| /******************************************************************************* |
| * Copyright (c) 2012, 2020 IBM Corp. |
| * |
| * 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" |
| |
| #if !defined(_WIN32) |
| #include <unistd.h> |
| #else |
| #include <windows.h> |
| #endif |
| |
| #define ADDRESS "tcp://mqtt.eclipse.org:1883" |
| #define CLIENTID "ExampleClientPub" |
| #define TOPIC "MQTT Examples" |
| #define PAYLOAD "Hello World!" |
| #define QOS 1 |
| #define TIMEOUT 10000L |
| |
| 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"); |
| printf(" cause: %s\n", cause); |
| } |
| |
| int main(int argc, char* argv[]) |
| { |
| MQTTClient client; |
| MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer; |
| MQTTClient_message pubmsg = MQTTClient_message_initializer; |
| MQTTClient_deliveryToken token; |
| int rc; |
| |
| if ((rc = MQTTClient_create(&client, ADDRESS, 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; |
| } |
| |
| pubmsg.payload = PAYLOAD; |
| pubmsg.payloadlen = (int)strlen(PAYLOAD); |
| pubmsg.qos = QOS; |
| pubmsg.retained = 0; |
| deliveredtoken = 0; |
| if ((rc = MQTTClient_publishMessage(client, TOPIC, &pubmsg, &token)) != MQTTCLIENT_SUCCESS) |
| { |
| printf("Failed to publish message, return code %d\n", rc); |
| rc = EXIT_FAILURE; |
| } |
| else |
| { |
| printf("Waiting for publication of %s\n" |
| "on topic %s for client with ClientID: %s\n", |
| PAYLOAD, TOPIC, CLIENTID); |
| while (deliveredtoken != token) |
| { |
| #if defined(_WIN32) |
| Sleep(100); |
| #else |
| usleep(10000L); |
| #endif |
| } |
| } |
| |
| 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; |
| } |