mirror of https://github.com/eclipse/paho.mqtt.c
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*******************************************************************************
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* Copyright (c) 2012, 2017 IBM Corp.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v2.0
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* and Eclipse Distribution License v1.0 which accompany this distribution.
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*
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* The Eclipse Public License is available at
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* https://www.eclipse.org/legal/epl-2.0/
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Ian Craggs - initial contribution
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*******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "MQTTClient.h"
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#define ADDRESS "tcp://localhost:1883"
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#define CLIENTID "ExampleClientSub"
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#define TOPIC "MQTT Examples"
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#define PAYLOAD "Hello World!"
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#define QOS 1
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#define TIMEOUT 10000L
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volatile MQTTClient_deliveryToken deliveredtoken;
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void delivered(void *context, MQTTClient_deliveryToken dt)
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{
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printf("Message with token value %d delivery confirmed\n", dt);
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deliveredtoken = dt;
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}
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int msgarrvd(void *context, char *topicName, int topicLen, MQTTClient_message *message)
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{
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int i;
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char* payloadptr;
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printf("Message arrived\n");
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printf(" topic: %s\n", topicName);
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printf(" message: ");
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payloadptr = message->payload;
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for(i=0; i<message->payloadlen; i++)
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{
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putchar(*payloadptr++);
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}
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putchar('\n');
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MQTTClient_freeMessage(&message);
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MQTTClient_free(topicName);
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return 1;
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}
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void connlost(void *context, char *cause)
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{
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printf("\nConnection lost\n");
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printf(" cause: %s\n", cause);
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}
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int main(int argc, char* argv[])
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{
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MQTTClient client;
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MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
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int rc;
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int ch;
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MQTTClient_create(&client, ADDRESS, CLIENTID,
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MQTTCLIENT_PERSISTENCE_NONE, NULL);
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conn_opts.keepAliveInterval = 20;
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conn_opts.cleansession = 1;
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MQTTClient_setCallbacks(client, NULL, connlost, msgarrvd, delivered);
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if ((rc = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS)
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{
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printf("Failed to connect, return code %d\n", rc);
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exit(EXIT_FAILURE);
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}
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printf("Subscribing to topic %s\nfor client %s using QoS%d\n\n"
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"Press Q<Enter> to quit\n\n", TOPIC, CLIENTID, QOS);
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MQTTClient_subscribe(client, TOPIC, QOS);
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do
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{
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ch = getchar();
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} while(ch!='Q' && ch != 'q');
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MQTTClient_unsubscribe(client, TOPIC);
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MQTTClient_disconnect(client, 10000);
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MQTTClient_destroy(&client);
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return rc;
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}
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