+        return RT_NULL;
+    }
+
+    netdev->mtu = ETHERNET_MTU;
+    netdev->ops = &me3616_netdev_ops;
+    netdev->hwaddr_len = HWADDR_LEN;
+
+#ifdef SAL_USING_AT
+    extern int sal_at_netdev_set_pf_info(struct netdev *netdev);
+    /* set the network interface socket/netdb operations */
+    sal_at_netdev_set_pf_info(netdev);
+#endif
+
+    netdev_register(netdev, netdev_name, RT_NULL);
+
+    return netdev;
+}
+
+/* =============================  me3616 device operations ============================= */
+
+/* initialize for me3616 */
+static void me3616_init_thread_entry(void *parameter)
+{
+#define INIT_RETRY                     5
+#define CPIN_RETRY                     5
+#define CSQ_RETRY                      20
+#define CGREG_RETRY                    60
+#define IPADDR_RETRY                   10
+
+    int i;
+    int retry_num = INIT_RETRY;
+    rt_err_t result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = (struct at_device *) parameter;
+    struct at_client *client = device->client;
+
+    resp = at_create_resp(256, 0, rt_tick_from_millisecond(500));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    LOG_D("start init %s device.", device->name);
+
+    while (retry_num--)
+    {
+        /* power on the me3616 device */
+        me3616_power_on(device);
+        rt_thread_mdelay(2000);
+
+        /* wait me3616 startup finish, send AT every 500ms, if receive OK, SYNC success*/
+        if (at_client_obj_wait_connect(client, ME3616_WAIT_CONNECT_TIME))
+        {
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        
+        /* disable echo */
+        if (at_obj_exec_cmd(device->client, resp, "ATE0") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        /* disable PSM mode  */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CPSMS=0") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* disable eDRX mode  */
+        if (at_obj_exec_cmd(device->client, resp, "AT+CEDRXS=0") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* disable low power mode  */
+        if (at_obj_exec_cmd(device->client, resp, "AT+ESOSETRPT=1") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }  
+        
+        /* disable sleep function  */
+        if (at_obj_exec_cmd(device->client, resp, "AT+ZSLR=0") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        } 
+        
+        /* Get the baudrate */
+        if (at_obj_exec_cmd(device->client, resp, "AT+IPR?") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        at_resp_parse_line_args_by_kw(resp, "+IPR:", "+IPR: %d\r", &i);
+        LOG_D("%s device baudrate %d", device->name, i);
+        
+        /* get module version */
+        if (at_obj_exec_cmd(device->client, resp, "ATI") != RT_EOK)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        for (i = 0; i < (int) resp->line_counts - 1; i++)
+        {
+            LOG_D("%s", at_resp_get_line(resp, i + 1));
+        }   
+        
+        /* check SIM card */
+        for (i = 0; i < CPIN_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CPIN?") == RT_EOK)
+            {
+                if (at_resp_get_line_by_kw(resp, "READY") != RT_NULL)
+                    break;
+            }
+        }
+        if (i == CPIN_RETRY)
+        {
+            LOG_E("%s device SIM card detection failed.", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* check signal strength */
+        for (i = 0; i < CSQ_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CSQ") == RT_EOK)
+            {
+                int signal_strength = 0, err_rate = 0;
+                
+                if (at_resp_parse_line_args_by_kw(resp, "+CSQ:", "+CSQ: %d,%d", &signal_strength, &err_rate) > 0)
+                {
+                    if ((signal_strength != 99) && (signal_strength != 0))
+                    {
+                        LOG_D("%s device signal strength: %d, channel bit error rate: %d",
+                                device->name, signal_strength, err_rate);
+                        break;
+                    }
+                }
+            }
+        }
+        if (i == CSQ_RETRY)
+        {
+            LOG_E("%s device signal strength check failed", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+                
+        /* check the GPRS network is registered */
+        for (i = 0; i < CGREG_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CGREG?") == RT_EOK)
+            {
+                int link_stat = 0;
+                
+                if (at_resp_parse_line_args_by_kw(resp, "+CGREG:", "+CGREG: %*d,%d", &link_stat) > 0)
+                {
+                    if ((link_stat == 1) || (link_stat == 5))
+                    {
+                        LOG_D("%s device GPRS is registered", device->name);
+                        break;
+                    }
+                }
+            }
+        }
+        if (i == CGREG_RETRY)
+        {
+            LOG_E("%s device GPRS is register failed", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        /* check the GPRS network IP address */
+        for (i = 0; i < IPADDR_RETRY; i++)
+        {
+            rt_thread_mdelay(1000);
+            if (at_obj_exec_cmd(device->client, resp, "AT+CGPADDR=1") == RT_EOK)
+            {
+                #define IP_ADDR_SIZE_MAX    16
+                char ipaddr[IP_ADDR_SIZE_MAX] = {0};
+                
+                /* parse response data "+CGPADDR: 1,<IP_address>" */
+                if (at_resp_parse_line_args_by_kw(resp, "+CGPADDR:", "+CGPADDR: %*[^\"]\"%[^\"]", ipaddr) > 0)
+                {
+                    LOG_D("%s device IP address: %s", device->name, ipaddr);
+                    break;
+                }
+            }
+        }
+        if (i == IPADDR_RETRY)
+        {
+            LOG_E("%s device GPRS is get IP address failed", device->name);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        /* initialize successfully  */
+        result = RT_EOK;
+        break;
+
+    __exit:
+        if (result != RT_EOK)
+        {
+            /* power off the me3616 device */
+            me3616_power_off(device);
+            rt_thread_mdelay(1000);
+
+            LOG_I("%s device initialize retry...", device->name);
+        }
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (result == RT_EOK)
+    {
+        /* set network interface device status and address information */
+        me3616_netdev_set_info(device->netdev);
+        /* check and create link staus sync thread  */
+        if (rt_thread_find(device->netdev->name) == RT_NULL)
+        {
+            me3616_netdev_check_link_status(device->netdev);
+        }
+
+        LOG_I("%s device network initialize success.", device->name);
+    }
+    else
+    {
+        LOG_E("%s device network initialize failed(%d).", device->name, result);
+    }
+}
+
+/* me3616 device network initialize */
+static int me3616_net_init(struct at_device *device)
+{
+#ifdef AT_DEVICE_ME3616_INIT_ASYN
+    rt_thread_t tid;
+
+    tid = rt_thread_create("me3616_net", me3616_init_thread_entry, (void *)device,
+                           ME3616_THREAD_STACK_SIZE, ME3616_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("create %s device init thread failed.", device->name);
+        return -RT_ERROR;
+    }
+#else
+    me3616_init_thread_entry(device);
+#endif /* AT_DEVICE_ME3616_INIT_ASYN */
+
+    return RT_EOK;
+}
+
+static int me3616_init(struct at_device *device)
+{
+    struct at_device_me3616 *me3616 = RT_NULL;
+
+    RT_ASSERT(device);
+
+    me3616 = (struct at_device_me3616 *) device->user_data;
+    me3616->power_status = RT_FALSE;//default power is off.
+    me3616->sleep_status = RT_FALSE;//default sleep is disabled.
+
+    /* initialize AT client */
+    at_client_init(me3616->client_name, me3616->recv_line_num);
+
+    device->client = at_client_get(me3616->client_name);
+    if (device->client == RT_NULL)
+    {
+        LOG_E("get AT client(%s) failed.", me3616->client_name);
+        return -RT_ERROR;
+    }
+
+    /* register URC data execution function  */
+#ifdef AT_USING_SOCKET
+    me3616_socket_init(device);
+#endif
+
+    /* add me3616 device to the netdev list */
+    device->netdev = me3616_netdev_add(me3616->device_name);
+    if (device->netdev == RT_NULL)
+    {
+        LOG_E("add netdev(%s) failed.", me3616->device_name);
+        return -RT_ERROR;
+    }
+
+    /* initialize me3616 pin configuration */
+    if (me3616->power_pin != -1)
+    {
+        rt_pin_write(me3616->power_pin, PIN_LOW);
+        rt_pin_mode(me3616->power_pin, PIN_MODE_OUTPUT);
+    }
+
+    /* initialize me3616 device network */
+    return me3616_netdev_set_up(device->netdev);
+}
+
+static int me3616_deinit(struct at_device *device)
+{
+    RT_ASSERT(device);
+    
+    return me3616_netdev_set_down(device->netdev);
+}
+
+static int me3616_control(struct at_device *device, int cmd, void *arg)
+{
+    int result = -RT_ERROR;
+
+    RT_ASSERT(device);
+
+    switch (cmd)
+    {
+    case AT_DEVICE_CTRL_SLEEP:
+        result = me3616_sleep(device);
+        break;
+    case AT_DEVICE_CTRL_WAKEUP:
+        result = me3616_wakeup(device);
+        break;
+    case AT_DEVICE_CTRL_POWER_ON:
+    case AT_DEVICE_CTRL_POWER_OFF:
+    case AT_DEVICE_CTRL_RESET:
+    case AT_DEVICE_CTRL_LOW_POWER:
+    case AT_DEVICE_CTRL_NET_CONN:
+    case AT_DEVICE_CTRL_NET_DISCONN:
+    case AT_DEVICE_CTRL_SET_WIFI_INFO:
+    case AT_DEVICE_CTRL_GET_SIGNAL:
+    case AT_DEVICE_CTRL_GET_GPS:
+    case AT_DEVICE_CTRL_GET_VER:
+        LOG_W("not support the control command(%d).", cmd);
+        break;
+    default:
+        LOG_E("input error control command(%d).", cmd);
+        break;
+    }
+
+    return result;
+}
+
+const struct at_device_ops me3616_device_ops =
+{
+    me3616_init,
+    me3616_deinit,
+    me3616_control,
+};
+
+static int me3616_device_class_register(void)
+{
+    struct at_device_class *class = RT_NULL;
+
+    class = (struct at_device_class *) rt_calloc(1, sizeof(struct at_device_class));
+    if (class == RT_NULL)
+    {
+        LOG_E("no memory for device class create.");
+        return -RT_ENOMEM;
+    }
+
+    /* fill me3616 device class object */
+#ifdef AT_USING_SOCKET
+    me3616_socket_class_register(class);
+#endif
+    class->device_ops = &me3616_device_ops;
+
+    return at_device_class_register(class, AT_DEVICE_CLASS_ME3616);
+}
+INIT_DEVICE_EXPORT(me3616_device_class_register);
+
+#endif /* AT_DEVICE_USING_ME3616 */
+

class/me3616/at_device_me3616.h

@@ -0,0 +1,71 @@
+/*
+ * File      : at_device_me3616.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-12-30     qiyongzhong     first version
+ */
+
+#ifndef __AT_DEVICE_ME3616_H__
+#define __AT_DEVICE_ME3616_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the me3616 device */
+#define AT_DEVICE_ME3616_SOCKETS_NUM  5
+
+struct at_device_me3616
+{
+    char *device_name;
+    char *client_name;
+
+    int power_pin;
+    int power_status_pin;
+    size_t recv_line_num;
+    struct at_device device;
+
+    void *socket_data;
+    void *user_data;
+    
+    rt_bool_t power_status;
+    rt_bool_t sleep_status;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* me3616 device socket initialize */
+int me3616_socket_init(struct at_device *device);
+
+/* me3616 device class socket register */
+int me3616_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_ME3616_H__ */
+

class/me3616/at_socket_me3616.c

@@ -0,0 +1,594 @@
+/*
+ * File      : at_socket_me3616.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-12-30     qiyongzhong  first version
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_me3616.h>
+
+#define LOG_TAG                        "at.skt.me3616"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_ME3616) && defined(AT_USING_SOCKET)
+
+#define ME3616_MODULE_SEND_MAX_SIZE       512
+
+static int me3616_socket_fd[AT_DEVICE_ME3616_SOCKETS_NUM] = {0};
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+static int me3616_get_socket_idx(int sock)
+{
+    int i;
+    
+    if (sock < 0)
+    {
+        return(-1);
+    }
+    
+    for (i=0; i<AT_DEVICE_ME3616_SOCKETS_NUM; i++)
+    {
+        if (me3616_socket_fd[i] == sock)
+            return(i);
+    }
+
+    return(-1);
+}
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int me3616_socket_close(struct at_socket *socket)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    if (me3616_socket_fd[device_socket] == -1)
+    {
+        return RT_EOK;
+    }
+    
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    result = at_obj_exec_cmd(device->client, resp, "AT+ESOCL=%d", me3616_socket_fd[device_socket]);
+    me3616_socket_fd[device_socket] = -1;
+    
+    at_delete_resp(resp);
+
+    return result;
+}
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int me3616_socket_connect(struct at_socket *socket, char *ip, int32_t port,
+    enum at_socket_type type, rt_bool_t is_client)
+{
+    #define CONN_RESP_SIZE  128
+    
+    int type_code = 0;
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    int sock = -1;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    if ( ! is_client)
+    {
+        return -RT_ERROR;
+    }
+
+    switch(type)
+    {
+        case AT_SOCKET_TCP:
+            type_code = 1;
+            break;
+        case AT_SOCKET_UDP:
+            type_code = 2;
+            break;
+        default:
+            LOG_E("%s device socket(%d)  connect type error.", device->name, device_socket);
+            return -RT_ERROR;
+    }
+
+    resp = at_create_resp(CONN_RESP_SIZE, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    if (me3616_socket_fd[device_socket] != -1)
+    {
+        at_obj_exec_cmd(device->client, resp, "AT+ESOCL=%d", me3616_socket_fd[device_socket]);
+        me3616_socket_fd[device_socket] = -1;
+    }
+    
+    if (at_obj_exec_cmd(device->client, resp, "AT+ESOC=1,%d,1", type_code) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "+ESOC=", "+ESOC=%d", &sock) <= 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    at_resp_set_info(resp, CONN_RESP_SIZE, 0, (45*RT_TICK_PER_SECOND));
+    if (at_obj_exec_cmd(device->client, resp, "AT+ESOCON=%d,%d,\"%s\"", sock, port, ip) < 0)
+    {
+        at_resp_set_info(resp, CONN_RESP_SIZE, 0, rt_tick_from_millisecond(300));
+        at_obj_exec_cmd(device->client, resp, "AT+ESOCL=%d", sock);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    me3616_socket_fd[device_socket] = sock;
+    
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_get_send_size(struct at_socket *socket, size_t *nacked)
+{
+    int result = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    int remain_size;
+
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.", device->name);
+        return -RT_ENOMEM;
+    }
+
+    if (at_obj_exec_cmd(device->client, resp, "AT+ESOTCPBUF=%d", me3616_socket_fd[device_socket]) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "+ESOTCPBUF=", "+ESOTCPBUF=%d", &remain_size) <= 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    *nacked = 4096 - remain_size;
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int at_wait_send_finish(struct at_socket *socket, rt_tick_t timeout)
+{
+    rt_tick_t last_time = rt_tick_get();
+    size_t nacked = 0xFFFF;
+
+    while (rt_tick_get() - last_time <= timeout)
+    {
+        at_get_send_size(socket, &nacked);
+        if (nacked == 0)
+        {
+            return RT_EOK;
+        }
+        rt_thread_mdelay(50);
+    }
+
+    return -RT_ETIMEOUT;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int me3616_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    #define SEND_RESP_SIZE      128
+    
+    int result = 0;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+
+    resp = at_create_resp(SEND_RESP_SIZE, 2, RT_TICK_PER_SECOND/2);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < ME3616_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = ME3616_MODULE_SEND_MAX_SIZE;
+        }
+
+        at_resp_set_info(resp, SEND_RESP_SIZE, 2, RT_TICK_PER_SECOND/2);
+        if (at_obj_exec_cmd(device->client, resp, "AT+ESOSENDRAW=%d,%d", me3616_socket_fd[device_socket], (int)cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (at_resp_get_line_by_kw(resp, "CONNECT") == RT_NULL)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        rt_thread_mdelay(5);//delay at least 4 ms
+        
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* wait respone "NO CARRIER ... OK " */
+        at_resp_set_info(resp, SEND_RESP_SIZE, 0, (2*RT_TICK_PER_SECOND));
+        if (at_obj_exec_cmd(device->client, resp, "") < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+        
+        if (type == AT_SOCKET_TCP)
+        {
+            at_wait_send_finish(socket, (5*RT_TICK_PER_SECOND));
+        }
+        else
+        {
+            rt_thread_mdelay(10);//delay at least 10 ms
+        }
+        
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result > 0 ? sent_size : result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int me3616_domain_resolve(const char *name, char ip[16])
+{
+    int result;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first init device failed.");
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 0, (15 * RT_TICK_PER_SECOND));
+    if (!resp)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    result = at_obj_exec_cmd(device->client, resp, "AT+EDNS=\"%s\"", name);
+    if (result != RT_EOK)
+    {
+        LOG_E("%s device \"AT+EDNS=\"%s\"\" cmd error.", device->name, name);
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args_by_kw(resp, "IPV4:", "IPV4:%s\r", ip) <= 0)
+    {
+        LOG_E("%s device prase \"AT+EDNS=\"%s\"\" cmd error.", device->name, name);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    ip[15] = 0;
+    if (rt_strlen(ip) < 8)
+    {
+        result = -RT_ERROR;
+    }
+    else
+    {
+        result = RT_EOK;
+    }
+
+ __exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void me3616_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static void urc_close_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int sock = -1;
+    int err_code = 0;
+    int device_socket = 0;
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+ESOERR=%d,%d", &sock, &err_code);
+    
+    device_socket = me3616_get_socket_idx(sock);
+    if (device_socket < 0 || err_code < 0 || err_code > 4)
+    {
+        return;
+    }
+    
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the socket is disconnect by remote */
+    if (at_evt_cb_set[AT_SOCKET_EVT_CLOSED])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_CLOSED](socket, AT_SOCKET_EVT_CLOSED, NULL, 0);
+    }
+}
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int sock = -1;
+    int device_socket = 0;
+    rt_int32_t timeout;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    sscanf(data, "+ESONMI=%d,", &sock);
+    device_socket = me3616_get_socket_idx(sock);
+    if (device_socket < 0)
+    {
+        return;
+    }
+
+    while(temp_size < sizeof(temp))
+    {
+        at_client_obj_recv(client, temp+temp_size, 1, 10);
+        if ( *(temp+temp_size) == ',')
+        {
+            *(temp+temp_size) = 0;
+            break;
+        }
+        temp_size++;
+    }
+    if (temp_size == sizeof(temp))
+    {
+        return;
+    }
+    
+    sscanf(temp, "%d", (int *)&bfsz);
+    if(bfsz == 0)
+    {
+        return;
+    }
+    
+    timeout = bfsz > 10 ? bfsz : 10;
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory for URC receive buffer(%d).", bfsz);
+        /* read and clean the coming data */
+        temp_size = 0;
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("%s device receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* read end "\r\n" */
+    at_client_obj_recv(client, temp, 2, 5);
+
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"+ESOERR=",    "\r\n",                 urc_close_func},
+    {"+ESONMI=",    ",",                    urc_recv_func},
+};
+
+static const struct at_socket_ops me3616_socket_ops =
+{
+    me3616_socket_connect,
+    me3616_socket_close,
+    me3616_socket_send,
+    me3616_domain_resolve,
+    me3616_socket_set_event_cb,
+};
+
+int me3616_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    rt_memset(me3616_socket_fd, -1, sizeof(me3616_socket_fd));
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int me3616_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_ME3616_SOCKETS_NUM;
+    class->socket_ops = &me3616_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_ME3616 && AT_USING_SOCKET */
+

class/sim76xx/at_device_sim76xx.c

@@ -277,7 +277,7 @@ static int sim76xx_netdev_check_link_status(struct netdev *netdev)
 
     RT_ASSERT(netdev);
 
-    rt_snprintf(tname, RT_NAME_MAX, "%s_link", netdev->name);
+    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);
 
     tid = rt_thread_create(tname, check_link_status_entry, (void *)netdev,
                            SIM76XX_LINK_THREAD_STACK_SIZE, SIM76XX_LINK_THREAD_PRIORITY, SIM76XX_LINK_THREAD_TICK);
@@ -529,7 +529,7 @@ static void sim76xx_init_thread_entry(void *parameter)
             at_obj_exec_cmd(client, resp, "AT+CPIN?");
             if (at_resp_get_line_by_kw(resp, "READY"))
             {
-                LOG_D("%s device SIM card detection failed.", device->name);
+                LOG_D("%s device SIM card detection success.", device->name);
                 break;
             }
             LOG_I("\"AT+CPIN\" commands send retry...");
@@ -704,7 +704,11 @@ static void sim76xx_init_thread_entry(void *parameter)
     {
         /* set network interface device status and address information */
         sim76xx_netdev_set_info(device->netdev);
-        sim76xx_netdev_check_link_status(device->netdev);
+        /* check and create link staus sync thread  */
+        if (rt_thread_find(device->netdev->name) == RT_NULL)
+        {
+            sim76xx_netdev_check_link_status(device->netdev);
+        }
 
         LOG_I("%s device network initialize success!", device->name);
     }

class/sim800c/at_device_sim800c.c

@@ -298,7 +298,7 @@ static int sim800c_netdev_check_link_status(struct netdev *netdev)
 
     RT_ASSERT(netdev);
 
-    rt_snprintf(tname, RT_NAME_MAX, "%s_link", netdev->name);
+    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);
 
     tid = rt_thread_create(tname, check_link_status_entry, (void *) netdev,
             SIM800C_LINK_THREAD_STACK_SIZE, SIM800C_LINK_THREAD_PRIORITY, SIM800C_LINK_THREAD_TICK);
@@ -796,7 +796,11 @@ static void sim800c_init_thread_entry(void *parameter)
     {
         /* set network interface device status and address information */
         sim800c_netdev_set_info(device->netdev);
-        sim800c_netdev_check_link_status(device->netdev);
+        /* check and create link staus sync thread  */
+        if (rt_thread_find(device->netdev->name) == RT_NULL)
+        {
+            sim800c_netdev_check_link_status(device->netdev);
+        }
 
         LOG_I("%s device network initialize success!", device->name);
 

class/sim800c/at_socket_sim800c.c

@@ -84,22 +84,14 @@ static int sim800c_socket_close(struct at_socket *socket)
 {
     uint32_t event = 0;
     int result = RT_EOK;
-    at_response_t resp = RT_NULL;
     int device_socket = (int) socket->user_data;
     struct at_device *device = (struct at_device *) socket->device;
     
-    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
-    if (resp == RT_NULL)
-    {
-        LOG_E("no memory for resp create.");
-        return -RT_ENOMEM;
-    }
-
     /* clear socket close event */
     event = SET_EVENT(device_socket, SIM800C_EVNET_CLOSE_OK);
     sim800c_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);
     
-    if (at_obj_exec_cmd(device->client, resp, "AT+CIPCLOSE=%d", device_socket) < 0)
+    if (at_obj_exec_cmd(device->client, NULL, "AT+CIPCLOSE=%d", device_socket) < 0)
     {
         result = -RT_ERROR;
         goto __exit;
@@ -113,11 +105,6 @@ static int sim800c_socket_close(struct at_socket *socket)
     }
 
 __exit:    
-    if (resp)
-    {
-        at_delete_resp(resp);
-    }
-
     return result;
 }
 

class/w60x/at_device_w60x.c

@@ -0,0 +1,955 @@
+/*
+ * File      : at_device_w60x.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-06-20     chenyong     first version
+ * 2019-05-09     chenyong     multi AT socket client support
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_w60x.h>
+
+#define LOG_TAG                        "at.dev.w60x"
+
+#include <at_log.h>
+
+#ifdef AT_DEVICE_USING_W60X
+
+#define W60X_WAIT_CONNECT_TIME      5000
+#define W60X_THREAD_STACK_SIZE      2048
+#define W60X_THREAD_PRIORITY        (RT_THREAD_PRIORITY_MAX / 2)
+
+/* =============================  w60x network interface operations ============================= */
+
+static int w60x_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server);
+
+static rt_bool_t w60x_is_join_start = RT_FALSE;
+
+static void w60x_get_netdev_info(struct rt_work *work, void *work_data)
+{
+#define AT_ADDR_LEN          32
+#define AT_ERR_DNS_SERVER    "0.0.0.0"
+#define AT_DEF_DNS_SERVER    "114.114.114.114"
+
+    at_response_t resp = RT_NULL;
+    char ip[AT_ADDR_LEN] = {0}, mac[AT_ADDR_LEN] = {0};
+    char gateway[AT_ADDR_LEN] = {0}, netmask[AT_ADDR_LEN] = {0};
+    char dns_server1[AT_ADDR_LEN] = {0}, dns_server2[AT_ADDR_LEN] = {0};
+    const char *resp_expr1 = "+OK=%s";
+    const char *resp_expr2 = "+OK=%d,\"%[^\"]\",\"%[^\"]\",\"%[^\"]\",\"%[^\"]\",\"%[^\"]\"";
+    const char *resp_expr3 = "+OK=%d,%[^,],%[^,],%[^,],%[^,]";
+    rt_int32_t link_status = 0;
+    ip_addr_t ip_addr;
+    rt_uint32_t mac_addr[6] = {0};
+    rt_uint32_t num = 0;
+    rt_int32_t dhcp_stat = 0;
+    struct rt_delayed_work *delay_work = (struct rt_delayed_work *)work;
+    struct at_device *device = (struct at_device *)work_data;
+    struct netdev *netdev = device->netdev;
+    struct at_client *client = device->client;
+    char *pos;
+
+    if (delay_work)
+    {
+        rt_free(delay_work);
+    }
+
+    resp = at_create_resp(512, 1, rt_tick_from_millisecond(3000));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    at_obj_set_end_sign(device->client, '\r');
+
+    /* send mac addr query commond "AT+QMAC" and wait response */
+    if (at_obj_exec_cmd(client, resp, "AT+QMAC") < 0)
+    {
+        goto __exit;
+    }
+
+    pos = rt_strstr(resp->buf, "+OK=");
+    if (!pos)
+    {
+        LOG_E("%s device parse \"AT+QMAC\" cmd error.", device->name);
+        goto __exit;
+    }
+
+    sscanf(pos, resp_expr1, mac);
+
+    /* send addr info query commond "AT+CIPSTA?" and wait response */
+    if (at_obj_exec_cmd(client, resp, "AT+LKSTT") < 0)
+    {
+        LOG_E("%s device send \"AT+LKSTT\" cmd error.", device->name);
+        goto __exit;
+    }
+
+    pos = rt_strstr(resp->buf, "+OK=");
+    if (!pos)
+    {
+        LOG_E("%s device prase \"AT+LKSTT\" cmd error.", device->name);
+        goto __exit;
+    }
+
+    sscanf(pos, resp_expr2, &link_status, ip, netmask, gateway, dns_server1, dns_server2);
+
+    /* set netdev info */
+    inet_aton(gateway, &ip_addr);
+    netdev_low_level_set_gw(netdev, &ip_addr);
+    inet_aton(netmask, &ip_addr);
+    netdev_low_level_set_netmask(netdev, &ip_addr);
+    inet_aton(ip, &ip_addr);
+    netdev_low_level_set_ipaddr(netdev, &ip_addr);
+    sscanf(mac, "%02x%02x%02x%02x%02x%02x",
+            &mac_addr[0], &mac_addr[1], &mac_addr[2], &mac_addr[3], &mac_addr[4], &mac_addr[5]);
+    for (num = 0; num < netdev->hwaddr_len; num++)
+    {
+        netdev->hwaddr[num] = mac_addr[num];
+    }
+
+    /* set primary DNS server address */
+    if (rt_strlen(dns_server1) > 0 &&
+            rt_strncmp(dns_server1, AT_ERR_DNS_SERVER, rt_strlen(AT_ERR_DNS_SERVER)) != 0)
+    {
+        inet_aton(dns_server1, &ip_addr);
+        netdev_low_level_set_dns_server(netdev, 0, &ip_addr);
+    }
+    else
+    {
+        inet_aton(AT_DEF_DNS_SERVER, &ip_addr);
+        w60x_netdev_set_dns_server(netdev, 0, &ip_addr);
+    }
+
+    /* set secondary DNS server address */
+    if (rt_strlen(dns_server2) > 0 )
+    {
+        inet_aton(dns_server2, &ip_addr);
+        netdev_low_level_set_dns_server(netdev, 1, &ip_addr);
+    }
+
+    /* send DHCP query commond " AT+NIP" and wait response */
+    if (at_obj_exec_cmd(client, resp, "AT+NIP") < 0)
+    {
+        goto __exit;
+    }
+
+    pos = rt_strstr(resp->buf, "+OK=");
+ 
+    /* parse response data, get the DHCP status */
+    if (!pos)
+    {
+        LOG_E("%s device prase DHCP status error.", device->name);
+        goto __exit;
+    }
+
+    sscanf(pos, resp_expr3, &dhcp_stat, ip, netmask, gateway, dns_server1);
+
+    /* 0 - DHCP, 1 - static ip */
+    netdev_low_level_set_dhcp_status(netdev, dhcp_stat ? RT_FALSE : RT_TRUE);
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+}
+
+static int w60x_net_init(struct at_device *device);
+
+static int w60x_netdev_set_up(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_FALSE)
+    {
+        w60x_net_init(device);
+        netdev_low_level_set_status(netdev, RT_TRUE);
+        LOG_D("network interface device(%s) set up status", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int w60x_netdev_set_down(struct netdev *netdev)
+{
+    struct at_device *device = RT_NULL;
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device by netdev(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    if (device->is_init == RT_TRUE)
+    {
+        device->is_init = RT_FALSE;
+        netdev_low_level_set_status(netdev, RT_FALSE);
+        LOG_D("network interface device(%s) set down status", netdev->name);
+    }
+
+    return RT_EOK;
+}
+
+static int w60x_netdev_set_addr_info(struct netdev *netdev, ip_addr_t *ip_addr, ip_addr_t *netmask, ip_addr_t *gw)
+{
+#define IPADDR_SIZE            16
+
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char ip_str[IPADDR_SIZE] = {0};
+    char gw_str[IPADDR_SIZE] = {0};
+    char netmask_str[IPADDR_SIZE] = {0};
+    char dns_str[IPADDR_SIZE] = {0};
+    rt_uint8_t dhcp_stat = 0;
+    const char *resp_expr = "+OK=%d,%s,%s,%s,%s";
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(ip_addr || netmask || gw);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 1, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+
+    /* send DHCP query commond " AT+NIP" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+NIP") < 0)
+    {
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args(resp, 1, resp_expr, dhcp_stat, ip_str, netmask_str, gw_str, dns_str) <= 0)
+    {
+        LOG_E("%s device prase DHCP status error.", device->name);
+        goto __exit;
+    }
+
+    /* Convert numeric IP address into decimal dotted ASCII representation. */
+    if (ip_addr)
+        rt_memcpy(ip_str, inet_ntoa(*ip_addr), IPADDR_SIZE);
+    else
+        rt_memcpy(ip_str, inet_ntoa(netdev->ip_addr), IPADDR_SIZE);
+
+    if (gw)
+        rt_memcpy(gw_str, inet_ntoa(*gw), IPADDR_SIZE);
+    else
+        rt_memcpy(gw_str, inet_ntoa(netdev->gw), IPADDR_SIZE);
+
+    if (netmask)
+        rt_memcpy(netmask_str, inet_ntoa(*netmask), IPADDR_SIZE);
+    else
+        rt_memcpy(netmask_str, inet_ntoa(netdev->netmask), IPADDR_SIZE);
+
+    /* send addr info set commond "AT+NIP=dhcptype,ip,gateway,netmask,dnsserver" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+NIP=%hhu,%s,%s,%s,%s",
+                        dhcp_stat, ip_str, gw_str, netmask_str, dns_str) < 0)
+    {
+        LOG_E("%s device set address failed.", device->name);
+        result = -RT_ERROR;
+    }
+    else
+    {
+        /* Update netdev information */
+        if (ip_addr)
+            netdev_low_level_set_ipaddr(netdev, ip_addr);
+
+        if (gw)
+            netdev_low_level_set_gw(netdev, gw);
+
+        if (netmask)
+            netdev_low_level_set_netmask(netdev, netmask);
+
+        LOG_D("%s device set address success.", device->name);
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int w60x_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char ip_str[IPADDR_SIZE] = {0};
+    char gw_str[IPADDR_SIZE] = {0};
+    char netmask_str[IPADDR_SIZE] = {0};
+    char dns_str[IPADDR_SIZE] = {0};
+    rt_uint8_t dhcp_stat = 0;
+    const char *resp_expr = "+OK=%d,%s,%s,%s,%s";
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(dns_server);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device by netdev(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 1, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* send DHCP query commond " AT+NIP" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+NIP") < 0)
+    {
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args(resp, 1, resp_expr, dhcp_stat, ip_str, netmask_str, gw_str, dns_str) <= 0)
+    {
+        LOG_E("%s device prase DHCP status error.", device->name);
+        goto __exit;
+    }
+
+    if (dns_server)
+        rt_memcpy(dns_str, inet_ntoa(*dns_server), IPADDR_SIZE);
+    else
+        rt_memcpy(dns_str, inet_ntoa(netdev->dns_servers), IPADDR_SIZE);
+
+    /* send addr info set commond "AT+NIP=dhcptype,ip,gateway,netmask,dnsserver" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+NIP=%hhu,%s,%s,%s,%s",
+                        dhcp_stat, ip_str, gw_str, netmask_str, dns_str) < 0)
+    {
+        LOG_E("%s device set DNS failed.", device->name);
+        result = -RT_ERROR;
+    }
+    else
+    {
+        netdev_low_level_set_dns_server(netdev, dns_num, dns_server);
+        LOG_D("%s device set DNS(%s) success.", device->name, inet_ntoa(*dns_server));
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int w60x_netdev_set_dhcp(struct netdev *netdev, rt_bool_t is_enabled)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char ip_str[IPADDR_SIZE] = {0};
+    char gw_str[IPADDR_SIZE] = {0};
+    char netmask_str[IPADDR_SIZE] = {0};
+    char dns_str[IPADDR_SIZE] = {0};
+    rt_uint8_t dhcp_stat = 0;
+    const char *resp_expr = "+OK=%d,%s,%s,%s,%s";
+
+    RT_ASSERT(netdev);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device by netdev(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 1, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp struct.");
+        return -RT_ENOMEM;
+    }
+
+    /* send DHCP query commond " AT+NIP" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+NIP") < 0)
+    {
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args(resp, 1, resp_expr, dhcp_stat, ip_str, netmask_str, gw_str, dns_str) <= 0)
+    {
+        LOG_E("%s device prase DHCP status error.", device->name);
+        goto __exit;
+    }
+
+    /* send addr info set commond "AT+NIP=dhcptype,ip,gateway,netmask,dnsserver" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+NIP=%hhu,%s,%s,%s,%s",
+                        is_enabled ? 0 : 1, ip_str, gw_str, netmask_str, dns_str) < 0)
+    {
+        LOG_E("%s device set DHCP status(%d) failed.", device->name, is_enabled);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    else
+    {
+        netdev_low_level_set_dhcp_status(netdev, is_enabled);
+        LOG_D("%s device set DHCP status(%d) ok.", device->name, is_enabled);
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+#ifdef NETDEV_USING_PING
+static int w60x_netdev_ping(struct netdev *netdev, const char *host,
+                size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp)
+{
+#define W60X_IP_SIZE         16
+
+    rt_err_t result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char ip_addr[W60X_IP_SIZE] = {0};
+    char *pos;
+
+    RT_ASSERT(netdev);
+    RT_ASSERT(host);
+    RT_ASSERT(ping_resp);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(256, 1, timeout);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    at_obj_set_end_sign(device->client, '\r');
+
+    /* send domain commond "AT+SKGHBN=<domain name>" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+SKGHBN=%s", host) < 0)
+    {
+        LOG_E("AT+SKGHBN failed.");
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    /* parse the third line of response data, get the IP address */
+    pos = rt_strstr(resp->buf, "+OK=");
+    if (!pos)
+    {
+        LOG_E("AT+SKGHBN resp error.");
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    sscanf(pos, "+OK=\"%[^\"]\"", ip_addr);
+
+    inet_aton(ip_addr, &(ping_resp->ip_addr));
+    ping_resp->data_len = data_len;
+    ping_resp->ttl = 0;
+    ping_resp->ticks = 0;
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+#endif /* NETDEV_USING_PING */
+
+#ifdef NETDEV_USING_NETSTAT
+void w60x_netdev_netstat(struct netdev *netdev)
+{
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+ 
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", netdev->name);
+        return;
+    }
+
+    resp = at_create_resp(128, 1, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.", device->name);
+        goto __exit;
+    }
+
+    /* send network connection information commond "AT+LKSTT" and wait response */
+    if (at_obj_exec_cmd(device->client, resp, "AT+LKSTT") < 0)
+    {
+        goto __exit;
+    }
+
+    LOG_RAW("%s\n", at_resp_get_line(resp, 1));
+
+    /* maybe query "AT+SKSTT"... */
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+}
+#endif /* NETDEV_USING_NETSTAT */
+
+static const struct netdev_ops w60x_netdev_ops =
+{
+    w60x_netdev_set_up,
+    w60x_netdev_set_down,
+
+    w60x_netdev_set_addr_info,
+    w60x_netdev_set_dns_server,
+    w60x_netdev_set_dhcp,
+
+#ifdef NETDEV_USING_PING
+    w60x_netdev_ping,
+#endif
+#ifdef NETDEV_USING_NETSTAT
+    w60x_netdev_netstat,
+#endif
+};
+
+static struct netdev *w60x_netdev_add(const char *netdev_name)
+{
+#define ETHERNET_MTU        1500
+#define HWADDR_LEN          6
+    struct netdev *netdev = RT_NULL;
+
+    RT_ASSERT(netdev_name);
+
+    netdev = (struct netdev *) rt_calloc(1, sizeof(struct netdev));
+    if (netdev == RT_NULL)
+    {
+        LOG_E("no memory for netdev create.");
+        return RT_NULL;
+    }
+
+    netdev->mtu = ETHERNET_MTU;
+    netdev->ops = &w60x_netdev_ops;
+    netdev->hwaddr_len = HWADDR_LEN;
+
+#ifdef SAL_USING_AT
+    extern int sal_at_netdev_set_pf_info(struct netdev *netdev);
+    /* set the network interface socket/netdb operations */
+    sal_at_netdev_set_pf_info(netdev);
+#endif
+
+    netdev_register(netdev, netdev_name, RT_NULL);
+
+    return netdev;
+}
+
+/* =============================  w60x device operations ============================= */
+
+#define AT_SEND_CMD(client, resp, cmd)                                     \
+    do {                                                                   \
+        (resp) = at_resp_set_info((resp), 256, 1, 3 * RT_TICK_PER_SECOND); \
+        if (at_obj_exec_cmd((client), (resp), (cmd)) < 0)                  \
+        {                                                                  \
+            result = -RT_ERROR;                                            \
+            goto __exit;                                                   \
+        }                                                                  \
+    } while(0)                                                             \
+
+static void w60x_netdev_start_delay_work(struct at_device *device)
+{
+    struct rt_delayed_work *net_work = RT_NULL;
+    net_work = (struct rt_delayed_work *)rt_calloc(1, sizeof(struct rt_delayed_work));
+    if (net_work == RT_NULL)
+    {
+        return;
+    }
+
+    rt_delayed_work_init(net_work, w60x_get_netdev_info, (void *)device);
+    rt_work_submit(&(net_work->work), RT_TICK_PER_SECOND);
+}
+
+static void w60x_init_thread_entry(void *parameter)
+{
+#define INIT_RETRY    5
+
+    struct at_device *device = (struct at_device *) parameter;
+    struct at_device_w60x *w60x = (struct at_device_w60x *) device->user_data;
+    struct at_client *client = device->client;
+    at_response_t resp = RT_NULL;
+    rt_err_t result = RT_EOK;
+    rt_size_t i = 0, retry_num = INIT_RETRY;
+    rt_bool_t wifi_is_conn = RT_FALSE;
+    rt_uint8_t atcmd_str[128];
+
+    LOG_D("%s device initialize start.", device->name);
+
+    /* wait w60x device startup finish */
+    rt_thread_mdelay(1000);
+
+    resp = at_create_resp(256, 1, 3 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return;
+    }
+
+    while (retry_num--)
+    {
+        /* reset module */
+        AT_SEND_CMD(client, resp, "AT+Z");
+        /* reset waiting delay */
+        rt_thread_mdelay(1000);
+        /* get module version */
+        AT_SEND_CMD(client, resp, "AT+QVER");
+        /* show module version */
+        for (i = 0; i < resp->line_counts - 1; i++)
+        {
+            LOG_D("%s", at_resp_get_line(resp, i + 1));
+        }
+
+        /* initialize successfully  */
+        result = RT_EOK;
+        break;
+
+    __exit:
+        if (result != RT_EOK)
+        {
+            rt_thread_mdelay(1000);
+            LOG_I("%s device initialize retry...", device->name);
+        }
+    }
+
+    /* set current mode to Wi-Fi station */
+    rt_sprintf(atcmd_str, "AT+WPRT=%d", 0);
+    AT_SEND_CMD(client, resp, atcmd_str);
+    rt_sprintf(atcmd_str, "AT+SSID=\"%s\"", w60x->wifi_ssid);
+    AT_SEND_CMD(client, resp, atcmd_str);
+    rt_sprintf(atcmd_str, "AT+KEY=1,0,\"%s\"", w60x->wifi_password);
+    AT_SEND_CMD(client, resp, atcmd_str);
+    AT_SEND_CMD(client, resp, "AT+PMTF");
+
+    /* connect to WiFi AP */
+    w60x_is_join_start = RT_TRUE;
+    if (at_obj_exec_cmd(client, at_resp_set_info(resp, 128, 1, 20 * RT_TICK_PER_SECOND),
+                        "AT+WJOIN") != RT_EOK)
+    {
+        LOG_W("%s device wifi connect failed, check ssid(%s) and password(%s).",
+              device->name, w60x->wifi_ssid, w60x->wifi_password);
+        w60x_is_join_start = RT_FALSE;
+    }
+    else
+    {
+        wifi_is_conn = RT_TRUE;
+    }
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (result != RT_EOK)
+    {
+        netdev_low_level_set_status(device->netdev, RT_FALSE);
+        LOG_E("%s device network initialize failed(%d).", device->name, result);
+    }
+    else
+    {
+        device->is_init = RT_TRUE;
+        netdev_low_level_set_status(device->netdev, RT_TRUE);
+        if (wifi_is_conn)
+        {
+            netdev_low_level_set_link_status(device->netdev, RT_TRUE);
+        }
+        w60x_netdev_start_delay_work(device);
+        LOG_I("%s device network initialize successfully.", device->name);
+    }
+}
+
+static int w60x_net_init(struct at_device *device)
+{
+#ifdef AT_DEVICE_W60X_INIT_ASYN
+    rt_thread_t tid;
+
+    tid = rt_thread_create("w60x_net", w60x_init_thread_entry, (void *) device,
+            W60X_THREAD_STACK_SIZE, W60X_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("create %s device init thread failed.", device->name);
+        return -RT_ERROR;
+    }
+#else
+    w60x_init_thread_entry(device);
+#endif /* AT_DEVICE_W60X_INIT_ASYN */
+
+    return RT_EOK;
+}
+
+static void urc_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+
+    RT_ASSERT(client && data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    if (w60x_is_join_start && !rt_strncmp(data, "+OK=", rt_strlen("+OK=")))
+    {
+        w60x_is_join_start = RT_FALSE;
+    
+        LOG_I("%s device wifi is connected.", device->name);
+
+        if (device->is_init)
+        {
+            netdev_low_level_set_link_status(device->netdev, RT_TRUE);
+
+            w60x_netdev_start_delay_work(device);
+        }
+    }
+    else if (w60x_is_join_start && !rt_strncmp(data, "+ERR=", rt_strlen("+ERR=")))
+    {
+        w60x_is_join_start = RT_FALSE;
+
+        LOG_I("%s device wifi is disconnect.", device->name);
+
+        if (device->is_init)
+        {
+            netdev_low_level_set_link_status(device->netdev, RT_FALSE);
+        }
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"+OK=",  "\r\n", urc_func},
+    {"+ERR=", "\r\n", urc_func},
+};
+
+static int w60x_init(struct at_device *device)
+{
+    struct at_device_w60x *w60x = (struct at_device_w60x *) device->user_data;
+
+    /* initialize AT client */
+    at_client_init(w60x->client_name, w60x->recv_line_num);
+
+    device->client = at_client_get(w60x->client_name);
+    if (device->client == RT_NULL)
+    {
+        LOG_E("get AT client(%s) failed.", w60x->client_name);
+        return -RT_ERROR;
+    }
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+#ifdef AT_USING_SOCKET
+    w60x_socket_init(device);
+#endif
+
+    /* add w60x device to the netdev list */
+    device->netdev = w60x_netdev_add(w60x->device_name);
+    if (device->netdev == RT_NULL)
+    {
+        LOG_E("add netdev(%s) failed.", w60x->device_name);
+        return -RT_ERROR;
+    }
+
+    /* initialize w60x device network */
+    return w60x_netdev_set_up(device->netdev);
+}
+
+static int w60x_deinit(struct at_device *device)
+{
+    return w60x_netdev_set_down(device->netdev);
+}
+
+/* reset w60x device and initialize device network again */
+static int w60x_reset(struct at_device *device)
+{
+    int result = RT_EOK;
+    struct at_client *client = device->client;
+
+    /* send "AT+Z" commonds to w60x device */
+    result = at_obj_exec_cmd(client, RT_NULL, "AT+Z");
+    rt_thread_mdelay(1000);
+
+    /* waiting 10 seconds for w60x device reset */
+    device->is_init = RT_FALSE;
+    rt_thread_mdelay(1000);
+
+    /* initialize w60x device network */
+    w60x_net_init(device);
+
+    device->is_init = RT_TRUE;
+
+    return result;
+}
+
+/* change w60x wifi ssid and password information */
+static int w60x_wifi_info_set(struct at_device *device, struct at_device_ssid_pwd *info)
+{
+    int result = RT_EOK;
+    struct at_response *resp = RT_NULL;
+    rt_uint8_t atcmd_str[128];
+
+    if (info->ssid == RT_NULL || info->password == RT_NULL)
+    {
+        LOG_E("input wifi ssid(%s) and password(%s) error.", info->ssid, info->password);
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 1, 20 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    /* set current mode to Wi-Fi station */
+    rt_sprintf(atcmd_str, "AT+WPRT=%d", 0);
+    AT_SEND_CMD(device->client, resp, atcmd_str);
+    rt_sprintf(atcmd_str, "AT+SSID=\"%s\"", info->ssid);
+    AT_SEND_CMD(device->client, resp, atcmd_str);
+    rt_sprintf(atcmd_str, "AT+KEY=1,0,\"%s\"", info->password);
+    AT_SEND_CMD(device->client, resp, atcmd_str);
+    AT_SEND_CMD(device->client, resp, "AT+PMTF");
+
+    /* connect to input wifi ap */
+    w60x_is_join_start = RT_TRUE;
+    if (at_obj_exec_cmd(device->client, resp, "AT+WJOIN") != RT_EOK)
+    {
+        LOG_E("%s device wifi connect failed, check ssid(%s) and password(%s).",
+              device->name, info->ssid, info->password);
+        result = -RT_ERROR;
+        w60x_is_join_start = RT_FALSE;
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+static int w60x_control(struct at_device *device, int cmd, void *arg)
+{
+    int result = -RT_ERROR;
+
+    RT_ASSERT(device);
+
+    switch (cmd)
+    {
+    case AT_DEVICE_CTRL_POWER_ON:
+    case AT_DEVICE_CTRL_POWER_OFF:
+    case AT_DEVICE_CTRL_LOW_POWER:
+    case AT_DEVICE_CTRL_SLEEP:
+    case AT_DEVICE_CTRL_WAKEUP:
+    case AT_DEVICE_CTRL_NET_CONN:
+    case AT_DEVICE_CTRL_NET_DISCONN:
+    case AT_DEVICE_CTRL_GET_SIGNAL:
+    case AT_DEVICE_CTRL_GET_GPS:
+    case AT_DEVICE_CTRL_GET_VER:
+        LOG_W("not support the control cmd(%d).", cmd);
+        break;
+    case AT_DEVICE_CTRL_RESET:
+        result = w60x_reset(device);
+        break;
+    case AT_DEVICE_CTRL_SET_WIFI_INFO:
+        result = w60x_wifi_info_set(device, (struct at_device_ssid_pwd *) arg);
+        break;
+    default:
+        LOG_E("input error control cmd(%d).", cmd);
+        break;
+    }
+
+    return result;
+}
+
+static const struct at_device_ops w60x_device_ops =
+{
+    w60x_init,
+    w60x_deinit,
+    w60x_control,
+};
+
+static int w60x_device_class_register(void)
+{
+    struct at_device_class *class = RT_NULL;
+
+    class = (struct at_device_class *) rt_calloc(1, sizeof(struct at_device_class));
+    if (class == RT_NULL)
+    {
+        LOG_E("no memory for class create.");
+        return -RT_ENOMEM;
+    }
+
+    /* fill W60X device class object */
+#ifdef AT_USING_SOCKET
+    w60x_socket_class_register(class);
+#endif
+    class->device_ops = &w60x_device_ops;
+
+    return at_device_class_register(class, AT_DEVICE_CLASS_W60X);
+}
+INIT_DEVICE_EXPORT(w60x_device_class_register);
+
+#endif /* AT_DEVICE_USING_W60X */

class/w60x/at_device_w60x.h

@@ -0,0 +1,66 @@
+/*
+ * File      : at_device_w60x.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-16     chenyong     first version
+ */
+
+#ifndef __AT_DEVICE_W60X_H__
+#define __AT_DEVICE_W60X_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include <at_device.h>
+
+/* The maximum number of sockets supported by the w60x device */
+#define AT_DEVICE_W60X_SOCKETS_NUM  20
+
+struct at_device_w60x
+{
+    char *device_name;
+    char *client_name;
+
+    char *wifi_ssid;
+    char *wifi_password;
+    size_t recv_line_num;
+    struct at_device device;
+
+    void *user_data;
+};
+
+#ifdef AT_USING_SOCKET
+
+/* w60x device socket initialize */
+int w60x_socket_init(struct at_device *device);
+
+/* w60x device class socket register */
+int w60x_socket_class_register(struct at_device_class *class);
+
+#endif /* AT_USING_SOCKET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __AT_DEVICE_W60X_H__ */

class/w60x/at_socket_w60x.c

@@ -0,0 +1,469 @@
+/*
+ * File      : at_socket_w60x.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-06-20     chenyong     first version
+ * 2019-05-09     chenyong     multi AT socket client support
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <at_device_w60x.h>
+
+#define LOG_TAG                       "at.skt.w60x"
+#include <at_log.h>
+
+#if defined(AT_DEVICE_USING_W60X) && defined(AT_USING_SOCKET)
+
+#define W60X_MODULE_SEND_MAX_SIZE   512
+
+static rt_int32_t w60x_socket_fd[AT_DEVICE_W60X_SOCKETS_NUM] = {-1};
+
+static at_evt_cb_t at_evt_cb_set[] = {
+        [AT_SOCKET_EVT_RECV] = NULL,
+        [AT_SOCKET_EVT_CLOSED] = NULL,
+};
+
+/**
+ * close socket by AT commands.
+ *
+ * @param current socket
+ *
+ * @return  0: close socket success
+ *         -1: send AT commands error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int w60x_socket_close(struct at_socket *socket)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+
+    resp = at_create_resp(64, 1, rt_tick_from_millisecond(300));
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    at_obj_set_end_sign(device->client, '\r');
+
+    result = at_obj_exec_cmd(device->client, resp, "AT+SKCLS=%d", w60x_socket_fd[device_socket]);
+    w60x_socket_fd[device_socket] = -1;
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * create TCP/UDP client or server connect by AT commands.
+ *
+ * @param socket current socket
+ * @param ip server or client IP address
+ * @param port server or client port
+ * @param type connect socket type(tcp, udp)
+ * @param is_client connection is client
+ *
+ * @return   0: connect success
+ *          -1: connect failed, send commands error or type error
+ *          -2: wait socket event timeout
+ *          -5: no memory
+ */
+static int w60x_socket_connect(struct at_socket *socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    int socket_fd = -1;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    resp = at_create_resp(64, 1, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    at_obj_set_end_sign(device->client, '\r');
+
+    /* send the "AT+SKRPTM" commands */
+    if (at_obj_exec_cmd(device->client, resp, "AT+SKRPTM=1") < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    switch (type)
+    {
+        case AT_SOCKET_TCP:
+            /* send AT commands */
+            if (at_obj_exec_cmd(device->client, resp,
+                                "AT+SKCT=0,%d,%s,%d", is_client ? 0 : 1, is_client ? ip : 0, port) < 0)
+            {
+                result = -RT_ERROR;
+            }
+            break;
+
+        case AT_SOCKET_UDP:
+            if (at_obj_exec_cmd(device->client, resp,
+                                "AT+SKCT=1,%d,%s,%d", is_client ? 0 : 1, is_client ? ip : 0, port) < 0)
+            {
+                result = -RT_ERROR;
+            }
+            break;
+
+        default:
+            LOG_E("not supported connect type %d.", type);
+            result = -RT_ERROR;
+            goto __exit;
+    }
+
+    if ((result != RT_EOK) || !rt_strstr(at_resp_get_line(resp, 1), "+OK="))
+    {
+        LOG_D("%s device socket connect failed.", device->name);
+        goto __exit;
+    }
+
+    socket_fd = atoi(rt_strstr(at_resp_get_line(resp, 1), "+OK=") + rt_strlen("+OK="));
+    w60x_socket_fd[device_socket] = socket_fd;
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * send data to server or client by AT commands.
+ *
+ * @param socket current socket
+ * @param buff send buffer
+ * @param bfsz send buffer size
+ * @param type connect socket type(tcp, udp)
+ *
+ * @return >=0: the size of send success
+ *          -1: send AT commands error or send data error
+ *          -2: waited socket event timeout
+ *          -5: no memory
+ */
+static int w60x_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    int result = RT_EOK;
+    size_t cur_pkt_size = 0, sent_size = 0;
+    at_response_t resp = RT_NULL;
+    int device_socket = (int) socket->user_data;
+    struct at_device *device = (struct at_device *) socket->device;
+    struct at_device_w60x *w60x = (struct at_device_w60x *) device->user_data;
+    rt_mutex_t lock = device->client->lock;
+
+    RT_ASSERT(buff);
+    RT_ASSERT(bfsz > 0);
+
+    resp = at_create_resp(128, 1, 5 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(lock, RT_WAITING_FOREVER);
+
+    /* set current socket for send URC event */
+    w60x->user_data = (void *) device_socket;
+
+    /* set AT client end sign to deal with '\n' sign */
+    at_obj_set_end_sign(device->client, '\n');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < W60X_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = W60X_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+SKSND" commands */
+        if (at_obj_exec_cmd(device->client, resp, "AT+SKSND=%d,%d", w60x_socket_fd[device_socket], cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (!rt_strstr(at_resp_get_line(resp, 1), "+OK="))
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* send the real data to server or client */
+        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data */
+    at_obj_set_end_sign(device->client, 0);
+
+    rt_mutex_release(lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result > 0 ? sent_size : result;
+}
+
+/**
+ * domain resolve by AT commands.
+ *
+ * @param name domain name
+ * @param ip parsed IP address, it's length must be 16
+ *
+ * @return  0: domain resolve success
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int w60x_domain_resolve(const char *name, char ip[16])
+{
+#define RESOLVE_RETRY        5
+
+    int i, result = RT_EOK;
+    char recv_ip[16] = { 0 };
+    at_response_t resp = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *pos;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    device = at_device_get_first_initialized();
+    if (device == RT_NULL)
+    {
+        LOG_E("get first init device failed.");
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(128, 1, 20 * RT_TICK_PER_SECOND);
+    if (resp == RT_NULL)
+    {
+        LOG_E("no memory for resp create.");
+        return -RT_ENOMEM;
+    }
+
+    at_obj_set_end_sign(device->client, '\r');
+
+    for (i = 0; i < RESOLVE_RETRY; i++)
+    {
+        if (at_obj_exec_cmd(device->client, resp, "AT+SKGHBN=%s", name) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* parse the third line of response data, get the IP address */
+        pos = rt_strstr(resp->buf, "+OK=");
+        if (!pos)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+
+        sscanf(pos, "+OK=\"%[^\"]\"", recv_ip);
+
+        if (rt_strlen(recv_ip) < 8)
+        {
+            rt_thread_mdelay(100);
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+        else
+        {
+            rt_strncpy(ip, recv_ip, 15);
+            ip[15] = '\0';
+            break;
+        }
+    }
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void w60x_socket_set_event_cb(at_socket_evt_t event, at_evt_cb_t cb)
+{
+    if (event < sizeof(at_evt_cb_set) / sizeof(at_evt_cb_set[1]))
+    {
+        at_evt_cb_set[event] = cb;
+    }
+}
+
+static const struct at_socket_ops w60x_socket_ops =
+{
+    w60x_socket_connect,
+    w60x_socket_close,
+    w60x_socket_send,
+    w60x_domain_resolve,
+    w60x_socket_set_event_cb,
+};
+
+static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
+{
+    int device_socket = 0;
+    rt_int32_t timeout = 0;
+    rt_size_t bfsz = 0, temp_size = 0;
+    char *recv_buf = RT_NULL, temp[8] = {0};
+    struct at_socket *socket = RT_NULL;
+    struct at_device *device = RT_NULL;
+    char *client_name = client->device->parent.name;
+    char recv_ip[16] = { 0 };
+    rt_int32_t recv_port = 0;
+    rt_uint8_t i;
+    char *pos;
+
+    RT_ASSERT(data && size);
+
+    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
+    if (device == RT_NULL)
+    {
+        LOG_E("get device(%s) failed.", client_name);
+        return;
+    }
+
+    /* get the at deveice socket and receive buffer size by receive data */
+    pos = rt_strstr(data, "+SKTRPT=");
+    sscanf(pos, "+SKTRPT=%d,%d,%[^,],%d", &device_socket, (int *) &bfsz, recv_ip, &recv_port);
+
+    for (i = 0; i < AT_DEVICE_W60X_SOCKETS_NUM; i++)
+    {
+        if (device_socket == w60x_socket_fd[i])
+        {
+            device_socket = i;
+            break;
+        }
+    }
+
+    /* set receive timeout by receive buffer length, not less than 10ms */
+    timeout = bfsz > 10 ? bfsz : 10;
+
+    if (device_socket < 0 || bfsz == 0)
+        return;
+
+    recv_buf = (char *) rt_calloc(1, bfsz);
+    if (recv_buf == RT_NULL)
+    {
+        LOG_E("no memory receive buffer(%d).", bfsz);
+        /* read and clean the coming data */
+        while (temp_size < bfsz)
+        {
+            if (bfsz - temp_size > sizeof(temp))
+            {
+                at_client_obj_recv(client, temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_obj_recv(client, recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("%s device receive size(%d) data failed.", device->name, bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* get at socket object by device socket descriptor */
+    socket = &(device->sockets[device_socket]);
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+static const struct at_urc urc_table[] =
+{
+    {"+SKTRPT=",     "\r", urc_recv_func},
+    {"\r\n+SKTRPT=", "\r", urc_recv_func},
+    {"\r+SKTRPT=",   "\r", urc_recv_func},
+    {"\n+SKTRPT=",   "\r", urc_recv_func},
+};
+
+int w60x_socket_init(struct at_device *device)
+{
+    RT_ASSERT(device);
+
+    /* register URC data execution function  */
+    at_obj_set_urc_table(device->client, urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    return RT_EOK;
+}
+
+int w60x_socket_class_register(struct at_device_class *class)
+{
+    RT_ASSERT(class);
+
+    class->socket_num = AT_DEVICE_W60X_SOCKETS_NUM;
+    class->socket_ops = &w60x_socket_ops;
+
+    return RT_EOK;
+}
+
+#endif /* AT_DEVICE_USING_W60X && AT_USING_SOCKET */

inc/at_device.h

@@ -1,4 +1,4 @@
-/*
+	/*
  * File      : at_device.h
  * This file is part of RT-Thread RTOS
  * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
@@ -40,8 +40,8 @@ extern "C" {
 #include <netdev.h>
 #endif /* RT_USING_NETDEV */
 
-#define AT_DEVICE_SW_VERSION           "2.0.1"
+#define AT_DEVICE_SW_VERSION           "2.0.3"
-#define AT_DEVICE_SW_VERSION_NUM       0x20001
+#define AT_DEVICE_SW_VERSION_NUM       0x20003
 
 /* AT device class ID */
 #define AT_DEVICE_CLASS_ESP8266        0x01U
@@ -51,6 +51,15 @@ extern "C" {
 #define AT_DEVICE_CLASS_SIM76XX        0x05U
 #define AT_DEVICE_CLASS_RW007          0x06U
 #define AT_DEVICE_CLASS_MW31           0x07U
+#define AT_DEVICE_CLASS_ESP32          0x08U
+#define AT_DEVICE_CLASS_W60X           0x09U
+#define AT_DEVICE_CLASS_A9G            0x0AU
+#define AT_DEVICE_CLASS_BC26           0x0BU
+#define AT_DEVICE_CLASS_AIR720         0x0CU
+#define AT_DEVICE_CLASS_ME3616         0x0DU
+#define AT_DEVICE_CLASS_M6315          0x0EU
+#define AT_DEVICE_CLASS_BC28           0x0FU
+#define AT_DEVICE_CLASS_EC200X         0x10U
 
 /* Options and Commands for AT device control opreations */
 #define AT_DEVICE_CTRL_POWER_ON        0x01L

samples/at_sample_a9g.c

@@ -0,0 +1,52 @@
+/*
+ * File      : at_sample_a9g.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-11-23     luliang     first version
+ */
+
+#include <at_device_a9g.h>
+
+#define LOG_TAG                   "at.sample.a9g"
+#include <at_log.h>
+
+#define A9G_SAMPLE_DEIVCE_NAME     "a9g0"
+
+static struct at_device_a9g a9g0 =
+{
+    A9G_SAMPLE_DEIVCE_NAME,
+    A9G_SAMPLE_CLIENT_NAME,
+
+    A9G_SAMPLE_POWER_PIN,
+    A9G_SAMPLE_STATUS_PIN,
+    A9G_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int a9g_device_register(void)
+{
+    struct at_device_a9g *a9g = &a9g0;
+
+    return at_device_register(&(a9g->device),
+                              a9g->device_name,
+                              a9g->client_name,
+                              AT_DEVICE_CLASS_A9G,
+                              (void *) a9g);
+}
+INIT_APP_EXPORT(a9g_device_register);

samples/at_sample_air720.c

@@ -0,0 +1,53 @@
+/*
+ * File      : at_sample_air720.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-12-07     liang.shao     first version
+ */
+
+#include <at_device_air720.h>
+
+#define LOG_TAG                        "at.sample"
+#include <at_log.h>
+
+#define AIR720_SAMPLE_DEIVCE_NAME     "air720"
+
+static struct at_device_air720 sim0 =
+{
+    AIR720_SAMPLE_DEIVCE_NAME,
+    AIR720_SAMPLE_CLIENT_NAME,
+
+    AIR720_SAMPLE_POWER_PIN,
+    AIR720_SAMPLE_STATUS_PIN,
+    AIR720_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int air720_device_register(void)
+{
+    struct at_device_air720 *air720 = &sim0;
+    
+    return at_device_register(&(air720->device),
+                              air720->device_name,
+                              air720->client_name,
+                              AT_DEVICE_CLASS_AIR720,
+                              (void *) air720);
+}
+INIT_APP_EXPORT(air720_device_register);
+//MSH_CMD_EXPORT(air720_device_register,air720_device_register);

samples/at_sample_bc26.c

@@ -0,0 +1,53 @@
+/*
+ * File      : at_sample_bc26.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2019-12-13     qiyongzhong       first version
+ */
+
+#include <at_device_bc26.h>
+
+#define LOG_TAG                        "at.sample.bc26"
+#include <at_log.h>
+
+#define BC26_SAMPLE_DEIVCE_NAME        "bc26"
+
+static struct at_device_bc26 _dev =
+{
+    BC26_SAMPLE_DEIVCE_NAME,
+    BC26_SAMPLE_CLIENT_NAME,
+
+    BC26_SAMPLE_POWER_PIN,
+    BC26_SAMPLE_STATUS_PIN,
+    BC26_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int bc26_device_register(void)
+{
+    struct at_device_bc26 *bc26 = &_dev;
+
+    return at_device_register(&(bc26->device),
+                              bc26->device_name,
+                              bc26->client_name,
+                              AT_DEVICE_CLASS_BC26,
+                              (void *) bc26);
+}
+INIT_APP_EXPORT(bc26_device_register);
+

samples/at_sample_bc28.c

@@ -0,0 +1,53 @@
+/*
+ * File      : at_sample_bc28.c
+ * This file is part of RT-Thread RTOS
+ * Copyright (c) 2020, RudyLo <luhuadong@163.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-02-13     luhuadong         first version
+ */
+
+#include <at_device_bc28.h>
+
+#define LOG_TAG                        "at.sample.bc28"
+#include <at_log.h>
+
+#define BC28_SAMPLE_DEIVCE_NAME        "bc28"
+
+static struct at_device_bc28 _dev =
+{
+    BC28_SAMPLE_DEIVCE_NAME,
+    BC28_SAMPLE_CLIENT_NAME,
+
+    BC28_SAMPLE_POWER_PIN,
+    BC28_SAMPLE_STATUS_PIN,
+    BC28_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int bc28_device_register(void)
+{
+    struct at_device_bc28 *bc28 = &_dev;
+
+    return at_device_register(&(bc28->device),
+                              bc28->device_name,
+                              bc28->client_name,
+                              AT_DEVICE_CLASS_BC28,
+                              (void *) bc28);
+}
+INIT_APP_EXPORT(bc28_device_register);
+

samples/at_sample_ec200x.c

@@ -0,0 +1,54 @@
+/*
+ * File      : at_sample_ec200x.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2019-12-13     qiyongzhong       first version
+ */
+
+#include <at_device_ec200x.h>
+
+#define LOG_TAG                        "at.sample.ec200x"
+#include <at_log.h>
+
+#define EC200X_SAMPLE_DEIVCE_NAME        "ec200x"
+
+static struct at_device_ec200x _dev =
+{
+    EC200X_SAMPLE_DEIVCE_NAME,
+    EC200X_SAMPLE_CLIENT_NAME,
+
+    EC200X_SAMPLE_POWER_PIN,
+    EC200X_SAMPLE_STATUS_PIN,
+    EC200X_SAMPLE_WAKEUP_PIN,
+    EC200X_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int ec200x_device_register(void)
+{
+    struct at_device_ec200x *ec200x = &_dev;
+
+    return at_device_register(&(ec200x->device),
+                              ec200x->device_name,
+                              ec200x->client_name,
+                              AT_DEVICE_CLASS_EC200X,
+                              (void *) ec200x);
+}
+INIT_APP_EXPORT(ec200x_device_register);
+

samples/at_sample_esp32.c

@@ -0,0 +1,52 @@
+/*
+ * File      : at_sample_esp32.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-10     chenyong     first version
+ */
+
+#include <at_device_esp32.h>
+
+#define LOG_TAG                        "at.sample.esp"
+#include <at_log.h>
+
+#define ESP32_SAMPLE_DEIVCE_NAME     "esp32"
+
+static struct at_device_esp32 esp0 =
+{
+    ESP32_SAMPLE_DEIVCE_NAME,
+    ESP32_SAMPLE_CLIENT_NAME,
+
+    ESP32_SAMPLE_WIFI_SSID,
+    ESP32_SAMPLE_WIFI_PASSWORD,
+    ESP32_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int esp32_device_register(void)
+{
+    struct at_device_esp32 *esp32 = &esp0;
+
+    return at_device_register(&(esp32->device),
+                              esp32->device_name,
+                              esp32->client_name,
+                              AT_DEVICE_CLASS_ESP32,
+                              (void *) esp32);
+}
+INIT_APP_EXPORT(esp32_device_register);

samples/at_sample_m6315.c

@@ -0,0 +1,52 @@
+/*
+ * File      : at_sample_m6315.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-13     chenyong     first version
+ */
+
+#include <at_device_m6315.h>
+
+#define LOG_TAG                        "at.sample.m6315"
+#include <at_log.h>
+
+#define M6315_SAMPLE_DEIVCE_NAME     "m6315"
+
+static struct at_device_m6315 m6315_dev =
+{
+    M6315_SAMPLE_DEIVCE_NAME,
+    M6315_SAMPLE_CLIENT_NAME,
+
+    M6315_SAMPLE_POWER_PIN,
+    M6315_SAMPLE_STATUS_PIN,
+    M6315_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int m6315_device_register(void)
+{
+    struct at_device_m6315 *m6315 = &m6315_dev;
+
+    return at_device_register(&(m6315->device),
+                              m6315->device_name,
+                              m6315->client_name,
+                              AT_DEVICE_CLASS_M6315,
+                              (void *) m6315);
+}
+INIT_APP_EXPORT(m6315_device_register);

samples/at_sample_me3616.c

@@ -0,0 +1,53 @@
+/*
+ * File      : at_sample_me3616.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2019-12-30     qiyongzhong       first version
+ */
+
+#include <at_device_me3616.h>
+
+#define LOG_TAG                        "at.sample.me3616"
+#include <at_log.h>
+
+#define ME3616_SAMPLE_DEIVCE_NAME        "me3616"
+
+static struct at_device_me3616 _dev =
+{
+    ME3616_SAMPLE_DEIVCE_NAME,
+    ME3616_SAMPLE_CLIENT_NAME,
+
+    ME3616_SAMPLE_POWER_PIN,
+    ME3616_SAMPLE_STATUS_PIN,
+    ME3616_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int me3616_device_register(void)
+{
+    struct at_device_me3616 *me3616 = &_dev;
+
+    return at_device_register(&(me3616->device),
+                              me3616->device_name,
+                              me3616->client_name,
+                              AT_DEVICE_CLASS_ME3616,
+                              (void *) me3616);
+}
+INIT_APP_EXPORT(me3616_device_register);
+

samples/at_sample_w60x.c

@@ -0,0 +1,52 @@
+/*
+ * File      : at_sample_w60x.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-10     chenyong     first version
+ */
+
+#include <at_device_w60x.h>
+
+#define LOG_TAG                        "at.sample.w60x"
+#include <at_log.h>
+
+#define W60X_SAMPLE_DEIVCE_NAME     "w60x0"
+
+static struct at_device_w60x w60x0 =
+{
+    W60X_SAMPLE_DEIVCE_NAME,
+    W60X_SAMPLE_CLIENT_NAME,
+
+    W60X_SAMPLE_WIFI_SSID,
+    W60X_SAMPLE_WIFI_PASSWORD,
+    W60X_SAMPLE_RECV_BUFF_LEN,
+};
+
+static int w60x_device_register(void)
+{
+    struct at_device_w60x *w60x = &w60x0;
+
+    return at_device_register(&(w60x->device),
+                              w60x->device_name,
+                              w60x->client_name,
+                              AT_DEVICE_CLASS_W60X,
+                              (void *) w60x);
+}
+INIT_APP_EXPORT(w60x_device_register);