#include <stdio.h> #include <stdlib.h> #include <string.h> #include "MQTTClient.h" #define ADDRESS "tcp://localhost:1883" #define CLIENTID "ExampleClientPub" #define TOPIC "MQTT Examples" #define PAYLOAD "Hello World!" #define QOS 1 #define TIMEOUT 10000L 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; MQTTClient_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL); 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); exit(EXIT_FAILURE); } pubmsg.payload = PAYLOAD; pubmsg.payloadlen = strlen(PAYLOAD); pubmsg.qos = QOS; pubmsg.retained = 0; MQTTClient_publishMessage(client, TOPIC, &pubmsg, &token); printf("Waiting for up to %d seconds for publication of %s\n" "on topic %s for client with ClientID: %s\n", (int)(TIMEOUT/1000), PAYLOAD, TOPIC, CLIENTID); rc = MQTTClient_waitForCompletion(client, token, TIMEOUT); printf("Message with delivery token %d delivered\n", token); MQTTClient_disconnect(client, 10000); MQTTClient_destroy(&client); return rc; }