start mqtt client (based on paho.mqtt.c), basically works
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218
3rd/paho.mqtt.c/src/samples/MQTTAsync_publish_time.c
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218
3rd/paho.mqtt.c/src/samples/MQTTAsync_publish_time.c
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/*******************************************************************************
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* Copyright (c) 2012, 2023 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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* Frank Pagliughi - loop to repeatedly read and sent time values.
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*******************************************************************************/
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// This is a somewhat contrived example to show an application that publishes
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// continuously, like a data acquisition app might do. In this case, though,
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// we don't have a sensor to read, so we use the system time as the number
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// of milliseconds since the epoch to simulate a data input.
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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 <stdint.h>
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#include <time.h>
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#include "MQTTAsync.h"
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#if !defined(_WIN32)
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#include <unistd.h>
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#else
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#include <windows.h>
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#include <Minwinbase.h>
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#endif
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#if defined(_WRS_KERNEL)
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#include <OsWrapper.h>
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#endif
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#if defined(_WIN32)
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#define snprintf _snprintf
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#endif
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// Better not to flood a public broker. Test against localhost.
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#define ADDRESS "mqtt://localhost:1883"
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#define CLIENTID "ExampleClientTimePub"
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#define TOPIC "data/time"
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#define QOS 1
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#define TIMEOUT 10000L
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#define SAMPLE_PERIOD 10L // in ms
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volatile int finished = 0;
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volatile int connected = 0;
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void connlost(void *context, char *cause)
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{
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MQTTAsync client = (MQTTAsync)context;
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MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
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int rc;
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printf("\nConnection lost\n");
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if (cause)
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printf(" cause: %s\n", cause);
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printf("Reconnecting\n");
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conn_opts.keepAliveInterval = 20;
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conn_opts.cleansession = 1;
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if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
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{
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printf("Failed to start connect, return code %d\n", rc);
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finished = 1;
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}
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}
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void onDisconnectFailure(void* context, MQTTAsync_failureData* response)
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{
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printf("Disconnect failed\n");
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finished = 1;
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}
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void onDisconnect(void* context, MQTTAsync_successData* response)
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{
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printf("Successful disconnection\n");
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finished = 1;
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}
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void onSendFailure(void* context, MQTTAsync_failureData* response)
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{
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MQTTAsync client = (MQTTAsync)context;
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MQTTAsync_disconnectOptions opts = MQTTAsync_disconnectOptions_initializer;
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int rc;
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printf("Message send failed token %d error code %d\n", response->token, response->code);
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opts.onSuccess = onDisconnect;
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opts.onFailure = onDisconnectFailure;
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opts.context = client;
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if ((rc = MQTTAsync_disconnect(client, &opts)) != MQTTASYNC_SUCCESS)
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{
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printf("Failed to start disconnect, return code %d\n", rc);
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exit(EXIT_FAILURE);
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}
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}
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void onSend(void* context, MQTTAsync_successData* response)
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{
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// This gets called when a message is acknowledged successfully.
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}
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void onConnectFailure(void* context, MQTTAsync_failureData* response)
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{
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printf("Connect failed, rc %d\n", response ? response->code : 0);
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finished = 1;
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}
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void onConnect(void* context, MQTTAsync_successData* response)
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{
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printf("Successful connection\n");
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connected = 1;
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}
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int messageArrived(void* context, char* topicName, int topicLen, MQTTAsync_message* m)
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{
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/* not expecting any messages */
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return 1;
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}
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int64_t getTime(void)
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{
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#if defined(_WIN32)
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FILETIME ft;
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GetSystemTimeAsFileTime(&ft);
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return ((((int64_t) ft.dwHighDateTime) << 8) + ft.dwLowDateTime) / 10000;
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#else
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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return ((int64_t) ts.tv_sec * 1000) + ((int64_t) ts.tv_nsec / 1000000);
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#endif
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}
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int main(int argc, char* argv[])
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{
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MQTTAsync client;
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MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
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MQTTAsync_message pubmsg = MQTTAsync_message_initializer;
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MQTTAsync_responseOptions pub_opts = MQTTAsync_responseOptions_initializer;
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int rc;
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if ((rc = MQTTAsync_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL)) != MQTTASYNC_SUCCESS)
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{
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printf("Failed to create client object, return code %d\n", rc);
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exit(EXIT_FAILURE);
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}
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if ((rc = MQTTAsync_setCallbacks(client, client, connlost, messageArrived, NULL)) != MQTTASYNC_SUCCESS)
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{
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printf("Failed to set callback, 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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conn_opts.onSuccess = onConnect;
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conn_opts.onFailure = onConnectFailure;
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conn_opts.context = client;
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if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
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{
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printf("Failed to start connect, return code %d\n", rc);
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exit(EXIT_FAILURE);
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}
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while (!connected) {
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#if defined(_WIN32)
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Sleep(100);
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#else
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usleep(100000L);
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#endif
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}
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while (!finished) {
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int64_t t = getTime();
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char buf[256];
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int n = snprintf(buf, sizeof(buf), "%lld", (long long) t);
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printf("%s\n", buf);
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pub_opts.onSuccess = onSend;
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pub_opts.onFailure = onSendFailure;
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pub_opts.context = client;
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pubmsg.payload = buf;
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pubmsg.payloadlen = n;
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pubmsg.qos = QOS;
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pubmsg.retained = 0;
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if ((rc = MQTTAsync_sendMessage(client, TOPIC, &pubmsg, &pub_opts)) != MQTTASYNC_SUCCESS)
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{
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printf("Failed to start sendMessage, return code %d\n", rc);
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exit(EXIT_FAILURE);
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}
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#if defined(_WIN32)
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Sleep(SAMPLE_PERIOD);
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#else
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usleep(SAMPLE_PERIOD * 1000);
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#endif
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}
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MQTTAsync_destroy(&client);
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return rc;
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}
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