119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/*******************************************************************************
|
|
* Copyright (c) 2012, 2025 IBM Corp., Ian Craggs
|
|
*
|
|
* All rights reserved. This program and the accompanying materials
|
|
* are made available under the terms of the Eclipse Public License v2.0
|
|
* and Eclipse Distribution License v1.0 which accompany this distribution.
|
|
*
|
|
* The Eclipse Public License is available at
|
|
* https://www.eclipse.org/legal/epl-2.0/
|
|
* and the Eclipse Distribution License is available at
|
|
* http://www.eclipse.org/org/documents/edl-v10.php.
|
|
*
|
|
* Contributors:
|
|
* Ian Craggs - initial contribution
|
|
*******************************************************************************/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "MQTTClient.h"
|
|
|
|
#define ADDRESS "tcp://test.mosquitto.org:1883"
|
|
#define CLIENTID "ExampleClientSub"
|
|
#define TOPIC "MQTT Examples"
|
|
#define PAYLOAD "Hello World!"
|
|
#define QOS 1
|
|
#define TIMEOUT 10000L
|
|
|
|
volatile MQTTClient_deliveryToken deliveredtoken;
|
|
|
|
void delivered(void *context, MQTTClient_deliveryToken dt)
|
|
{
|
|
printf("Message with token value %d delivery confirmed\n", dt);
|
|
deliveredtoken = dt;
|
|
}
|
|
|
|
int msgarrvd(void *context, char *topicName, int topicLen, MQTTClient_message *message)
|
|
{
|
|
printf("Message arrived\n");
|
|
printf(" topic: %s\n", topicName);
|
|
printf(" message: %.*s\n", message->payloadlen, (char*)message->payload);
|
|
MQTTClient_freeMessage(&message);
|
|
MQTTClient_free(topicName);
|
|
return 1;
|
|
}
|
|
|
|
void connlost(void *context, char *cause)
|
|
{
|
|
printf("\nConnection lost\n");
|
|
if (cause)
|
|
printf(" cause: %s\n", cause);
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
MQTTClient client;
|
|
MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
|
|
int rc;
|
|
|
|
const char* uri = (argc > 1) ? argv[1] : ADDRESS;
|
|
printf("Using server at %s\n", uri);
|
|
|
|
if ((rc = MQTTClient_create(&client, uri, CLIENTID,
|
|
MQTTCLIENT_PERSISTENCE_NONE, NULL)) != MQTTCLIENT_SUCCESS)
|
|
{
|
|
printf("Failed to create client, return code %d\n", rc);
|
|
rc = EXIT_FAILURE;
|
|
goto exit;
|
|
}
|
|
|
|
if ((rc = MQTTClient_setCallbacks(client, NULL, connlost, msgarrvd, delivered)) != MQTTCLIENT_SUCCESS)
|
|
{
|
|
printf("Failed to set callbacks, return code %d\n", rc);
|
|
rc = EXIT_FAILURE;
|
|
goto destroy_exit;
|
|
}
|
|
|
|
conn_opts.keepAliveInterval = 20;
|
|
conn_opts.cleansession = 1;
|
|
if ((rc = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS)
|
|
{
|
|
printf("Failed to connect, return code %d\n", rc);
|
|
rc = EXIT_FAILURE;
|
|
goto destroy_exit;
|
|
}
|
|
|
|
printf("Subscribing to topic %s\nfor client %s using QoS%d\n\n"
|
|
"Press Q<Enter> to quit\n\n", TOPIC, CLIENTID, QOS);
|
|
if ((rc = MQTTClient_subscribe(client, TOPIC, QOS)) != MQTTCLIENT_SUCCESS)
|
|
{
|
|
printf("Failed to subscribe, return code %d\n", rc);
|
|
rc = EXIT_FAILURE;
|
|
}
|
|
else
|
|
{
|
|
int ch;
|
|
do
|
|
{
|
|
ch = getchar();
|
|
} while (ch!='Q' && ch != 'q');
|
|
|
|
if ((rc = MQTTClient_unsubscribe(client, TOPIC)) != MQTTCLIENT_SUCCESS)
|
|
{
|
|
printf("Failed to unsubscribe, return code %d\n", rc);
|
|
rc = EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
if ((rc = MQTTClient_disconnect(client, 10000)) != MQTTCLIENT_SUCCESS)
|
|
{
|
|
printf("Failed to disconnect, return code %d\n", rc);
|
|
rc = EXIT_FAILURE;
|
|
}
|
|
destroy_exit:
|
|
MQTTClient_destroy(&client);
|
|
exit:
|
|
return rc;
|
|
}
|