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at_device/at_socket_esp8266.c

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/*
* File : at_socket_esp8266.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
*/
#include <stdio.h>
#include <string.h>
#include <rtthread.h>
#include <sys/socket.h>
#include <rt_at.h>
#include <at_socket.h>
#ifndef AT_DEVICE_NOT_SELECTED
#define ESP8266_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 ESP8266_EVENT_CONN_OK (1L << 0)
#define ESP8266_EVENT_SEND_OK (1L << 1)
#define ESP8266_EVENT_RECV_OK (1L << 2)
#define ESP8266_EVNET_CLOSE_OK (1L << 3)
#define ESP8266_EVENT_CONN_FAIL (1L << 4)
#define ESP8266_EVENT_SEND_FAIL (1L << 5)
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 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 esp8266_socket_close(int socket)
{
rt_at_response_t resp = RT_NULL;
int result = RT_EOK;
resp = rt_at_create_resp(64, 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);
if (rt_at_exec_cmd(resp, "AT+CIPCLOSE=%d", socket) < 0)
{
LOG_E("socket(%d) close failed.", socket);
result = -RT_ERROR;
goto __exit;
}
__exit:
rt_mutex_release(at_event_lock);
if (resp)
{
rt_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 esp8266_socket_connect(int socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
{
rt_at_response_t resp = RT_NULL;
int result = RT_EOK;
rt_bool_t retryed = RT_FALSE;
RT_ASSERT(ip);
RT_ASSERT(port >= 0);
resp = rt_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)
{
switch (type)
{
case AT_SOCKET_TCP:
/* send AT commands to connect TCP server */
if (rt_at_exec_cmd(resp, "AT+CIPSTART=%d,\"TCP\",\"%s\",%d,60", socket, ip, port) < 0)
{
result = -RT_ERROR;
}
break;
case AT_SOCKET_UDP:
if (rt_at_exec_cmd(resp, "AT+CIPSTART=%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;
}
}
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 (esp8266_socket_close(socket) < 0)
{
goto __exit;
}
retryed = RT_TRUE;
result = RT_EOK;
goto __retry;
}
__exit:
rt_mutex_release(at_event_lock);
if (result != RT_EOK)
{
LOG_E("socket (%d) connect failed, failed to establish a connection.", socket);
}
if (resp)
{
rt_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 esp8266_socket_send(int socket, const char *buff, size_t bfsz, enum at_socket_type type)
{
int result = RT_EOK;
int event_result = 0;
rt_at_response_t resp = RT_NULL;
size_t cur_pkt_size = 0, sent_size = 0;
RT_ASSERT(buff);
RT_ASSERT(bfsz > 0);
resp = rt_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.*/
extern int rt_at_set_end_sign(char ch);
rt_at_set_end_sign('>');
while (sent_size < bfsz)
{
if (bfsz - sent_size < ESP8266_MODULE_SEND_MAX_SIZE)
{
cur_pkt_size = bfsz - sent_size;
}
else
{
cur_pkt_size = ESP8266_MODULE_SEND_MAX_SIZE;
}
/* send the "AT+CIPSEND" commands to AT server than receive the '>' response on the first line. */
if (rt_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) rt_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(1 * 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(ESP8266_EVENT_SEND_OK | ESP8266_EVENT_SEND_FAIL, rt_tick_from_millisecond(1 * 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 & ESP8266_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 */
rt_at_set_end_sign(0);
rt_mutex_release(at_event_lock);
if (resp)
{
rt_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 esp8266_domain_resolve(const char *name, char ip[16])
{
int result = RT_EOK;
char recv_ip[16] = { 0 };
rt_at_response_t resp = RT_NULL;
RT_ASSERT(name);
RT_ASSERT(ip);
resp = rt_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);
__restart:
if (rt_at_exec_cmd(resp, "AT+CIPDOMAIN=\"%s\"", name) < 0)
{
result = -RT_ERROR;
goto __exit;
}
/* parse the third line of response data, get the IP address */
at_resp_parse_line_args(resp, 1, "+CIPDOMAIN:%s", recv_ip);
if (strlen(recv_ip) < 8)
{
rt_thread_delay(rt_tick_from_millisecond(100));
/* resolve failed, maybe receive an URC CRLF */
goto __restart;
}
strncpy(ip, recv_ip, 15);
ip[15] = '\0';
__exit:
rt_mutex_release(at_event_lock);
if (resp)
{
rt_at_delete_resp(resp);
}
return result;
}
/**
* set AT socket event notice callback
*
* @param event notice event
* @param cb notice callback
*/
static void esp8266_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)
{
RT_ASSERT(data && size);
if (strstr(data, "SEND OK"))
{
at_socket_event_send(SET_EVENT(cur_socket, ESP8266_EVENT_SEND_OK));
}
else if (strstr(data, "SEND FAIL"))
{
at_socket_event_send(SET_EVENT(cur_socket, ESP8266_EVENT_SEND_FAIL));
}
}
static void urc_send_bfsz_func(const char *data, rt_size_t size)
{
int send_bfsz = 0;
RT_ASSERT(data && size);
sscanf(data, "Recv %d bytes", &send_bfsz);
cur_send_bfsz = send_bfsz;
}
static void urc_close_func(const char *data, rt_size_t size)
{
int socket = 0;
RT_ASSERT(data && size);
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, RT_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;
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,%d:", &socket, (int *) &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))
{
rt_at_client_recv(temp, sizeof(temp));
}
else
{
rt_at_client_recv(temp, bfsz - temp_size);
}
temp_size += sizeof(temp);
}
return;
}
/* sync receive data */
if (rt_at_client_recv(recv_buf, bfsz) != 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_busy_p_func(const char *data, rt_size_t size)
{
RT_ASSERT(data && size);
LOG_D("system is processing a commands and it cannot respond to the current commands.");
}
static void urc_busy_s_func(const char *data, rt_size_t size)
{
RT_ASSERT(data && size);
LOG_D("system is sending data and it cannot respond to the current commands.");
}
static void urc_func(const char *data, rt_size_t size)
{
RT_ASSERT(data && size);
if(strstr(data, "WIFI CONNECTED"))
{
LOG_I("ESP8266 WIFI is connected.");
}
else if(strstr(data, "WIFI DISCONNECT"))
{
LOG_I("ESP8266 WIFI is disconnect.");
}
}
static struct rt_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},
{"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},
};
/* AT client port initialization */
int rt_at_client_port_init(void)
{
/* create current AT socket event */
at_socket_event = rt_event_create("at_sock_event", RT_IPC_FLAG_FIFO);
if (!at_socket_event)
{
LOG_E("RT AT client port initialize failed! at_sock_event create failed!");
return -RT_ENOMEM;
}
/* create current AT socket lock */
at_event_lock = rt_mutex_create("at_event_lock", RT_IPC_FLAG_FIFO);
if (!at_event_lock)
{
LOG_E("RT AT client port initialize failed! at_sock_lock create failed!");
rt_event_delete(at_socket_event);
return -RT_ENOMEM;
}
/* register URC data execution function */
rt_at_set_urc_table(urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
return RT_EOK;
}
#define AT_SEND_CMD(resp, cmd) \
do \
{ \
if (rt_at_exec_cmd(rt_at_resp_set_info(resp, 256, 0, rt_tick_from_millisecond(5000)), cmd) < 0) \
{ \
LOG_E("RT AT send commands(%s) error!", cmd); \
return -1; \
} \
} while(0); \
static int esp8266_net_init(void)
{
rt_at_response_t resp = RT_NULL;
rt_size_t i;
resp = rt_at_create_resp(128, 0, rt_tick_from_millisecond(5000));
if (!resp)
{
LOG_E("No memory for response structure!");
return -RT_ENOMEM;
}
/* reset module */
AT_SEND_CMD(resp, "AT+RST");
/* reset waiting delay */
rt_thread_delay(rt_tick_from_millisecond(1000));
/* disable echo */
AT_SEND_CMD(resp, "ATE0");
/* set current mode to Wi-Fi station */
AT_SEND_CMD(resp, "AT+CWMODE=1");
/* get module version */
AT_SEND_CMD(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))
}
/* connect to WiFi AP */
if (rt_at_exec_cmd(rt_at_resp_set_info(resp, 128, 0, 20 * RT_TICK_PER_SECOND), "AT+CWJAP=\"%s\",\"%s\"",
AT_DEVICE_WIFI_SSID, AT_DEVICE_WIFI_PASSWORD) != RT_EOK)
{
LOG_E("AT network initialize failed, check ssid(%s) and password(%s).", AT_DEVICE_WIFI_SSID, AT_DEVICE_WIFI_PASSWORD);
return -RT_ERROR;
}
AT_SEND_CMD(resp, "AT+CIPMUX=1");
if (resp)
{
rt_at_delete_resp(resp);
}
LOG_I("AT network initialize success!");
return RT_EOK;
}
int esp8266_ping(int argc, char **argv)
{
rt_at_response_t resp = RT_NULL;
static int icmp_seq;
int req_time;
if (argc != 2)
{
rt_kprintf("Please input: at_ping <host address>\n");
return -RT_ERROR;
}
resp = rt_at_create_resp(64, 0, rt_tick_from_millisecond(5000));
if (!resp)
{
rt_kprintf("No memory for response structure!\n");
return -RT_ENOMEM;
}
for(icmp_seq = 1; icmp_seq <= 4; icmp_seq++)
{
if (rt_at_exec_cmd(resp, "AT+PING=\"%s\"", argv[1]) < 0)
{
rt_kprintf("ping: unknown remote server host\n");
rt_at_delete_resp(resp);
return -RT_ERROR;
}
at_resp_parse_line_args(resp, 1, "+%d", &req_time);
if (req_time)
{
rt_kprintf("32 bytes from %s icmp_seq=%d time=%d ms\n", argv[1], icmp_seq, req_time);
}
}
if (resp)
{
rt_at_delete_resp(resp);
}
return RT_EOK;
}
#ifdef FINSH_USING_MSH
#include <finsh.h>
MSH_CMD_EXPORT_ALIAS(esp8266_net_init, at_net_init, initialize AT network);
MSH_CMD_EXPORT_ALIAS(esp8266_ping, at_ping, AT ping network host);
#endif
static const struct at_device_ops esp8266_socket_ops = {
.connect = esp8266_socket_connect,
.close = esp8266_socket_close,
.send = esp8266_socket_send,
.domain_resolve = esp8266_domain_resolve,
.set_event_cb = esp8266_socket_set_event_cb,
};
static int at_socket_device_init(void)
{
esp8266_net_init();
at_scoket_device_register(&esp8266_socket_ops);
return 0;
}
INIT_APP_EXPORT(at_socket_device_init);
#endif /* AT_DEVICE_NOT_SELECTED */
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