MQTT конец, чтобы достичь сообщения о разъединении, получая конечное сообщение, асинхронный

Эта статья адаптирована к

• Обучение для достижения MQTT (с) (асинхронные функции) в языке C под Linux

https://blog.csdn.net/qq_43260665/article/details/88541433

Оригинал выполняется один раз послал сообщение, а затем отключается,

Я положил его в MQTT достичь непрерывной отправки сообщения:

Обсуждение дешево показать мне код!

MQTT publish.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MQTTAsync.h"
#include <unistd.h>

#define ADDRESS     "tcp://localhost:1883"
#define CLIENTID    "ClientPub"
#define TOPIC       "MQTT"
#define PAYLOAD     "Hello World!"
#define QOS         1
#define TIMEOUT     10000L

volatile MQTTAsync_token deliveredtoken;

int finished = 0;
bool is_connect = false;
void connlost(void *context, char *cause)
{
	MQTTAsync client = (MQTTAsync)context;
	MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
	int rc;

	printf("\nConnection lost\n");
	printf("     cause: %s\n", cause);

	printf("Reconnecting\n");
	conn_opts.keepAliveInterval = 20;
	conn_opts.cleansession = 1;
	if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start connect, return code %d\n", rc);
 		finished = 1;
	}
}


void onDisconnect(void* context, MQTTAsync_successData* response)
{
	printf("Successful disconnection\n");
	finished = 1;
}


void onSend(void* context, MQTTAsync_successData* response)
{
	//MQTTAsync client = (MQTTAsync)context;
	//MQTTAsync_disconnectOptions opts = MQTTAsync_disconnectOptions_initializer;
	//int rc;

	printf("Message with token value %d delivery confirmed\n", response->token);
      
	//opts.onSuccess = onDisconnect;
	//opts.context = client;
        /* 
	if ((rc = MQTTAsync_disconnect(client, &opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start sendMessage, return code %d\n", rc);
		exit(EXIT_FAILURE);
	}
          */
}


void onConnectFailure(void* context, MQTTAsync_failureData* response)
{
	printf("Connect failed, rc %d\n", response ? response->code : 0);
	finished = 1;
}


void onConnect(void* context, MQTTAsync_successData* response)
{
	MQTTAsync client = (MQTTAsync)context;
	MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer;
	MQTTAsync_message pubmsg = MQTTAsync_message_initializer;
	int rc;

	printf("Successful connection\n");
	is_connect = true;
/*	opts.onSuccess = onSend;
	opts.context = client;

	pubmsg.payload = (void*)PAYLOAD;
	pubmsg.payloadlen = (int)strlen(PAYLOAD);
	pubmsg.qos = QOS;
	pubmsg.retained = 0;
	deliveredtoken = 0;
        
	    if ((rc = MQTTAsync_sendMessage(client, TOPIC, &pubmsg, &opts)) != MQTTASYNC_SUCCESS)
	    {
		printf("Failed to start sendMessage, return code %d\n", rc);
		exit(EXIT_FAILURE);
	    }
*/        
}


int main(int argc, char* argv[])
{
	MQTTAsync client;
	MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
	int rc;

	MQTTAsync_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL);

	MQTTAsync_setCallbacks(client, NULL, connlost, NULL, NULL);

	conn_opts.keepAliveInterval = 20;
	conn_opts.cleansession = 1;
	conn_opts.onSuccess = onConnect;
	conn_opts.onFailure = onConnectFailure;
	conn_opts.context = client;
        printf("before\n");
	if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start connect, return code %d\n", rc);
		exit(EXIT_FAILURE);
	}
        printf("after\n");
	printf("Waiting for publication of %s\n"
         "on topic %s for client with ClientID: %s\n",
         PAYLOAD, TOPIC, CLIENTID);
        while(!is_connect)
	{
	   printf("sleep\n");
            usleep(10000L);
	}
        
	MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer;
	   
        opts.onSuccess = onSend;
	opts.context = client;

        while(1)
	{
	   
	   int rc;
           printf("while1\n");
           //#define MQTTAsync_message_initializer 
	   MQTTAsync_message pubmsg = MQTTAsync_message_initializer;
	   pubmsg.payload = (void*)PAYLOAD;
	   pubmsg.payloadlen = (int)strlen(PAYLOAD);
	   pubmsg.qos = QOS;
	   pubmsg.retained = 0;
	   deliveredtoken = 0;

	   if ((rc = MQTTAsync_sendMessage(client, TOPIC, &pubmsg, &opts)) != MQTTASYNC_SUCCESS)
	   {
		printf("Failed to start sendMessage, return code %d\n", rc);
		exit(EXIT_FAILURE);
	   }
	   usleep(100000L);
	}

	while (!finished)
		#if defined(WIN32)
			Sleep(100);
		#else
			usleep(10000L);
		#endif

	MQTTAsync_destroy(&client);
 	return rc;
}
  

 

 

subscruib.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MQTTAsync.h"
#include <unistd.h>


#define ADDRESS     "tcp://localhost:1883"
#define CLIENTID    "ClientSub"
#define TOPIC       "MQTT"
#define PAYLOAD     "Hello World!"
#define QOS         1
#define TIMEOUT     10000L

volatile MQTTAsync_token deliveredtoken;

int disc_finished = 0;
int subscribed = 0;
int finished = 0;

void connlost(void *context, char *cause)
{
	MQTTAsync client = (MQTTAsync)context;
	MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
	int rc;

	printf("\nConnection lost\n");
	if (cause)
		printf("     cause: %s\n", cause);

	printf("Reconnecting\n");
	conn_opts.keepAliveInterval = 20;
	conn_opts.cleansession = 1;
	if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start connect, return code %d\n", rc);
		finished = 1;
	}
}


int msgarrvd(void *context, char *topicName, int topicLen, MQTTAsync_message *message)
{
    int i;
    char* payloadptr;

    printf("Message arrived\n");
    printf("     topic: %s\n", topicName);
    printf("   message: ");

    payloadptr = (char*)message->payload;
    for(i=0; i<message->payloadlen; i++)
    {
        putchar(*payloadptr++);
    }
    putchar('\n');
    MQTTAsync_freeMessage(&message);
    MQTTAsync_free(topicName);
    return 1;
}


void onDisconnect(void* context, MQTTAsync_successData* response)
{
	printf("Successful disconnection\n");
	disc_finished = 1;
}


void onSubscribe(void* context, MQTTAsync_successData* response)
{
	printf("Subscribe succeeded\n");
	subscribed = 1;
}

void onSubscribeFailure(void* context, MQTTAsync_failureData* response)
{
	printf("Subscribe failed, rc %d\n", response ? response->code : 0);
	finished = 1;
}


void onConnectFailure(void* context, MQTTAsync_failureData* response)
{
	printf("Connect failed, rc %d\n", response ? response->code : 0);
	finished = 1;
}


void onConnect(void* context, MQTTAsync_successData* response)
{
	MQTTAsync client = (MQTTAsync)context;
	MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer;
	int rc;

	printf("Successful connection\n");

	printf("Subscribing to topic %s\nfor client %s using QoS%d\n\n"
           "Press Q<Enter> to quit\n\n", TOPIC, CLIENTID, QOS);
	opts.onSuccess = onSubscribe;
	opts.onFailure = onSubscribeFailure;
	opts.context = client;

	deliveredtoken = 0;

	if ((rc = MQTTAsync_subscribe(client, TOPIC, QOS, &opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start subscribe, return code %d\n", rc);
		exit(EXIT_FAILURE);
	}
}


int main(int argc, char* argv[])
{
	MQTTAsync client;
	MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
	MQTTAsync_disconnectOptions disc_opts = MQTTAsync_disconnectOptions_initializer;
	int rc;
	int ch;

	MQTTAsync_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL);

	MQTTAsync_setCallbacks(client, client, connlost, msgarrvd, NULL);

	conn_opts.keepAliveInterval = 20;
	conn_opts.cleansession = 1;
	conn_opts.onSuccess = onConnect;
	conn_opts.onFailure = onConnectFailure;
	conn_opts.context = client;
	if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start connect, return code %d\n", rc);
		exit(EXIT_FAILURE);
	}

	while	(!subscribed)
		#if defined(WIN32)
			Sleep(100);
		#else
			usleep(10000L);
		#endif

	if (finished)
		goto exit;

	do 
	{
		ch = getchar();
	} while (ch!='Q' && ch != 'q');

	disc_opts.onSuccess = onDisconnect;
	if ((rc = MQTTAsync_disconnect(client, &disc_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start disconnect, return code %d\n", rc);
		exit(EXIT_FAILURE);
	}
 	while	(!disc_finished)
		#if defined(WIN32)
			Sleep(100);
		#else
			usleep(10000L);
		#endif

exit:
	MQTTAsync_destroy(&client);
 	return rc;
}