Ian Craggs / Mbed OS HelloMQTT

Sample MQTT program - simple send and receive

Dependencies:   C12832 MQTT

Fork of HelloMQTT by MQTT

Linux-example/linux-main.cpp@23:85b0a1df7d75, 2017-10-03 (annotated)

Committer:
icraggs
Date:
Tue Oct 03 22:56:42 2017 +0000
Revision:
23:85b0a1df7d75
Parent:
8:a3e3113054a1 
Update client id and hostname

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icraggs 3:7a6a899de7cc 1 /*******************************************************************************
icraggs 3:7a6a899de7cc 2 * Copyright (c) 2014 IBM Corp.
icraggs 3:7a6a899de7cc 3 *
icraggs 3:7a6a899de7cc 4 * All rights reserved. This program and the accompanying materials
icraggs 3:7a6a899de7cc 5 * are made available under the terms of the Eclipse Public License v1.0
icraggs 3:7a6a899de7cc 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
icraggs 3:7a6a899de7cc 7 *
icraggs 3:7a6a899de7cc 8 * The Eclipse Public License is available at
icraggs 3:7a6a899de7cc 9 * http://www.eclipse.org/legal/epl-v10.html
icraggs 3:7a6a899de7cc 10 * and the Eclipse Distribution License is available at
icraggs 3:7a6a899de7cc 11 * http://www.eclipse.org/org/documents/edl-v10.php.
icraggs 3:7a6a899de7cc 12 *
icraggs 3:7a6a899de7cc 13 * Contributors:
icraggs 3:7a6a899de7cc 14 * Ian Craggs - initial API and implementation and/or initial documentation
icraggs 3:7a6a899de7cc 15 *******************************************************************************/
icraggs 3:7a6a899de7cc 16
icraggs 3:7a6a899de7cc 17 /**
icraggs 3:7a6a899de7cc 18 This is a sample program to illustrate the use of the MQTT Client library
icraggs 3:7a6a899de7cc 19 on Linux. The Client class requires two classes which mediate
icraggs 3:7a6a899de7cc 20 access to system interfaces for networking and timing. As long as these two
icraggs 3:7a6a899de7cc 21 classes provide the required public programming interfaces, it does not matter
icraggs 3:7a6a899de7cc 22 what facilities they use underneath. In this program, they use the Linux
icraggs 3:7a6a899de7cc 23 system libraries.
icraggs 3:7a6a899de7cc 24
icraggs 3:7a6a899de7cc 25 */
icraggs 3:7a6a899de7cc 26
icraggs 3:7a6a899de7cc 27 #if defined(LINUX)
icraggs 3:7a6a899de7cc 28
icraggs 8:a3e3113054a1 29 #include "LinuxMQTT.h"
icraggs 8:a3e3113054a1 30 #include "LinuxIPStack.h"
icraggs 8:a3e3113054a1 31 #include "MQTTClient.h"
icraggs 8:a3e3113054a1 32
icraggs 3:7a6a899de7cc 33 #include <sys/types.h>
icraggs 3:7a6a899de7cc 34 #include <sys/socket.h>
icraggs 3:7a6a899de7cc 35 #include <sys/param.h>
icraggs 3:7a6a899de7cc 36 #include <sys/time.h>
icraggs 3:7a6a899de7cc 37 #include <sys/select.h>
icraggs 3:7a6a899de7cc 38 #include <netinet/in.h>
icraggs 3:7a6a899de7cc 39 #include <netinet/tcp.h>
icraggs 3:7a6a899de7cc 40 #include <arpa/inet.h>
icraggs 3:7a6a899de7cc 41 #include <netdb.h>
icraggs 3:7a6a899de7cc 42 #include <stdio.h>
icraggs 3:7a6a899de7cc 43 #include <unistd.h>
icraggs 3:7a6a899de7cc 44 #include <errno.h>
icraggs 3:7a6a899de7cc 45 #include <fcntl.h>
icraggs 3:7a6a899de7cc 46
icraggs 3:7a6a899de7cc 47 #include <stdlib.h>
icraggs 3:7a6a899de7cc 48 #include <string.h>
icraggs 3:7a6a899de7cc 49 #include <signal.h>
icraggs 3:7a6a899de7cc 50
icraggs 3:7a6a899de7cc 51 #define DEFAULT_STACK_SIZE -1
icraggs 3:7a6a899de7cc 52
icraggs 3:7a6a899de7cc 53
icraggs 3:7a6a899de7cc 54 int arrivedcount = 0;
icraggs 3:7a6a899de7cc 55
icraggs 3:7a6a899de7cc 56 void messageArrived(MQTT::Message* message)
icraggs 3:7a6a899de7cc 57 {
icraggs 3:7a6a899de7cc 58 printf("Message %d arrived: qos %d, retained %d, dup %d, packetid %d\n",
icraggs 3:7a6a899de7cc 59 ++arrivedcount, message->qos, message->retained, message->dup, message->id);
icraggs 3:7a6a899de7cc 60 printf("Payload %.*s\n", message->payloadlen, (char*)message->payload);
icraggs 3:7a6a899de7cc 61 }
icraggs 3:7a6a899de7cc 62
icraggs 3:7a6a899de7cc 63
icraggs 3:7a6a899de7cc 64 int connect(MQTT::Client<IPStack, Countdown>::connectionLostInfo* info)
icraggs 3:7a6a899de7cc 65 {
icraggs 3:7a6a899de7cc 66 const char* hostname = "localhost"; //"m2m.eclipse.org";
icraggs 3:7a6a899de7cc 67 int port = 1883;
icraggs 3:7a6a899de7cc 68 printf("Connecting to %s:%d\n", hostname, port);
icraggs 3:7a6a899de7cc 69 int rc = info->network->connect(hostname, port);
icraggs 3:7a6a899de7cc 70 if (rc != 0)
icraggs 3:7a6a899de7cc 71 printf("rc from TCP connect is %d\n", rc);
icraggs 3:7a6a899de7cc 72
icraggs 3:7a6a899de7cc 73 MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
icraggs 3:7a6a899de7cc 74 data.MQTTVersion = 3;
icraggs 3:7a6a899de7cc 75 data.clientID.cstring = (char*)"mbed-icraggs";
icraggs 3:7a6a899de7cc 76 rc = info->client->connect(&data);
icraggs 3:7a6a899de7cc 77 if (rc != 0)
icraggs 3:7a6a899de7cc 78 printf("rc from MQTT connect is %d\n", rc);
icraggs 3:7a6a899de7cc 79
icraggs 3:7a6a899de7cc 80 return rc;
icraggs 3:7a6a899de7cc 81 }
icraggs 3:7a6a899de7cc 82
icraggs 3:7a6a899de7cc 83
icraggs 3:7a6a899de7cc 84 int main(int argc, char* argv[])
icraggs 3:7a6a899de7cc 85 {
icraggs 3:7a6a899de7cc 86 IPStack ipstack = IPStack();
icraggs 3:7a6a899de7cc 87 float version = 0.3;
icraggs 3:7a6a899de7cc 88 const char* topic = "mbed-sample";
icraggs 3:7a6a899de7cc 89
icraggs 3:7a6a899de7cc 90 printf("Version is %f\n", version);
icraggs 3:7a6a899de7cc 91
icraggs 3:7a6a899de7cc 92 MQTT::Client<IPStack, Countdown> client = MQTT::Client<IPStack, Countdown>(ipstack);
icraggs 3:7a6a899de7cc 93
icraggs 3:7a6a899de7cc 94 client.setConnectionLostHandler(connect);
icraggs 3:7a6a899de7cc 95
icraggs 3:7a6a899de7cc 96 MQTT::Client<IPStack, Countdown>::connectionLostInfo info = {&client, &ipstack};
icraggs 3:7a6a899de7cc 97 int rc = connect(&info);
icraggs 3:7a6a899de7cc 98
icraggs 3:7a6a899de7cc 99 rc = client.subscribe(topic, MQTT::QOS2, messageArrived);
icraggs 3:7a6a899de7cc 100 if (rc != 0)
icraggs 3:7a6a899de7cc 101 printf("rc from MQTT subscribe is %d\n", rc);
icraggs 3:7a6a899de7cc 102
icraggs 3:7a6a899de7cc 103 MQTT::Message message;
icraggs 3:7a6a899de7cc 104
icraggs 3:7a6a899de7cc 105 // QoS 0
icraggs 3:7a6a899de7cc 106 char buf[100];
icraggs 3:7a6a899de7cc 107 sprintf(buf, "Hello World! QoS 0 message from app version %f", version);
icraggs 3:7a6a899de7cc 108 message.qos = MQTT::QOS0;
icraggs 3:7a6a899de7cc 109 message.retained = false;
icraggs 3:7a6a899de7cc 110 message.dup = false;
icraggs 3:7a6a899de7cc 111 message.payload = (void*)buf;
icraggs 3:7a6a899de7cc 112 message.payloadlen = strlen(buf)+1;
icraggs 3:7a6a899de7cc 113 rc = client.publish(topic, &message);
icraggs 3:7a6a899de7cc 114 while (arrivedcount == 0)
icraggs 3:7a6a899de7cc 115 client.yield(100);
icraggs 3:7a6a899de7cc 116
icraggs 3:7a6a899de7cc 117 // QoS 1
icraggs 3:7a6a899de7cc 118 printf("Now QoS 1\n");
icraggs 3:7a6a899de7cc 119 sprintf(buf, "Hello World! QoS 1 message from app version %f", version);
icraggs 3:7a6a899de7cc 120 message.qos = MQTT::QOS1;
icraggs 3:7a6a899de7cc 121 message.payloadlen = strlen(buf)+1;
icraggs 3:7a6a899de7cc 122 rc = client.publish(topic, &message);
icraggs 3:7a6a899de7cc 123 while (arrivedcount == 1)
icraggs 3:7a6a899de7cc 124 client.yield(100);
icraggs 3:7a6a899de7cc 125
icraggs 3:7a6a899de7cc 126 // QoS 2
icraggs 3:7a6a899de7cc 127 sprintf(buf, "Hello World! QoS 2 message from app version %f", version);
icraggs 3:7a6a899de7cc 128 message.qos = MQTT::QOS2;
icraggs 3:7a6a899de7cc 129 message.payloadlen = strlen(buf)+1;
icraggs 3:7a6a899de7cc 130 rc = client.publish(topic, &message);
icraggs 3:7a6a899de7cc 131 while (arrivedcount == 2)
icraggs 3:7a6a899de7cc 132 client.yield(100);
icraggs 3:7a6a899de7cc 133
icraggs 3:7a6a899de7cc 134 rc = client.unsubscribe(topic);
icraggs 3:7a6a899de7cc 135 if (rc != 0)
icraggs 3:7a6a899de7cc 136 printf("rc from unsubscribe was %d\n", rc);
icraggs 3:7a6a899de7cc 137
icraggs 3:7a6a899de7cc 138 rc = client.disconnect();
icraggs 3:7a6a899de7cc 139 if (rc != 0)
icraggs 3:7a6a899de7cc 140 printf("rc from disconnect was %d\n", rc);
icraggs 3:7a6a899de7cc 141
icraggs 3:7a6a899de7cc 142 ipstack.disconnect();
icraggs 3:7a6a899de7cc 143
icraggs 3:7a6a899de7cc 144 printf("Finishing with %d messages received\n", arrivedcount);
icraggs 3:7a6a899de7cc 145
icraggs 3:7a6a899de7cc 146 return 0;
icraggs 3:7a6a899de7cc 147 }
icraggs 3:7a6a899de7cc 148
icraggs 3:7a6a899de7cc 149 #endif