1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// topic_publish.cpp
//
// This is a Paho MQTT C++ client, sample application.
//
// It's an example of how to send messages as an MQTT publisher using the
// C++ asynchronous client interface using a 'topic' object to repeatedly
// send data to the same topic.
//
// The sample demonstrates:
// - Connecting to an MQTT server/broker
// - Publishing messages
// - Use of the 'topic' class
//
/*******************************************************************************
* Copyright (c) 2019-2023 Frank Pagliughi <fpagliughi@mindspring.com>
*
* 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
* http://www.eclipse.org/legal/epl-v20.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Frank Pagliughi - initial implementation and documentation
*******************************************************************************/
#include <atomic>
#include <chrono>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <thread> // For sleep
#include "mqtt/async_client.h"
using namespace std;
const string DFLT_SERVER_URI{"mqtt://localhost:1883"};
const string TOPIC{"test"};
const int QOS = 1;
const char* PAYLOADS[] = {
"Hello World!", "Hi there!", "Is anyone listening?", "Someone is always listening.",
nullptr
};
const auto TIMEOUT = std::chrono::seconds(10);
/////////////////////////////////////////////////////////////////////////////
int main(int argc, char* argv[])
{
string serverURI = (argc > 1) ? string(argv[1]) : DFLT_SERVER_URI;
cout << "Initializing for server '" << serverURI << "'..." << endl;
mqtt::async_client cli(serverURI, "");
cout << " ...OK" << endl;
try {
cout << "\nConnecting..." << endl;
cli.connect()->wait();
cout << " ...OK" << endl;
cout << "\nPublishing messages..." << endl;
mqtt::topic top(cli, "test", QOS);
mqtt::token_ptr tok;
size_t i = 0;
while (PAYLOADS[i]) {
tok = top.publish(PAYLOADS[i++]);
}
tok->wait(); // Just wait for the last one to complete.
cout << "OK" << endl;
// Disconnect
cout << "\nDisconnecting..." << endl;
cli.disconnect()->wait();
cout << " ...OK" << endl;
}
catch (const mqtt::exception& exc) {
cerr << exc << endl;
return 1;
}
return 0;
}
|
