diff --git a/README.md b/README.md
index 579f56a..1c9897c 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ AT device 软件包是由 RT-Thread AT 组件针对不同 AT 设备的移植文
 | at_socket_esp8266.c  |  ESP8266 模块针对 AT 组件的移植文件，实现 AT socket |
 | at_socket_rw007.c  |  RW007 模块针对 AT 组件的移植文件，实现 AT socket |
 | at_socket_sim800c.c  |  SIM800C 模块针对 AT 组件的移植文件，实现 AT socket |
+| at_socket_sim76xx.c  |  SIM76XX 模块针对 AT 组件的移植文件，实现 AT socket |
 | at_socket_m26.c | M26/MC20 模块针对 AT 组件的移植文件，实现 AT socket |
 | at_socket_ec20.c | EC20 模块针对 AT 组件的移植文件，实现 AT socket |
 | at_client_sample.c | ESP8266 模块 AT Client 功能示例文件 |
@@ -59,4 +60,4 @@ AT device 软件包是对 AT 组件库和 AT socket 功能的移植，需开启
 ## 5. 联系方式
 
 * 维护：RT-Thread 开发团队及社区开发者
-* 主页：https://github.com/RT-Thread-packages/at_device
\ No newline at end of file
+* 主页：https://github.com/RT-Thread-packages/at_device
diff --git a/SConscript b/SConscript
index 7b9ceaa..4d20382 100644
--- a/SConscript
+++ b/SConscript
@@ -19,6 +19,9 @@ if GetDepend(['AT_DEVICE_RW007']):
 if GetDepend(['AT_DEVICE_SIM800C']):
     src += Glob('at_socket_sim800c.c')
 
+if GetDepend(['AT_DEVICE_SIM76XX']):
+    src += Glob('at_socket_sim76xx.c')
+
 if GetDepend(['AT_DEVICE_NOT_SELECTED']):
    src = Glob('*.c')
 
diff --git a/at_socket_sim76xx.c b/at_socket_sim76xx.c
new file mode 100755
index 0000000..51eaeb5
--- /dev/null
+++ b/at_socket_sim76xx.c
@@ -0,0 +1,1116 @@
+/*
+ * File      : at_socket_sim76xx.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
+ * 2018-12-22    thomasonegd  first version
+ */
+
+#include <at.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <rtthread.h>
+#include <sys/socket.h>
+
+#include <at_socket.h>
+
+#if !defined(AT_SW_VERSION_NUM) || AT_SW_VERSION_NUM < 0x10200
+#error "This AT Client version is older, please check and update latest AT Client!"
+#endif
+
+#define LOG_TAG              "at.sim76xx"
+#include <at_log.h>
+
+#ifdef AT_DEVICE_SIM76XX
+
+#define SIM76XX_MODULE_SEND_MAX_SIZE   2048
+#define SIM76XX_WAIT_CONNECT_TIME      5000
+#define SIM76XX_THREAD_STACK_SIZE      1024
+#define SIM76XX_THREAD_PRIORITY        (RT_THREAD_PRIORITY_MAX/2)
+
+/* set real event by current socket and current state */
+#define SET_EVENT(socket, event)       (((socket + 1) << 16) | (event))
+
+/* AT socket event type */
+#define SIM76XX_EVENT_CONN_OK          (1L << 0)
+#define SIM76XX_EVENT_SEND_OK          (1L << 1)
+#define SIM76XX_EVENT_RECV_OK          (1L << 2)
+#define SIM76XX_EVNET_CLOSE_OK         (1L << 3)
+#define SIM76XX_EVENT_CONN_FAIL        (1L << 4)
+#define SIM76XX_EVENT_SEND_FAIL        (1L << 5)
+
+uint8_t at_socket_init = 0;
+
+static int cur_socket;
+static int cur_send_bfsz;
+static rt_event_t at_socket_event;
+static rt_mutex_t at_event_lock;
+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)//Unsolicited TCP/IP command<err> codes
+{
+    switch(result)
+    {
+    case 0   : LOG_D("%d : operation succeeded ",           result); break;
+    case 1 : LOG_E("%d : UNetwork failure",                 result); break;
+    case 2 : LOG_E("%d : Network not opened",               result); break;
+    case 3 : LOG_E("%d : Wrong parameter",                  result); break;
+    case 4 : LOG_E("%d : Operation not supported",          result); break;
+    case 5 : LOG_E("%d : Failed to create socket",          result); break;
+    case 6 : LOG_E("%d : Failed to bind socket",            result); break;
+    case 7 : LOG_E("%d : TCP server is already listening",  result); break;
+    case 8 : LOG_E("%d : Busy",                             result); break;
+    case 9 : LOG_E("%d : Sockets opened",                   result); break;
+    case 10 : LOG_E("%d : Timeout ",                        result); break;
+    case 11 : LOG_E("%d : DNS parse failed for AT+CIPOPEN", result); break;
+    case 255 : LOG_E("%d : Unknown error",                  result); break;
+    }
+}
+
+
+static int at_socket_event_send(uint32_t event)
+{
+    return (int) rt_event_send(at_socket_event, event);
+}
+
+static int at_socket_event_recv(uint32_t event, uint32_t timeout, rt_uint8_t option)
+{
+    int result = 0;
+    rt_uint32_t recved;
+
+    result = rt_event_recv(at_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 sim76xx_socket_close(int socket)
+{
+    at_response_t resp = RT_NULL;
+    int result = RT_EOK;
+    int activated;
+    uint8_t lnk_stat[10];
+    
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(500));
+    if (!resp)
+    {
+        LOG_E("No memory for response structure!");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+    
+    rt_thread_delay(rt_tick_from_millisecond(100));
+    
+    // check socket link_state
+    if (at_exec_cmd(resp,"AT+CIPCLOSE?") < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    if(at_resp_parse_line_args_by_kw(resp,"+CIPCLOSE:", "+CIPCLOSE: %d,%d,%d,%d,%d,%d,%d,%d,%d,%d",&lnk_stat[0],&lnk_stat[1],&lnk_stat[1]
+        ,&lnk_stat[2],&lnk_stat[3],&lnk_stat[4],&lnk_stat[5],&lnk_stat[6],&lnk_stat[7],&lnk_stat[8],&lnk_stat[9]) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+       
+    if (lnk_stat[socket])
+    {
+        // close tcp or udp socket if connected
+        if (at_exec_cmd(resp, "AT+CIPCLOSE=%d", socket) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }            
+    }
+    // check the network open or not
+    if (at_exec_cmd(resp,"AT+NETOPEN?") < 0)
+    {
+        result = -RT_ERROR;
+        
+        goto __exit;
+    }
+    
+    if(at_resp_parse_line_args_by_kw(resp, "+NETOPEN:", "+NETOPEN: %d", &activated) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    if (activated)
+    {
+        // if already open,then close it.
+        if (at_exec_cmd(resp,"AT+NETCLOSE") < 0)
+        {
+            result = -RT_ERROR;
+            
+            goto __exit;
+        }
+    }
+ __exit:
+    rt_mutex_release(at_event_lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+/**
+ * open packet network
+ */
+static int sim76xx_network_socket_open(void)
+{
+    int result = RT_EOK;
+    at_response_t resp = RT_NULL;
+    int activated;
+ 
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(5000));
+    if (!resp)
+    {
+        LOG_E("No memory for response structure!");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+   
+    // check the network open or not
+    if (at_exec_cmd(resp,"AT+NETOPEN?") < 0)
+    {
+        result = -RT_ERROR;
+        
+        goto __exit;
+    }
+    
+    if(at_resp_parse_line_args_by_kw(resp, "+NETOPEN:", "+NETOPEN: %d", &activated) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    if (activated)
+    {//network socket is already opened
+        goto __exit;
+    }else
+    {
+        // if not opened the open it.
+        if (at_exec_cmd(resp,"AT+NETOPEN") < 0)
+        {
+            result = -RT_ERROR;
+            
+            goto __exit;
+        }
+    }    
+__exit:
+    rt_mutex_release(at_event_lock);
+
+    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 sim76xx_socket_connect(int socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
+{
+    at_response_t resp = RT_NULL;
+    int result = RT_EOK,event_result = 0;
+    rt_bool_t retryed = RT_FALSE;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(5000));
+    if (!resp)
+    {
+        LOG_E("No memory for response structure!");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+
+__retry:
+    if (is_client)
+    {
+        //open network socket first(AT+NETOPEN)
+        sim76xx_network_socket_open();
+        
+        switch (type)
+        {
+        case AT_SOCKET_TCP:        
+            /* send AT commands to connect TCP server */
+            if (at_exec_cmd(resp, "AT+CIPOPEN=%d,\"TCP\",\"%s\",%d", socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+            }
+            break;
+
+        case AT_SOCKET_UDP:
+            if (at_exec_cmd(resp, "AT+CIPOPEN=%d,\"UDP\",\"%s\",%d", socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+            }
+            break;
+
+        default:
+            LOG_E("Not supported connect type : %d.", 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 (at_socket_event_recv(SET_EVENT(socket, 0), rt_tick_from_millisecond(10 * 1000), RT_EVENT_FLAG_OR) < 0)
+    {
+        LOG_E("socket (%d) connect failed, wait connect result timeout.", socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* waiting OK or failed result */
+    if ((event_result = at_socket_event_recv(SIM76XX_EVENT_CONN_OK | SIM76XX_EVENT_CONN_FAIL, rt_tick_from_millisecond(1 * 1000),
+            RT_EVENT_FLAG_OR)) < 0)
+    {
+        LOG_E("socket (%d) connect failed, wait connect OK|FAIL timeout.", socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    /* check result */
+    if (event_result & SIM76XX_EVENT_CONN_FAIL)
+    {
+        if (!retryed)
+        {
+            LOG_E("socket (%d) connect failed, maybe the socket was not be closed at the last time and now will retry.", socket);
+            if (sim76xx_socket_close(socket) < 0)
+            {
+                goto __exit;
+            }
+            retryed = RT_TRUE;
+            goto __retry;
+        }
+        LOG_E("socket (%d) connect failed, failed to establish a connection.", socket);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (result != RT_EOK && !retryed)
+    {
+        LOG_D("socket (%d) connect failed, maybe the socket was not be closed at the last time and now will retry.", socket);
+        if (sim76xx_socket_close(socket) < 0)
+        {
+            goto __exit;
+        }
+        retryed = RT_TRUE;
+        result = RT_EOK;
+        goto __retry;
+    }
+
+__exit:
+    rt_mutex_release(at_event_lock);
+
+    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 sim76xx_socket_send(int socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    int result = RT_EOK;
+    int event_result = 0;
+    at_response_t resp = RT_NULL;
+    size_t cur_pkt_size = 0, sent_size = 0;
+
+    RT_ASSERT(buff);
+    RT_ASSERT(bfsz > 0);
+
+    resp = at_create_resp(128, 2, rt_tick_from_millisecond(5000));
+    if (!resp)
+    {
+        LOG_E("No memory for response structure!");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+
+    /* set current socket for send URC event */
+    cur_socket = socket;
+    /* set AT client end sign to deal with '>' sign.*/
+    at_set_end_sign('>');
+
+    while (sent_size < bfsz)
+    {
+        if (bfsz - sent_size < SIM76XX_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = SIM76XX_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+CIPSEND" commands to AT server than receive the '>' response on the first line. */
+        if (at_exec_cmd(resp, "AT+CIPSEND=%d,%d", socket, cur_pkt_size) < 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* send the real data to server or client */
+        result = (int) at_client_send(buff + sent_size, cur_pkt_size);
+        if (result == 0)
+        {
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        /* waiting result event from AT URC */
+        if (at_socket_event_recv(SET_EVENT(socket, 0), rt_tick_from_millisecond(5 * 1000), RT_EVENT_FLAG_OR) < 0)
+        {
+            LOG_E("socket (%d) send failed, wait connect result timeout.", socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* waiting OK or failed result */
+        if ((event_result = at_socket_event_recv(SIM76XX_EVENT_SEND_OK | SIM76XX_EVENT_SEND_FAIL, rt_tick_from_millisecond(5 * 1000),
+                RT_EVENT_FLAG_OR)) < 0)
+        {
+            LOG_E("socket (%d) send failed, wait connect OK|FAIL timeout.", socket);
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* check result */
+        if (event_result & SIM76XX_EVENT_SEND_FAIL)
+        {
+            LOG_E("socket (%d) send failed, return failed.", socket);
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+        if (type == AT_SOCKET_TCP)
+        {
+            cur_pkt_size = cur_send_bfsz;
+        }
+
+        sent_size += cur_pkt_size;
+    }
+
+__exit:
+    /* reset the end sign for data */
+    at_set_end_sign(0);
+
+    rt_mutex_release(at_event_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
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int sim76xx_domain_resolve(const char *name, char ip[16])
+{
+#define RESOLVE_RETRY        5
+
+    int i, result = RT_EOK;
+    char domain[32] = { 0 };
+    char domain_ip[16] = {0};
+    at_response_t resp = RT_NULL;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(5000));
+    if (!resp)
+    {
+        LOG_E("No memory for response structure!");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+
+    for(i = 0; i < RESOLVE_RETRY; i++)
+    {
+        if (at_exec_cmd(resp, "AT+CDNSGIP=\"%s\"", name) < 0)
+        {
+            rt_thread_delay(rt_tick_from_millisecond(200));
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+
+        /* parse the third line of response data, get the IP address */
+        /* +CDNSGIP: 1,"www.baidu.com","14.215.177.39" */
+        if(at_resp_parse_line_args_by_kw(resp, "+CDNSGIP:", "+CDNSGIP: 1,%[^,],\"%[^\"]", domain,domain_ip) < 0)
+        {
+            rt_thread_delay(rt_tick_from_millisecond(200));
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+
+        if (strlen(domain_ip) < 8)
+        {
+            rt_thread_delay(rt_tick_from_millisecond(200));
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+        else
+        {
+            strncpy(ip, domain_ip, 15);
+            ip[15] = '\0';
+            break;
+        }
+    }
+
+    rt_mutex_release(at_event_lock);
+
+    if (i == RESOLVE_RETRY)
+    {
+        result = -RT_ERROR;        
+    }
+    
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void sim76xx_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_send_func(const char *data, rt_size_t size)
+{
+    int socket = 0;
+    int rqst_size;
+    int cnf_size;
+    
+    RT_ASSERT(data && size);
+
+    sscanf(data,"+CIPSEND: %d,%d,%d",&socket,&rqst_size,&cnf_size);
+    
+    cur_send_bfsz = cnf_size;
+    
+    at_socket_event_send(SET_EVENT(socket, SIM76XX_EVENT_SEND_OK));
+}
+
+static void urc_ping_func(const char *data, rt_size_t size)
+{
+    static int icmp_seq = 0;
+    int i, j = 0;
+    int result, recv_len, time, ttl;
+    int sent, rcvd, lost, min, max, avg;
+    char dst_ip[16] = { 0 };
+
+    RT_ASSERT(data);
+
+    for (i=0;i<size;i++)
+    {
+        if(*(data+i) == '.')
+            j++;
+    }
+    if (j != 0)
+    {
+        sscanf(data, "+CPING: %d,%[^,],%d,%d,%d", &result, dst_ip, &recv_len, &time, &ttl);
+        if (result == 1)
+            LOG_I("%d bytes from %s icmp_seq=%d ttl=%d time=%d ms", recv_len, dst_ip, icmp_seq++, ttl, time);
+    }
+    else
+    {
+        sscanf(data, "+CPING: %d,%d,%d,%d,%d,%d,%d", &result, &sent, &rcvd, &lost, &min, &max, &avg);
+        if (result == 3)
+            LOG_I("%d sent %d received %d lost, min=%dms max=%dms average=%dms", sent, rcvd, lost, min, max, avg);
+        if (result == 2)
+            LOG_I("ping requst timeout");            
+    }
+}
+
+
+static void urc_connect_func(const char *data, rt_size_t size)
+{
+    int socket = 0;
+    int result = 0;
+
+    RT_ASSERT(data && size);
+
+    sscanf(data, "+CIPOPEN: %d,%d", &socket , &result);
+
+    if (result == 0)
+    {
+        at_socket_event_send(SET_EVENT(socket, SIM76XX_EVENT_CONN_OK));
+    }
+    else
+    {
+        at_tcp_ip_errcode_parse(result);
+        at_socket_event_send(SET_EVENT(socket, SIM76XX_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_close_func(const char *data, rt_size_t size)
+{
+    int socket = 0;
+    int reason = 0;
+
+    RT_ASSERT(data && size);
+
+    sscanf(data, "+IPCLOSE %d,%d", &socket, &reason);
+    
+    switch(reason)
+    {
+    case 0:
+        LOG_E("socket is closed by local,active");
+        break;
+    case 1:
+        LOG_E("socket is closed by remote,passive");
+        break;
+    case 2:
+        LOG_E("socket is closed for sending timeout");
+        break;
+    }
+    
+    /* 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(const char *data, rt_size_t size)
+{
+    rt_size_t bfsz = 0, temp_size = 0;
+    rt_int32_t timeout;
+    char *recv_buf = RT_NULL, temp[8];
+
+    RT_ASSERT(data && size);
+
+    /* get the current socket and receive buffer size by receive data */
+    sscanf(data, "+IPD%d:",(int *) &bfsz);
+    /* get receive timeout by receive buffer length */
+    timeout = bfsz * 2;
+
+    if (bfsz == 0)
+        return;
+
+    recv_buf = rt_calloc(1, bfsz);
+    if (!recv_buf)
+    {
+        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_recv(temp, sizeof(temp), timeout);
+            }
+            else
+            {
+                at_client_recv(temp, bfsz - temp_size, timeout);
+            }
+            temp_size += sizeof(temp);
+        }
+        return;
+    }
+
+    /* sync receive data */
+    if (at_client_recv(recv_buf, bfsz, timeout) != bfsz)
+    {
+        LOG_E("receive size(%d) data failed!", bfsz);
+        rt_free(recv_buf);
+        return;
+    }
+
+    /* notice the receive buffer and buffer size */
+    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
+    {
+        at_evt_cb_set[AT_SOCKET_EVT_RECV](cur_socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+static struct at_urc urc_table[] = {
+        {"+CIPSEND:",      "\r\n",           urc_send_func},
+        {"+CIPOPEN:",      "\r\n",           urc_connect_func},
+        {"+CPING:",        "\r\n",           urc_ping_func},
+        {"+IPCLOSE",       "\r\n",           urc_close_func},
+        {"+IPD",           "\r\n",           urc_recv_func},
+};
+
+#define AT_SEND_CMD(resp, cmd)                                                                          \
+    do                                                                                                  \
+    {                                                                                                   \
+        if (at_exec_cmd(at_resp_set_info(resp, 256, 0, rt_tick_from_millisecond(5000)), cmd) < 0)       \
+        {                                                                                               \
+            LOG_E("RT AT send commands(%s) error!", cmd);                                               \
+            result = -RT_ERROR;                                                                         \
+            goto __exit;                                                                                \
+        }                                                                                               \
+    } while(0);                                                                                         \
+
+static void sim76xx_init_thread_entry(void *parameter)
+{
+#define CSQ_RETRY                      20
+#define CREG_RETRY                     10
+#define CGREG_RETRY                    20
+#define CGATT_RETRY                    10
+#define CCLK_RETRY                     10
+    
+    at_response_t resp = RT_NULL;
+    rt_err_t result = RT_EOK;
+    rt_size_t i, qi_arg[3];
+    char parsed_data[20];
+
+    resp = at_create_resp(128, 0, rt_tick_from_millisecond(300));
+    if (!resp)
+    {
+        LOG_E("No memory for response structure!");
+        result = -RT_ENOMEM;
+        goto __exit;
+    }
+    
+    /* TODO: maybe you should power-up sim76xx first*/
+        
+    LOG_D("Start initializing the SIM76XXE module");
+    /* wait SIM76XX startup finish, Send AT every 5s, if receive OK, SYNC success*/
+    if (at_client_wait_connect(SIM76XX_WAIT_CONNECT_TIME))
+    {
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+    
+    /* disable echo */
+    AT_SEND_CMD(resp, "ATE0");
+    
+    /* get module version */
+    AT_SEND_CMD(resp, "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 */
+    
+    AT_SEND_CMD(resp, "AT+CPIN?");
+    if (!at_resp_get_line_by_kw(resp, "READY"))
+    {
+        LOG_E("SIM card detection failed");
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    /* waiting for dirty data to be digested */
+    rt_thread_delay(rt_tick_from_millisecond(10));
+    /* check signal strength */
+    for (i = 0; i < CSQ_RETRY; i++)
+    {
+        AT_SEND_CMD(resp, "AT+CSQ");
+        at_resp_parse_line_args_by_kw(resp, "+CSQ:", "+CSQ: %d,%d", &qi_arg[0], &qi_arg[1]);
+        if (qi_arg[0] != 99)
+        {
+            LOG_D("Signal strength: %d  Channel bit error rate: %d", qi_arg[0], qi_arg[1]);
+            break;
+        }
+        rt_thread_delay(rt_tick_from_millisecond(1000));
+    }
+        
+    if (i == CSQ_RETRY)
+    {
+        LOG_E("Signal strength check failed (%s)", parsed_data);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    //do not show the prompt when receiving data    
+    AT_SEND_CMD(resp, "AT+CIPSRIP=0");
+    
+    /* check the GSM network is registered */
+    for (i = 0; i < CREG_RETRY; i++)
+    {
+        AT_SEND_CMD(resp,"AT+CREG?");
+        at_resp_parse_line_args_by_kw(resp, "+CREG:", "+CREG: %s", &parsed_data);
+        if (!strncmp(parsed_data, "0,1", sizeof(parsed_data)) || !strncmp(parsed_data, "0,5", sizeof(parsed_data)))
+        {
+            LOG_D("GSM network is registered (%s)", parsed_data);
+            break;
+        }
+        rt_thread_delay(rt_tick_from_millisecond(1000));
+    }
+    if (i == CREG_RETRY)
+    {
+        LOG_E("The GSM network is register failed (%s)", parsed_data);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    /* check the GPRS network is registered */
+    for (i = 0; i < CGREG_RETRY; i++)
+    {
+        AT_SEND_CMD(resp,"AT+CGREG?");
+        at_resp_parse_line_args_by_kw(resp, "+CGREG:", "+CGREG: %s", &parsed_data);
+        if (!strncmp(parsed_data, "0,1", sizeof(parsed_data)) || !strncmp(parsed_data, "0,5", sizeof(parsed_data)))
+        {
+            LOG_D("GPRS network is registered (%s)", parsed_data);
+            break;
+        }
+        rt_thread_delay(rt_tick_from_millisecond(1000));
+    }
+    
+    if (i == CGREG_RETRY)
+    {
+        LOG_E("The GPRS network is register failed (%s)", parsed_data);
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    /* check packet domain attach or detach */
+    for (i = 0;i < CGATT_RETRY; i++)
+    {
+        AT_SEND_CMD(resp,"AT+CGATT?")
+        at_resp_parse_line_args_by_kw(resp,"+CGATT:","+CGATT: %s",&parsed_data);
+        if (!strncmp(parsed_data,"1",1))
+        {
+            LOG_I("Packet domain attach");
+            break;
+        }
+        
+        rt_thread_delay(rt_tick_from_millisecond(1000));
+    }
+    
+    if (i == CGATT_RETRY)
+    {
+        LOG_E("The GPRS network attach failed");
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    /* get real time */
+    int year,month,day,hour,min,sec;
+    
+    for (i = 0;i < CCLK_RETRY;i++)
+    {
+        if (at_exec_cmd(at_resp_set_info(resp, 256, 0, rt_tick_from_millisecond(5000)), "AT+CCLK?") < 0)
+        { 
+            rt_thread_delay(rt_tick_from_millisecond(500));
+            continue;
+        }
+        
+        //+CCLK: "18/12/22,18:33:12+32"
+        if (at_resp_parse_line_args_by_kw(resp,"+CCLK:","+CCLK: \"%d/%d/%d,%d:%d:%d",&year,&month,&day,&hour,&min,&sec) < 0)
+        {
+            rt_thread_delay(rt_tick_from_millisecond(500));
+            continue;
+        }
+        
+        set_date(year + 2000,month,day);
+        set_time(hour,min,sec);
+        
+        break;
+    }
+    
+    if (i == CCLK_RETRY)
+    {
+        LOG_E("The GPRS network attach failed");
+        result = -RT_ERROR;
+        goto __exit;
+    }
+    
+    /* set active PDP context's profile number */
+    AT_SEND_CMD(resp, "AT+CSOCKSETPN=1");
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    if (!result)
+    {
+        LOG_I("AT network initialize success!");
+        at_socket_init = 1;
+    }
+    else
+    {
+        LOG_E("AT network initialize failed (%d)!", result);
+    }
+}
+
+int sim76xx_net_init(void)
+{
+#ifdef PKG_AT_INIT_BY_THREAD
+    rt_thread_t tid;
+
+    tid = rt_thread_create("sim76xx_net_init", sim76xx_init_thread_entry, RT_NULL,SIM76XX_THREAD_STACK_SIZE, SIM76XX_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("Create AT initialization thread fail!");
+    }
+#else
+    sim76xx_init_thread_entry(RT_NULL);
+#endif
+
+    return RT_EOK;
+}
+
+int sim76xx_ping(int argc, char **argv)
+{
+    at_response_t resp = RT_NULL;
+
+    if (argc != 2)
+    {
+        rt_kprintf("Please input: at_ping <host address>\n");
+        return -RT_ERROR;
+    }
+
+    resp = at_create_resp(64, 0, rt_tick_from_millisecond(5000));
+    if (!resp)
+    {
+        rt_kprintf("No memory for response structure!\n");
+        return -RT_ENOMEM;
+    }
+
+    if (at_exec_cmd(resp, "AT+CPING=\"%s\",1,4,64,1000,10000,255", argv[1]) < 0)
+    {
+        if (resp)
+        {
+            at_delete_resp(resp);
+        }
+        rt_kprintf("AT send ping commands error!\n");
+        return -RT_ERROR;
+    }
+    
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return RT_EOK;
+}
+
+int sim76xx_connect(int argc, char **argv)
+{
+    int32_t port;
+
+    if (argc != 3)
+    {
+        rt_kprintf("Please input: at_connect <host address>\n");
+        return -RT_ERROR;
+    }
+    sscanf(argv[2],"%d",&port);
+    sim76xx_socket_connect(0, argv[1], port, AT_SOCKET_TCP, 1);
+
+    return RT_EOK;
+}
+
+int sim76xx_close(int argc, char **argv)
+{
+    if (sim76xx_socket_close(0) < 0)
+    {
+        rt_kprintf("sim76xx_socket_close fail\n");
+    }
+    else
+    {
+        rt_kprintf("sim76xx_socket_closeed\n");
+    }
+    return RT_EOK;
+}
+
+int sim76xx_send(int argc, char **argv)
+{
+    const char *buff = "1234567890\n";
+    if (sim76xx_socket_send(0, buff, 11, AT_SOCKET_TCP) < 0)
+    {
+        rt_kprintf("sim76xx_socket_send fail\n");
+    }
+
+    return RT_EOK;
+}
+
+int sim76xx_domain(int argc, char **argv)
+{
+    char ip[16];
+    if (sim76xx_domain_resolve("www.baidu.com", ip) < 0)
+    {
+        rt_kprintf("sim76xx_socket_send fail\n");
+    }
+    else
+    {
+        rt_kprintf("baidu.com : %s\n", ip);
+    }
+
+    return RT_EOK;
+}
+
+int sim76xx_ifconfig(void)
+{
+    at_response_t resp = RT_NULL;
+    char resp_arg[AT_CMD_MAX_LEN] = { 0 };
+    rt_err_t result = RT_EOK;
+
+    resp = at_create_resp(128, 2, rt_tick_from_millisecond(300));
+    if (!resp)
+    {
+        rt_kprintf("No memory for response structure!\n");
+        return -RT_ENOMEM;
+    }
+    
+    /* Show PDP address */
+    AT_SEND_CMD(resp, "AT+CGPADDR");
+    at_resp_parse_line_args_by_kw(resp, "+CGPADDR:", "+CGPADDR: %s", &resp_arg);
+    rt_kprintf("IP adress : %s\n", resp_arg);
+
+__exit:
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+
+#ifdef FINSH_USING_MSH
+#include <finsh.h>
+MSH_CMD_EXPORT_ALIAS(sim76xx_net_init, at_net_init, initialize AT network);
+MSH_CMD_EXPORT_ALIAS(sim76xx_ping, at_ping, AT ping network host);
+MSH_CMD_EXPORT_ALIAS(sim76xx_ifconfig, at_ifconfig, list the information of network interfaces);
+MSH_CMD_EXPORT_ALIAS(sim76xx_connect, at_connect, AT connect network host);
+MSH_CMD_EXPORT_ALIAS(sim76xx_close, at_close, AT close a socket);
+MSH_CMD_EXPORT_ALIAS(sim76xx_send, at_send, AT send a pack);
+MSH_CMD_EXPORT_ALIAS(sim76xx_domain, at_domain, AT domain resolve);
+#endif
+
+static const struct at_device_ops sim76xx_socket_ops = {
+    sim76xx_socket_connect,
+    sim76xx_socket_close,
+    sim76xx_socket_send,
+    sim76xx_domain_resolve,
+    sim76xx_socket_set_event_cb,
+};
+
+static int at_socket_device_init(void)
+{
+    /* create current AT socket event */
+    at_socket_event = rt_event_create("at_se", RT_IPC_FLAG_FIFO);
+    if (at_socket_event == RT_NULL)
+    {
+        LOG_E("RT AT client port initialize failed! at_sock_event create failed!");
+        return -RT_ENOMEM;
+    }
+
+    /* create current AT socket event lock */
+    at_event_lock = rt_mutex_create("at_se", RT_IPC_FLAG_FIFO);
+    if (at_event_lock == RT_NULL)
+    {
+        LOG_E("RT AT client port initialize failed! at_sock_lock create failed!");
+        rt_event_delete(at_socket_event);
+        return -RT_ENOMEM;
+    }
+
+    /* initialize AT client */
+    at_client_init(AT_DEVICE_NAME, AT_DEVICE_RECV_BUFF_LEN);
+
+    /* register URC data execution function  */
+    at_set_urc_table(urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
+
+    /* initialize sim76xx network */
+    sim76xx_net_init();
+
+    /* set sim76xx AT Socket options */
+    at_socket_device_register(&sim76xx_socket_ops);
+
+    return RT_EOK;
+}
+INIT_APP_EXPORT(at_socket_device_init);
+
+#endif /* AT_DEVICE_SIM76XX */