esp8266 AT指令 MQTT连接问题

发布于 2018-08-26 10:58:46 浏览：6907 订阅该版

* 本帖最后由 loock 于 2018-8-26 11:01 编辑 *

本人大学僧一枚，第一次用rtthread。
我用esp8266+MQTT连接服务器，出现了点问题，请大佬指点一下

已经做的工作：
1、配置AT-device，根据应用笔记配置，AT client能够正常运行，[https://www.rt-thread.org/docume ... d-system-at-client/](https://www.rt-thread.org/document/site/rtthread-application-note/components/at/an0014-rtthread-system-at-client/)
2、参考github文档（[https://github.com/RT-Thread-packages/at_device](https://github.com/RT-Thread-packages/at_device)）
文档内容如下：
```AT device 软件包是对 AT 组件库和 AT socket 功能的移植，需开启 AT 组件库和 AT socket 功能来获取 AT device 软件包。

先要开启 AT 组件库和 AT socket 功能， 具体路径如下所示：

RT-Thread Components --->
 Network stack --->
 Socket abstraction layer --->
 protocol family type --->
 [ ] Support lwIP stack
 (*) Support AT Commands stack
开启 AT socket 功能之后，默认开启 AT device 软件包， 具体路径如下所示：

RT-Thread online packages --->
 IoT - internet of things --->
 -*- AT DEVICE: RT-Thread AT component porting or samples for different device 
 AT socket device modules (Not selected, please select) ---> 
 Version (latest) --->
AT socket device modules: AT 设备选择，目前支持 ESP8266、M26/MC20 等设备；
Version: 下载软件包版本；```
参考文档没有找到【 Support AT Commands stack】配置选项，不知道是不是这个问题。
在第二部分中已经选择ESP8266.

2、配置mqtt，并选择例程
```        --- Paho MQTT: Eclipse Paho MQTT C/C++ client for Embedded platforms  
  │ │                       MQTT mode (Pipe mode: high performance and depends on DFS)  ---> 
  │ │                 [ ]   Enable MQTT example                            
  │ │                 (*)   Enable MQTT test                            
  │ │                 [ ]   Enable support tls protocol             
  │ │                 (4096) Set MQTT thread stack size           
  │ │                 (1)   Max pahomqtt subscribe topic handlers           
  │ │                 [ ]   Enable debug log output                 
  │ │                       version (latest)  --->```

3、在main中启动AT_Client
```#include <rtthread.h>
#include <at.h>
int main(void)
{
 /* user app entry */
 at_client_init();
 
 return 0;
}
```

4、目前AT-client能够正常运行，并能通过TCP连接到服务器端口
```msh />at client
======== Welcome to using RT-Thread AT command client cli ========
Cli will forward your command to server port(uart2). Press 'ESC' to exit.
AT+CIPSTART="TCP","115.159.62.111",1883
AT+CIPSTART="TCP","115.159.62.111",1883
CONNECT

OK
```

5、mqtt例程不能正常运行
```msh />mqtt_test start
[D/MQTT] ipv4 address port: 1883
[D/MQTT] HOST = '115.159.62.111'
[E/MQTT] getaddrinfo err: -1 '115.159.62.111'
[E/MQTT] resolve uri err
[E/MQTT] Net connect error(-1)
Waiting mqtt is connected!
[D/MQTT] restart!
[D/MQTT] ipv4 address port: 1883
[D/MQTT] HOST = '115.159.62.111'
[E/MQTT] getaddrinfo err: -1 '115.159.62.111'
[E/MQTT] resolve uri err
[E/MQTT] Net connect error(-1)
Waiting mqtt is connected!
```例程mqtt_test.c中我只是改改了clientid和passward，还有ip```#define MQTT_TEST_SERVER_URI "tcp://115.159.62.111:1883"
#define MQTT_CLIENTID 。。。
#define MQTT_USERNAME 。。。
#define MQTT_PASSWORD 。。。
#define MQTT_SUBTOPIC "/mqtt/test"
#define MQTT_PUBTOPIC "/mqtt/test"
#define MQTT_WILLMSG "Goodbye!"
#define MQTT_TEST_QOS 1
#define MQTT_PUB_SUB_BUF_SIZE 1024

#define CMD_INFO "'mqtt_test <start|stop>'"
#define TEST_DATA_SIZE 256
#define PUB_CYCLE_TM 1000

static rt_thread_t pub_thread_tid = RT_NULL;

static char *pub_data = RT_NULL;
```mqtt错误显示获取add是出错，个人认为是mqtt软件包个AT通信的问题，请大佬指点一下。