基于mini2440嵌入式linux上整合一套Domoticz智能家居系统（十一）使用domoticz+mosquitto+Android客户端实现控制STM32板上的LED（二）

本文在前一篇实现了STM32平台利用MQTT协议对接domoticz平台控制LED灯的基础上，完善了网络连接和MQTT的broker连接过程，实现了断网重连功能。

实现部分主要在rt-thread\components\external\paho-mqtt\MQTTClient-C\samples\domoticz\DomoticzThread.c中。
在前一篇的源码基础上稍作改动，如下所示：

DomoticzThread.c：

#include <rtthread.h>
#include "MQTTClient.h"
//#include "led.h"
#include "DomoticzMessageParser.h"


//#define __DEBUG

#ifdef __DEBUG
#include <stdarg.h>
#include <string.h>
static const char *getCurrentFileName()
{
    const char *p = strrchr(__FILE__,'\\');
    return ++p;
}
#define dprintf(fmt,...) rt_kprintf("%s,line:%d,"fmt,getCurrentFileName(),__LINE__,##__VA_ARGS__)
#else
#define dprintf(fmt,...)
#endif

struct opts_struct
{
    char* clientid;
    int nodelimiter;
    char* delimiter;
    enum QoS qos;
    char* username;
    char* password;
    char* host;
    int port;
    int showtopics;
} opts =
{
    (char*)"subscriber on STM32", 0, (char*)"\n", QOS2, NULL, NULL, (char*)"192.168.1.230", 1883, 0
};

int is_over;

void quit_domoticz_thread(void)
{
    is_over = 1;
}

//================== Added 2017-Apr-27 8:06:53 start ==================
//处理连接的状态机结构
typedef struct 
{
    enum{
        UNCONNECTED = 0,
        NETWORK_CONNECTED=1,
        MQTT_CONNECTED=2,
        SUBSCRIBING_SUCCESS=3,
        WAIT_TIME_OUT=4,
        //SUBSCRIBING_FAILURE = 4
    }state;

    int timeout_s;//超时时间，单位为秒
    int times_count;//累计连续尝试连接次数，在连接成功后清零
}Connection_t;


void connect_time_out(void * data)
{
    Connection_t* con =(Connection_t*)data;

    if(con && con->timeout_s>0)
    {
        con->timeout_s --;
    }
}

#define NETWORK_CONNECT_TIMEOUT 5 //5s
#define MAX_NETWORK_CONNECT_TIMES 5
#define MQTT_CONNECT_TIMEOUT 1 //1s
#define MAX_MQTT_CONNECT_TIMES 5
#define SUBSCRIB_TIMEOUT 1 //1s
#define MAX_SUBSCRIB_TIMES 5
#define MAX_NO_PING_RESPONS_TIMES 10

Connection_t connection={UNCONNECTED,NETWORK_CONNECT_TIMEOUT,0};

//================== Added 2017-Apr-27 8:06:53  end ===================

void messageArrived(MessageData* md)
{
    MQTTMessage* message = md->message;

#if 0 /* Commented @ 2017-Apr-23 1:18:29 */
    if (opts.showtopics)
        rt_kprintf("%.*s\t", md->topicName->lenstring.len, md->topicName->lenstring.data);
    if (opts.nodelimiter)
        rt_kprintf("%.*s", (int)message->payloadlen, (char*)message->payload);
    else
        rt_kprintf("%.*s%s", (int)message->payloadlen, (char*)message->payload, opts.delimiter);
#endif /* Commented */
    dprintf("payloadlen=%d,%s\n",(int)message->payloadlen,(char*)message->payload);
    dprintf("strlen(payload)=%d\n",strlen((char*)message->payload));    
    //fflush(stdout);
    ParseDomoticzMessage((char*)message->payload);

    //dprintf("MSG: qos %d, retained %d, dup %d, packetid %d\n", message->qos, message->retained, message->dup, message->id);
}

void set_host(char *host)
{
    opts.host = host;
}



void domoticz_thread_entry(void* parameter)
{
    int rc = 0;
    unsigned char buf[512]={0};//buf[100];
    unsigned char readbuf[512]={0};//readbuf[100];

    char* topic = "domoticz/out";

    Network n;
    MQTTClient c;

    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;  

    rt_timer_t timer = rt_timer_create("connect_timer", connect_time_out, &connection, RT_TICK_PER_SECOND, RT_TIMER_FLAG_PERIODIC);
    is_over = 0;
    rt_kprintf("domoticz_thread_entry\n");

//================== Added 2017-Apr-26 2:36:53 start ==================
    RegisterHardware(Create_LED0(),2);
    RegisterHardware(Create_LED1(),3);
    OpenHardwares();
    SetupDomoitczMessageParser();   
    SetEnableParseItem(KEY_IDX);
    SetEnableParseItem(KEY_NVALUE);
    SetEnableParseItem(KEY_SWITCH_TYPE);
    initHardwareSettings();
//================== Added 2017-Apr-26 2:36:53  end ===================

    NetworkInit(&n);

    //dprintf("readbuf=%p,readbuf size=%u\n",readbuf,sizeof(readbuf));
    data.willFlag = 0;
    data.MQTTVersion = 3;
    data.clientID.cstring = opts.clientid;
    data.username.cstring = opts.username;
    data.password.cstring = opts.password;

    data.keepAliveInterval = 60;
    data.cleansession = 1;


    rt_timer_start(timer);
    while(!is_over)
    {   
        switch(connection.state)
        {
        case UNCONNECTED:
            if(connection.timeout_s>0)
                continue;
            rc = NetworkConnect(&n, opts.host, opts.port);
            if(rc==0)
            {
                connection.state = NETWORK_CONNECTED;
                connection.times_count = 0;
                rt_kprintf("NetworkConnect ok!\n");
                rt_kprintf("Connecting to %s:%d\n", opts.host, opts.port);
                MQTTClientInit(&c, &n, 1000, buf, sizeof(buf), readbuf, sizeof(readbuf));
            }
            else if(connection.times_count <MAX_NETWORK_CONNECT_TIMES)
            {
                connection.times_count++;
                connection.timeout_s = NETWORK_CONNECT_TIMEOUT;
            }
            else
            {//reset system cpu,restart
                connection.times_count=0;
                rt_thread_delay(RT_TICK_PER_SECOND*600);//10分钟后再连
                //goto exit;
            }
            break;
        case NETWORK_CONNECTED: 
            if(connection.timeout_s>0)
                continue;
            dprintf("\n");
            rc = MQTTConnect(&c, &data);
            dprintf("\n");
            if(rc == SUCCESS)
            {
                connection.state = MQTT_CONNECTED;
                connection.times_count = 0;

                rt_kprintf("MQTTConnected!\n");
                dprintf("Subscribing to %s\n", topic);
            }
            else if(connection.times_count <MAX_MQTT_CONNECT_TIMES)
            {
                rt_kprintf("MQTTConnect times=%d, err:%d! \n",connection.times_count,rc);
                connection.times_count++;
                connection.timeout_s = MQTT_CONNECT_TIMEOUT;
            }
            else
            {//重新进行network连接
                dprintf("\n");
                NetworkDisconnect(&n);
                connection.state = UNCONNECTED;
                connection.times_count=0;
                rt_thread_delay(RT_TICK_PER_SECOND*600);//10分钟后再连
            }
            break;
        case MQTT_CONNECTED:
            if(connection.timeout_s>0)
                continue;
            rc = MQTTSubscribe(&c, topic, opts.qos, messageArrived);
            if(rc == SUCCESS)
            {
                rt_kprintf("Subscribed %s\n", topic);
                connection.state = SUBSCRIBING_SUCCESS;
                connection.times_count = 0;
            }
            else if(connection.times_count <MAX_SUBSCRIB_TIMES)
            {
                rt_kprintf("MQTTSubscribe times=%d, err:%d! \n",connection.times_count,rc);
                connection.times_count++;
                connection.timeout_s = MQTT_CONNECT_TIMEOUT;
            }
            else
            {
                //1分钟后重新进行network连接
                rt_kprintf("MQTTSubscribe err! reconnect after 1 min\n");   
                MQTTDisconnect(&c);
                NetworkDisconnect(&n);
                connection.state = UNCONNECTED;
                connection.times_count=0;
                rt_thread_delay(RT_TICK_PER_SECOND*60);//1分钟后再连
            }
            break;
        case SUBSCRIBING_SUCCESS:
            MQTTYield(&c, 1000);
            if(c.ping_outstanding==1)
            {
                connection.times_count++;
                if(connection.times_count>MAX_NO_PING_RESPONS_TIMES)
                {
                    rt_kprintf("network err! reconnecting ...\n");  
                    MQTTDisconnect(&c);
                    NetworkDisconnect(&n);
                    connection.state = UNCONNECTED;
                    connection.times_count = 0;
                    //rt_thread_delay(RT_TICK_PER_SECOND*60);//1分钟后重连   
                }
            }
            else
            {
                connection.times_count = 0;
            }
            break;
        default:
            break;
        }

    }

exit:
    rt_kprintf("Stopping\n");   
    MQTTDisconnect(&c);
    NetworkDisconnect(&n);

    rt_timer_delete(timer);

}

void domoticz_thread_init(void)
{
    rt_thread_t domoticz_thread;
    domoticz_thread = rt_thread_create("DomoticzThread", domoticz_thread_entry, RT_NULL,
    0xf00, 28, 10);
    if (domoticz_thread != RT_NULL)
        rt_thread_startup(domoticz_thread);

}

#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT(set_host, set domoticz host ip addr);
FINSH_FUNCTION_EXPORT(domoticz_thread_init,to run domoticz thread );
FINSH_FUNCTION_EXPORT(quit_domoticz_thread,quit domoticz thread );
#endif

运行效果：

domoticz这边建立三个LED灯，idx分别为1,2,3

STM32开发板上的LED0的idx为2，LED1的idx为3。
也就是domoticz平台上的“LED灯2”对应开发板LED0；
domoticz平台上的“LED灯3”对应开发板LED1。

好了，现在在STM32开发板上看效果：

1、LED0亮：

2、LED1亮：

3、LED0、LED1都亮：

4、在mini2440板上运行前面做的mqtt客户端程序。

mini2440上也控制两个灯LED0，对应的idx为1；LED1，对应idx为2。
也就是说mini2440板上的LED1和STM32板上的LED0的idx是相同的，看看能不能同时点亮。

点亮mini2440的LED0：

下面将看到在domoticz上点亮LED2灯可以同时点亮mini2440上的LED1和STM32上的LED0：

都点亮：

5、Android手机实际控制效果：

6、当MQTT的broker被关闭并重新打开后，STM32板的反应：

在程序中，其实只要ping 10次没有结果，就会断开MQTT连接和socket连接，并重新连接。
如果有网络错误，连接不上会，延时一段时间，然后重新连接socket，然后连MQTT的broker，然后订阅。
具体如上述源码中处理那样。

附：STM32开发板的整个源码工程下载地址：
http://download.csdn.net/download/sqshining/9828049