generated from guanyuankai/bonus-edge-proxy
70 lines
2.0 KiB
Groff
70 lines
2.0 KiB
Groff
.TH "pubsync" 3 "Sat Aug 16 2025 14:15:23" "Paho MQTT C Client Library" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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pubsync \- Synchronous publication example
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.PP
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.PP
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.nf
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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://test\&.mosquitto\&.org:1883"
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#define CLIENTID "ExampleClientPub"
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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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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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MQTTClient_message pubmsg = MQTTClient_message_initializer;
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MQTTClient_deliveryToken token;
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int rc;
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if ((rc = MQTTClient_create(&client, ADDRESS, CLIENTID,
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MQTTCLIENT_PERSISTENCE_NONE, NULL)) != MQTTCLIENT_SUCCESS)
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{
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printf("Failed to create client, return code %d\\n", rc);
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exit(EXIT_FAILURE);
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}
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conn_opts\&.keepAliveInterval = 20;
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conn_opts\&.cleansession = 1;
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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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pubmsg\&.payload = PAYLOAD;
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pubmsg\&.payloadlen = (int)strlen(PAYLOAD);
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pubmsg\&.qos = QOS;
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pubmsg\&.retained = 0;
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if ((rc = MQTTClient_publishMessage(client, TOPIC, &pubmsg, &token)) != MQTTCLIENT_SUCCESS)
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{
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printf("Failed to publish message, return code %d\\n", rc);
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exit(EXIT_FAILURE);
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}
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printf("Waiting for up to %d seconds for publication of %s\\n"
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"on topic %s for client with ClientID: %s\\n",
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(int)(TIMEOUT/1000), PAYLOAD, TOPIC, CLIENTID);
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rc = MQTTClient_waitForCompletion(client, token, TIMEOUT);
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printf("Message with delivery token %d delivered\\n", token);
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if ((rc = MQTTClient_disconnect(client, 10000)) != MQTTCLIENT_SUCCESS)
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printf("Failed to disconnect, return code %d\\n", rc);
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MQTTClient_destroy(&client);
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return rc;
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}
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.fi
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.PP
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