Ian Craggs / Mbed OS HelloMQTT

Sample MQTT program - simple send and receive

Dependencies:   C12832 MQTT

Fork of HelloMQTT by MQTT

main.cpp@6:4a257f6ac09a, 2014-05-09 (annotated)

Committer:
sam_grove
Date:
Fri May 09 23:06:43 2014 +0000
Revision:
6:4a257f6ac09a
Parent:
3:7a6a899de7cc
Child:
7:3de634f2d40c
Updates to the example to use the virtual serial port and the LCD for feedback

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icraggs 1:a1d5c7a6acbc 1 /*******************************************************************************
icraggs 1:a1d5c7a6acbc 2 * Copyright (c) 2014 IBM Corp.
icraggs 1:a1d5c7a6acbc 3 *
icraggs 1:a1d5c7a6acbc 4 * All rights reserved. This program and the accompanying materials
icraggs 1:a1d5c7a6acbc 5 * are made available under the terms of the Eclipse Public License v1.0
icraggs 1:a1d5c7a6acbc 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
icraggs 1:a1d5c7a6acbc 7 *
icraggs 1:a1d5c7a6acbc 8 * The Eclipse Public License is available at
icraggs 1:a1d5c7a6acbc 9 * http://www.eclipse.org/legal/epl-v10.html
icraggs 1:a1d5c7a6acbc 10 * and the Eclipse Distribution License is available at
icraggs 1:a1d5c7a6acbc 11 * http://www.eclipse.org/org/documents/edl-v10.php.
icraggs 1:a1d5c7a6acbc 12 *
icraggs 1:a1d5c7a6acbc 13 * Contributors:
icraggs 1:a1d5c7a6acbc 14 * Ian Craggs - initial API and implementation and/or initial documentation
icraggs 1:a1d5c7a6acbc 15 *******************************************************************************/
icraggs 2:638c854c0695 16
icraggs 2:638c854c0695 17 /**
icraggs 2:638c854c0695 18 This is a sample program to illustrate the use of the MQTT Client library
icraggs 2:638c854c0695 19 on the mbed platform. The Client class requires two classes which mediate
icraggs 2:638c854c0695 20 access to system interfaces for networking and timing. As long as these two
icraggs 2:638c854c0695 21 classes provide the required public programming interfaces, it does not matter
icraggs 2:638c854c0695 22 what facilities they use underneath. In this program, they use the mbed
icraggs 2:638c854c0695 23 system libraries.
icraggs 2:638c854c0695 24
icraggs 2:638c854c0695 25 */
icraggs 1:a1d5c7a6acbc 26
icraggs 0:0cae29831d01 27 #include "mbed.h"
sam_grove 6:4a257f6ac09a 28 #include "EthernetInterfaceIPStack.h"
icraggs 2:638c854c0695 29
sam_grove 6:4a257f6ac09a 30 #include "C12832.h"
sam_grove 6:4a257f6ac09a 31 C12832 lcd(p5, p7, p6, p8, p11);
icraggs 0:0cae29831d01 32
icraggs 2:638c854c0695 33 #include "FP.cpp"
icraggs 2:638c854c0695 34 #include "MQTTClient.h"
icraggs 2:638c854c0695 35
icraggs 2:638c854c0695 36 int arrivedcount = 0;
icraggs 2:638c854c0695 37
icraggs 2:638c854c0695 38 void messageArrived(MQTT::Message* message)
icraggs 2:638c854c0695 39 {
sam_grove 6:4a257f6ac09a 40 lcd.cls();
sam_grove 6:4a257f6ac09a 41 lcd.locate(0,3);
sam_grove 6:4a257f6ac09a 42 printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\n", message->qos, message->retained, message->dup, message->id);
sam_grove 6:4a257f6ac09a 43 printf("Payload %.*s\n", message->payloadlen, (char*)message->payload);
icraggs 2:638c854c0695 44 ++arrivedcount;
sam_grove 6:4a257f6ac09a 45 lcd.puts((char*)message->payload);
icraggs 2:638c854c0695 46 }
icraggs 0:0cae29831d01 47
icraggs 2:638c854c0695 48 int connect(MQTT::Client<IPStack, Countdown>::connectionLostInfo* info)
icraggs 2:638c854c0695 49 {
icraggs 2:638c854c0695 50 char* hostname = "m2m.eclipse.org";
icraggs 2:638c854c0695 51 int port = 1883;
sam_grove 6:4a257f6ac09a 52
sam_grove 6:4a257f6ac09a 53 lcd.cls();
sam_grove 6:4a257f6ac09a 54 lcd.locate(0,3);
sam_grove 6:4a257f6ac09a 55 lcd.printf("%s:%d\n", hostname, port);
sam_grove 6:4a257f6ac09a 56 printf("Connecting to %s:%d\n", hostname, port);
icraggs 2:638c854c0695 57 int rc = info->network->connect(hostname, port);
sam_grove 6:4a257f6ac09a 58 lcd.printf("TCP connect = %d\n", rc);
sam_grove 6:4a257f6ac09a 59 printf("rc from TCP connect is %d\n", rc);
icraggs 2:638c854c0695 60
icraggs 2:638c854c0695 61 MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
icraggs 2:638c854c0695 62 data.MQTTVersion = 3;
icraggs 2:638c854c0695 63 data.clientID.cstring = "mbed-icraggs";
icraggs 2:638c854c0695 64 rc = info->client->connect(&data);
sam_grove 6:4a257f6ac09a 65 lcd.printf("MQTT connect = %d\n", rc);
sam_grove 6:4a257f6ac09a 66 printf("rc from MQTT connect is %d\n", rc);
icraggs 2:638c854c0695 67
icraggs 2:638c854c0695 68 return rc;
icraggs 2:638c854c0695 69 }
icraggs 2:638c854c0695 70
icraggs 2:638c854c0695 71
icraggs 2:638c854c0695 72 int main(int argc, char* argv[])
icraggs 2:638c854c0695 73 {
icraggs 2:638c854c0695 74 IPStack ipstack = IPStack();
icraggs 2:638c854c0695 75 float version = 0.3;
icraggs 2:638c854c0695 76 char* topic = "mbed-sample";
icraggs 2:638c854c0695 77
icraggs 2:638c854c0695 78 lcd.printf("Version is %f\n", version);
sam_grove 6:4a257f6ac09a 79 printf("Version is %f\n", version);
icraggs 2:638c854c0695 80
icraggs 3:7a6a899de7cc 81 MQTT::Client<IPStack, Countdown> client = MQTT::Client<IPStack, Countdown>(ipstack);
icraggs 3:7a6a899de7cc 82
icraggs 3:7a6a899de7cc 83 client.setConnectionLostHandler(connect);
icraggs 0:0cae29831d01 84
icraggs 2:638c854c0695 85 MQTT::Client<IPStack, Countdown>::connectionLostInfo info = {&client, &ipstack};
icraggs 2:638c854c0695 86 int rc = connect(&info);
icraggs 2:638c854c0695 87
icraggs 2:638c854c0695 88 rc = client.subscribe(topic, MQTT::QOS1, messageArrived);
sam_grove 6:4a257f6ac09a 89 if (rc != 0) {
sam_grove 6:4a257f6ac09a 90 printf("rc from MQTT subscribe is %d\n", rc);
sam_grove 6:4a257f6ac09a 91 }
icraggs 2:638c854c0695 92
icraggs 2:638c854c0695 93 MQTT::Message message;
icraggs 0:0cae29831d01 94
icraggs 2:638c854c0695 95 // QoS 0
icraggs 2:638c854c0695 96 char buf[100];
icraggs 2:638c854c0695 97 sprintf(buf, "Hello World! QoS 0 message from app version %f\n", version);
icraggs 2:638c854c0695 98 message.qos = MQTT::QOS0;
icraggs 2:638c854c0695 99 message.retained = false;
icraggs 2:638c854c0695 100 message.dup = false;
icraggs 2:638c854c0695 101 message.payload = (void*)buf;
icraggs 2:638c854c0695 102 message.payloadlen = strlen(buf)+1;
icraggs 2:638c854c0695 103 rc = client.publish(topic, &message);
icraggs 2:638c854c0695 104 while (arrivedcount == 0)
icraggs 2:638c854c0695 105 client.yield(100);
icraggs 2:638c854c0695 106
icraggs 2:638c854c0695 107 // QoS 1
icraggs 2:638c854c0695 108 sprintf(buf, "Hello World! QoS 1 message from app version %f\n", version);
icraggs 2:638c854c0695 109 message.qos = MQTT::QOS1;
icraggs 2:638c854c0695 110 message.payloadlen = strlen(buf)+1;
icraggs 2:638c854c0695 111 rc = client.publish(topic, &message);
icraggs 2:638c854c0695 112 while (arrivedcount == 1)
icraggs 2:638c854c0695 113 client.yield(100);
icraggs 2:638c854c0695 114
icraggs 2:638c854c0695 115 // QoS 2
icraggs 2:638c854c0695 116 sprintf(buf, "Hello World! QoS 2 message from app version %f\n", version);
icraggs 2:638c854c0695 117 message.qos = MQTT::QOS2;
icraggs 2:638c854c0695 118 message.payloadlen = strlen(buf)+1;
icraggs 2:638c854c0695 119 rc = client.publish(topic, &message);
icraggs 2:638c854c0695 120 while (arrivedcount == 2)
icraggs 2:638c854c0695 121 client.yield(100);
icraggs 2:638c854c0695 122
icraggs 2:638c854c0695 123 rc = client.unsubscribe(topic);
sam_grove 6:4a257f6ac09a 124 if (rc != 0) {
sam_grove 6:4a257f6ac09a 125 printf("rc from unsubscribe was %d\n", rc);
sam_grove 6:4a257f6ac09a 126 }
icraggs 2:638c854c0695 127
icraggs 2:638c854c0695 128 rc = client.disconnect();
sam_grove 6:4a257f6ac09a 129 if (rc != 0) {
sam_grove 6:4a257f6ac09a 130 printf("rc from disconnect was %d\n", rc);
sam_grove 6:4a257f6ac09a 131 }
icraggs 2:638c854c0695 132
icraggs 2:638c854c0695 133 ipstack.disconnect();
icraggs 2:638c854c0695 134
sam_grove 6:4a257f6ac09a 135 lcd.cls();
sam_grove 6:4a257f6ac09a 136 lcd.locate(0,3);
sam_grove 6:4a257f6ac09a 137 lcd.printf("Finish: %d msgs\n", arrivedcount);
sam_grove 6:4a257f6ac09a 138 printf("Finishing with %d messages received\n", arrivedcount);
icraggs 2:638c854c0695 139
icraggs 0:0cae29831d01 140 return 0;
icraggs 0:0cae29831d01 141 }