Merge pull request #35 from loogg/mlw-fs

添加SIM800C支持

README.md

@@ -10,6 +10,7 @@ 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_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 |

SConscript

@@ -2,6 +2,8 @@ from building import *
 
 cwd = GetCurrentDir()
 
+src = []
+
 if GetDepend(['AT_DEVICE_M26']):
     src = Glob('at_socket_m26.c')
 
@@ -14,6 +16,9 @@ if GetDepend(['AT_DEVICE_ESP8266']):
 if GetDepend(['AT_DEVICE_RW007']):
     src = Glob('at_socket_rw007.c')
 
+if GetDepend(['AT_DEVICE_SIM800C']):
+    src += Glob('at_socket_sim800c.c')
+
 if GetDepend(['AT_DEVICE_NOT_SELECTED']):
    src = Glob('*.c')
 

at_socket_sim800c.c

@@ -0,0 +1,888 @@
+/*
+ * File      : at_socket_sim800c.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
+ */
+#include <stdio.h>
+#include <string.h>
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <sys/socket.h>
+
+#include <at.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.sim800c"
+#include <at_log.h>
+
+#ifdef AT_DEVICE_SIM800C
+
+
+#define SIM800C_MODULE_SEND_MAX_SIZE       1000
+#define SIM800C_WAIT_CONNECT_TIME          5000
+#define SIM800C_THREAD_STACK_SIZE          1024
+#define SIM800C_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 SIM800C_EVENT_CONN_OK              (1L << 0)
+#define SIM800C_EVENT_SEND_OK              (1L << 1)
+#define SIM800C_EVENT_RECV_OK              (1L << 2)
+#define SIM800C_EVNET_CLOSE_OK             (1L << 3)
+#define SIM800C_EVENT_CONN_FAIL            (1L << 4)
+#define SIM800C_EVENT_SEND_FAIL            (1L << 5)
+
+/* AT+CSTT command default*/
+char *CSTT_CHINA_MOBILE  = "AT+CSTT=\"CMNET\"";
+char *CSTT_CHINA_UNICOM  = "AT+CSTT=\"UNINET\"";
+char *CSTT_CHINA_TELECOM = "AT+CSTT=\"CTNET\"";
+
+
+static int cur_socket;
+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 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 sim800c_socket_close(int socket)
+{
+    int result = 0;
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+    cur_socket = socket;
+
+    if (at_exec_cmd(RT_NULL, "AT+CIPCLOSE=%d", socket) < 0)
+    {
+        result = -RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_socket_event_recv(SET_EVENT(socket, SIM800C_EVNET_CLOSE_OK), rt_tick_from_millisecond(300*3), RT_EVENT_FLAG_AND) < 0)
+    {
+        LOG_E("socket (%d) close failed, wait close OK timeout.", socket);
+        result = -RT_ETIMEOUT;
+        goto __exit;
+    }
+
+__exit:
+    rt_mutex_release(at_event_lock);
+
+    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 sim800c_socket_connect(int socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
+{
+    int result = 0, event_result = 0;
+    rt_bool_t retryed = RT_FALSE;
+
+    RT_ASSERT(ip);
+    RT_ASSERT(port >= 0);
+
+    /* lock AT socket connect */
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+
+__retry:
+
+    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_exec_cmd(RT_NULL, "AT+CIPSTART=%d,\"TCP\",\"%s\",%d", socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        case AT_SOCKET_UDP:
+            if (at_exec_cmd(RT_NULL, "AT+CIPSTART=%d,\"UDP\",\"%s\",%d", socket, ip, port) < 0)
+            {
+                result = -RT_ERROR;
+                goto __exit;
+            }
+            break;
+
+        default:
+            LOG_E("Not supported connect type : %d.", type);
+            result = -RT_ERROR;
+            goto __exit;
+            break;
+        }
+    }
+
+    /* 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(SIM800C_EVENT_CONN_OK | SIM800C_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 & SIM800C_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 (sim800c_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;
+    }
+
+__exit:
+    /* unlock AT socket connect */
+    rt_mutex_release(at_event_lock);
+
+    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 sim800c_socket_send(int socket, const char *buff, size_t bfsz, enum at_socket_type type)
+{
+    int result = 0, event_result = 0;
+    at_response_t resp = RT_NULL;
+    size_t cur_pkt_size = 0, sent_size = 0;
+
+    RT_ASSERT(buff);
+
+    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 < SIM800C_MODULE_SEND_MAX_SIZE)
+        {
+            cur_pkt_size = bfsz - sent_size;
+        }
+        else
+        {
+            cur_pkt_size = SIM800C_MODULE_SEND_MAX_SIZE;
+        }
+
+        /* send the "AT+QISEND" 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(SIM800C_EVENT_SEND_OK | SIM800C_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 & SIM800C_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 conflict */
+    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
+ *         -1: send AT commands error or response error
+ *         -2: wait socket event timeout
+ *         -5: no memory
+ */
+static int sim800c_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;
+
+    RT_ASSERT(name);
+    RT_ASSERT(ip);
+
+    /* The maximum response time is 14 seconds, affected by network status */
+    resp = at_create_resp(128, 4, rt_tick_from_millisecond(14 * 1000));
+    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)
+        {
+            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_delay(rt_tick_from_millisecond(100));
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+
+        if (strlen(recv_ip) < 8)
+        {
+            rt_thread_delay(rt_tick_from_millisecond(100));
+            /* resolve failed, maybe receive an URC CRLF */
+            continue;
+        }
+        else
+        {
+            strncpy(ip, recv_ip, 15);
+            ip[15] = '\0';
+            //LOG_I("DNS IP:%s",ip);
+            break;
+        }
+    }
+
+__exit:
+    rt_mutex_release(at_event_lock);
+
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+
+}
+
+/**
+ * set AT socket event notice callback
+ *
+ * @param event notice event
+ * @param cb notice callback
+ */
+static void sim800c_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(const char *data, rt_size_t size)
+{
+    int socket = 0;
+
+    RT_ASSERT(data && size);
+
+    sscanf(data, "%d,%*", &socket);
+
+    if (strstr(data, "CONNECT OK"))
+    {
+        at_socket_event_send(SET_EVENT(socket, SIM800C_EVENT_CONN_OK));
+    }
+    else if (strstr(data, "CONNECT FAIL"))
+    {
+        at_socket_event_send(SET_EVENT(socket, SIM800C_EVENT_CONN_FAIL));
+    }
+}
+
+static void urc_send_func(const char *data, rt_size_t size)
+{
+    RT_ASSERT(data && size);
+
+    if (strstr(data, "SEND OK"))
+    {
+        at_socket_event_send(SET_EVENT(cur_socket, SIM800C_EVENT_SEND_OK));
+    }
+    else if (strstr(data, "SEND FAIL"))
+    {
+        at_socket_event_send(SET_EVENT(cur_socket, SIM800C_EVENT_SEND_FAIL));
+    }
+}
+
+static void urc_close_func(const char *data, rt_size_t size)
+{
+    int socket = 0;
+
+    RT_ASSERT(data && size);
+
+    if (strstr(data, "CLOSE OK"))
+    {
+        at_socket_event_send(SET_EVENT(cur_socket, SIM800C_EVNET_CLOSE_OK));
+    }
+    else if (strstr(data, "CLOSED"))
+    {
+        sscanf(data, "%d, CLOSED", &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(const char *data, rt_size_t size)
+{
+    int socket = 0;
+    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, "+RECEIVE,%d,%d:", &socket, (int *) &bfsz);
+    /* get receive timeout by receive buffer length */
+    timeout = bfsz;
+
+    if (socket < 0 || 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](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
+    }
+}
+
+
+static void urc_func(const char *data, rt_size_t size)
+{
+    RT_ASSERT(data);
+
+    LOG_I("URC data : %.*s", size, data);
+}
+
+static const struct at_urc urc_table[] = {
+        {"RDY",         "\r\n",                 urc_func},
+        {"",            ", 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},
+};
+
+#define AT_SEND_CMD(resp, resp_line, timeout, cmd)                                                              \
+    do                                                                                                          \
+    {                                                                                                           \
+        if (at_exec_cmd(at_resp_set_info(resp, 128, resp_line, rt_tick_from_millisecond(timeout)), cmd) < 0)    \
+        {                                                                                                       \
+            result = -RT_ERROR;                                                                                 \
+            goto __exit;                                                                                        \
+        }                                                                                                       \
+    } while(0);                                                                                                 \
+
+static void sim800c_power_on(void)
+{
+    if (rt_pin_read(AT_DEVICE_STATUS_PIN) == PIN_HIGH)
+        return;
+    rt_pin_write(AT_DEVICE_POWER_PIN, PIN_HIGH);
+    while (rt_pin_read(AT_DEVICE_STATUS_PIN) == PIN_LOW)
+    {
+        rt_thread_delay(rt_tick_from_millisecond(10));
+    }
+    rt_pin_write(AT_DEVICE_POWER_PIN, PIN_LOW);
+}
+
+static void sim800c_power_off(void)
+{
+    if (rt_pin_read(AT_DEVICE_STATUS_PIN) == PIN_LOW)
+        return;
+    rt_pin_write(AT_DEVICE_POWER_PIN, PIN_HIGH);
+    while (rt_pin_read(AT_DEVICE_STATUS_PIN) == PIN_HIGH)
+    {
+        rt_thread_delay(rt_tick_from_millisecond(10));
+    }
+    rt_pin_write(AT_DEVICE_POWER_PIN, PIN_LOW);
+}
+
+/* init for SIM800C */
+static void sim800c_init_thread_entry(void *parameter)
+{
+#define CPIN_RETRY                     10
+#define CSQ_RETRY                      10
+#define CREG_RETRY                     10
+#define CGREG_RETRY                    20
+
+    at_response_t resp = RT_NULL;
+    int i, qimux;
+    char parsed_data[10];
+    rt_err_t result = RT_EOK;
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+
+    while (1)
+    {
+        result = RT_EOK;
+        rt_memset(parsed_data, 0, sizeof(parsed_data));
+        rt_thread_delay(rt_tick_from_millisecond(500));
+        sim800c_power_on();
+        rt_thread_delay(rt_tick_from_millisecond(2000));
+        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;
+        }
+        LOG_D("Start initializing the SIM800C module");
+        /* wait SIM800C startup finish */
+        if (at_client_wait_connect(SIM800C_WAIT_CONNECT_TIME))
+        {
+            result = -RT_ETIMEOUT;
+            goto __exit;
+        }
+        /* disable echo */
+        AT_SEND_CMD(resp, 0, 300, "ATE0");
+        /* get module version */
+        AT_SEND_CMD(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_exec_cmd(at_resp_set_info(resp, 128, 2, rt_tick_from_millisecond(5000)), "AT+CPIN?");
+
+            if (at_resp_get_line_by_kw(resp, "READY"))
+            {
+                LOG_D("SIM card detection success");
+                break;
+            }
+            rt_thread_delay(rt_tick_from_millisecond(1000));
+        }
+        if (i == CPIN_RETRY)
+        {
+            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 the GSM network is registered */
+        for (i = 0; i < CREG_RETRY; i++)
+        {
+            AT_SEND_CMD(resp, 0, 300, "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, 0, 300, "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 signal strength */
+        for (i = 0; i < CSQ_RETRY; i++)
+        {
+            AT_SEND_CMD(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("Signal strength: %s", parsed_data);
+                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;
+        }
+
+        /* the device default response timeout is 40 seconds, but it set to 15 seconds is convenient to use. */
+        AT_SEND_CMD(resp, 2, 20 * 1000, "AT+CIPSHUT");
+
+        /* Set to multiple connections */
+        AT_SEND_CMD(resp, 0, 300, "AT+CIPMUX?");
+        at_resp_parse_line_args_by_kw(resp, "+CIPMUX:", "+CIPMUX: %d", &qimux);
+        if (qimux == 0)
+        {
+            AT_SEND_CMD(resp, 0, 300, "AT+CIPMUX=1");
+        }
+
+        AT_SEND_CMD(resp, 0, 300, "AT+COPS?");
+        at_resp_parse_line_args_by_kw(resp, "+COPS:", "+COPS: %*[^\"]\"%[^\"]", &parsed_data);
+        if (strcmp(parsed_data, "CHINA MOBILE") == 0)
+        {
+            /* "CMCC" */
+            LOG_I("%s", parsed_data);
+            AT_SEND_CMD(resp, 0, 300, CSTT_CHINA_MOBILE);
+        }
+        else if (strcmp(parsed_data, "CHN-UNICOM") == 0)
+        {
+            /* "UNICOM" */
+            LOG_I("%s", parsed_data);
+            AT_SEND_CMD(resp, 0, 300, CSTT_CHINA_UNICOM);
+        }
+        else if (strcmp(parsed_data, "CHN-CT") == 0)
+        {
+            AT_SEND_CMD(resp, 0, 300, CSTT_CHINA_TELECOM);
+            /* "CT" */
+            LOG_I("%s", parsed_data);
+        }
+
+        /* the device default response timeout is 150 seconds, but it set to 20 seconds is convenient to use. */
+        AT_SEND_CMD(resp, 0, 20 * 1000, "AT+CIICR");
+
+        AT_SEND_CMD(resp, 2, 300, "AT+CIFSR");
+        if(at_resp_get_line_by_kw(resp, "ERROR") != RT_NULL)
+        {
+            LOG_E("Get the local address failed");
+            result = -RT_ERROR;
+            goto __exit;
+        }
+
+    __exit:
+        if (resp)
+        {
+            at_delete_resp(resp);
+        }
+
+        if (!result)
+        {
+            LOG_I("AT network initialize success!");
+            rt_mutex_release(at_event_lock);
+            break;
+        }
+        else
+        {
+            LOG_E("AT network initialize failed (%d)!", result);
+            sim800c_power_off();
+        }
+    }
+}
+
+int sim800c_net_init(void)
+{
+#ifdef PKG_AT_INIT_BY_THREAD
+    rt_thread_t tid;
+
+    tid = rt_thread_create("sim800c_net_init", sim800c_init_thread_entry, RT_NULL, SIM800C_THREAD_STACK_SIZE, SIM800C_THREAD_PRIORITY, 20);
+    if (tid)
+    {
+        rt_thread_startup(tid);
+    }
+    else
+    {
+        LOG_E("Create AT initialization thread fail!");
+    }
+#else
+    sim800c_init_thread_entry(RT_NULL);
+#endif
+
+    return RT_EOK;
+}
+
+int sim800c_ping(int argc, char **argv)
+{
+    LOG_E("This device does not support Ping!");
+    return RT_EOK;
+}
+
+int sim800c_ifconfig(void)
+{
+    at_response_t resp = RT_NULL;
+    char resp_arg[AT_CMD_MAX_LEN] = { 0 };
+    const char * resp_expr = "%s";
+    rt_err_t result = RT_EOK;
+
+    resp = at_create_resp(64, 2, rt_tick_from_millisecond(300));
+    if (!resp)
+    {
+        rt_kprintf("No memory for response structure!\n");
+        return -RT_ENOMEM;
+    }
+
+    rt_mutex_take(at_event_lock, RT_WAITING_FOREVER);
+    if (at_exec_cmd(resp, "AT+CIFSR") < 0)
+    {
+        rt_kprintf("AT send ip commands error!\n");
+        result = RT_ERROR;
+        goto __exit;
+    }
+
+    if (at_resp_parse_line_args(resp, 2, resp_expr, resp_arg) == 1)
+    {
+        rt_kprintf("IP address : %s\n", resp_arg);
+    }
+    else
+    {
+        rt_kprintf("Parse error, current line buff : %s\n", at_resp_get_line(resp, 2));
+        result = RT_ERROR;
+        goto __exit;
+    }
+
+__exit:
+    rt_mutex_release(at_event_lock);
+    
+    if (resp)
+    {
+        at_delete_resp(resp);
+    }
+
+    return result;
+}
+
+#ifdef FINSH_USING_MSH
+#include <finsh.h>
+MSH_CMD_EXPORT_ALIAS(sim800c_net_init, at_net_init, initialize AT network);
+MSH_CMD_EXPORT_ALIAS(sim800c_ping, at_ping, AT ping network host);
+MSH_CMD_EXPORT_ALIAS(sim800c_ifconfig, at_ifconfig, list the information of network interfaces);
+#endif
+
+static const struct at_device_ops sim800c_socket_ops = {
+    sim800c_socket_connect,
+    sim800c_socket_close,
+    sim800c_socket_send,
+    sim800c_domain_resolve,
+    sim800c_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("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("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 sim800c network */
+    rt_pin_mode(AT_DEVICE_POWER_PIN, PIN_MODE_OUTPUT);
+    rt_pin_mode(AT_DEVICE_STATUS_PIN, PIN_MODE_INPUT);
+    sim800c_net_init();
+
+    /* set sim800c AT Socket options */
+    at_socket_device_register(&sim800c_socket_ops);
+
+    return RT_EOK;
+}
+INIT_APP_EXPORT(at_socket_device_init);
+
+#endif /* AT_DEVICE_SIM800C */