/*
 * 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 */