Ian Craggs / Mbed OS HelloMQTT

Sample MQTT program - simple send and receive

Dependencies:   C12832 MQTT

Fork of HelloMQTT by MQTT

main.cpp@8:a3e3113054a1, 2014-05-20 (annotated)

Committer:
icraggs
Date:
Tue May 20 15:08:05 2014 +0000
Revision:
8:a3e3113054a1
Parent:
7:3de634f2d40c
Child:
9:5beb8609e9f7
Refactoring headers

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 2:638c854c0695 27
sam_grove 6:4a257f6ac09a 28 #include "C12832.h"
sam_grove 6:4a257f6ac09a 29 C12832 lcd(p5, p7, p6, p8, p11);
icraggs 0:0cae29831d01 30
icraggs 8:a3e3113054a1 31 #include "MQTTEthernet.h"
icraggs 2:638c854c0695 32 #include "MQTTClient.h"
icraggs 2:638c854c0695 33
icraggs 2:638c854c0695 34 int arrivedcount = 0;
icraggs 2:638c854c0695 35
icraggs 8:a3e3113054a1 36
icraggs 2:638c854c0695 37 void messageArrived(MQTT::Message* message)
icraggs 2:638c854c0695 38 {
sam_grove 6:4a257f6ac09a 39 lcd.cls();
sam_grove 6:4a257f6ac09a 40 lcd.locate(0,3);
sam_grove 6:4a257f6ac09a 41 printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\n", message->qos, message->retained, message->dup, message->id);
sam_grove 6:4a257f6ac09a 42 printf("Payload %.*s\n", message->payloadlen, (char*)message->payload);
icraggs 2:638c854c0695 43 ++arrivedcount;
sam_grove 6:4a257f6ac09a 44 lcd.puts((char*)message->payload);
icraggs 2:638c854c0695 45 }
icraggs 0:0cae29831d01 46
icraggs 2:638c854c0695 47
icraggs 2:638c854c0695 48 int main(int argc, char* argv[])
icraggs 2:638c854c0695 49 {
icraggs 8:a3e3113054a1 50 MQTTEthernet ipstack = MQTTEthernet();
icraggs 8:a3e3113054a1 51 float version = 0.46;
icraggs 2:638c854c0695 52 char* topic = "mbed-sample";
icraggs 2:638c854c0695 53
icraggs 2:638c854c0695 54 lcd.printf("Version is %f\n", version);
sam_grove 6:4a257f6ac09a 55 printf("Version is %f\n", version);
icraggs 2:638c854c0695 56
icraggs 8:a3e3113054a1 57 MQTT::Client<MQTTEthernet, Countdown> client = MQTT::Client<MQTTEthernet, Countdown>(ipstack);
icraggs 3:7a6a899de7cc 58
icraggs 4:e4c690c45021 59 char* hostname = "m2m.eclipse.org";
icraggs 4:e4c690c45021 60 int port = 1883;
icraggs 4:e4c690c45021 61 lcd.printf("Connecting to %s:%d\n", hostname, port);
icraggs 4:e4c690c45021 62 int rc = ipstack.connect(hostname, port);
icraggs 4:e4c690c45021 63 if (rc != 0)
icraggs 4:e4c690c45021 64 lcd.printf("rc from TCP connect is %d\n", rc);
icraggs 4:e4c690c45021 65
icraggs 4:e4c690c45021 66 MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
icraggs 4:e4c690c45021 67 data.MQTTVersion = 3;
icraggs 8:a3e3113054a1 68 data.clientID.cstring = "mbed-sample";
icraggs 8:a3e3113054a1 69 if ((rc = client.connect(&data)) != 0)
icraggs 4:e4c690c45021 70 lcd.printf("rc from MQTT connect is %d\n", rc);
icraggs 2:638c854c0695 71
icraggs 8:a3e3113054a1 72 if ((rc = client.subscribe(topic, MQTT::QOS1, messageArrived)) != 0)
icraggs 8:a3e3113054a1 73 lcd.printf("rc from MQTT subscribe is %d\n", rc);
icraggs 2:638c854c0695 74
icraggs 2:638c854c0695 75 MQTT::Message message;
icraggs 0:0cae29831d01 76
icraggs 2:638c854c0695 77 // QoS 0
icraggs 2:638c854c0695 78 char buf[100];
icraggs 2:638c854c0695 79 sprintf(buf, "Hello World! QoS 0 message from app version %f\n", version);
icraggs 2:638c854c0695 80 message.qos = MQTT::QOS0;
icraggs 2:638c854c0695 81 message.retained = false;
icraggs 2:638c854c0695 82 message.dup = false;
icraggs 2:638c854c0695 83 message.payload = (void*)buf;
icraggs 2:638c854c0695 84 message.payloadlen = strlen(buf)+1;
icraggs 2:638c854c0695 85 rc = client.publish(topic, &message);
icraggs 2:638c854c0695 86 while (arrivedcount == 0)
icraggs 2:638c854c0695 87 client.yield(100);
icraggs 2:638c854c0695 88
icraggs 2:638c854c0695 89 // QoS 1
icraggs 2:638c854c0695 90 sprintf(buf, "Hello World! QoS 1 message from app version %f\n", version);
icraggs 2:638c854c0695 91 message.qos = MQTT::QOS1;
icraggs 2:638c854c0695 92 message.payloadlen = strlen(buf)+1;
icraggs 2:638c854c0695 93 rc = client.publish(topic, &message);
icraggs 2:638c854c0695 94 while (arrivedcount == 1)
icraggs 2:638c854c0695 95 client.yield(100);
icraggs 2:638c854c0695 96
icraggs 2:638c854c0695 97 // QoS 2
icraggs 2:638c854c0695 98 sprintf(buf, "Hello World! QoS 2 message from app version %f\n", version);
icraggs 2:638c854c0695 99 message.qos = MQTT::QOS2;
icraggs 2:638c854c0695 100 message.payloadlen = strlen(buf)+1;
icraggs 2:638c854c0695 101 rc = client.publish(topic, &message);
icraggs 2:638c854c0695 102 while (arrivedcount == 2)
icraggs 2:638c854c0695 103 client.yield(100);
icraggs 2:638c854c0695 104
icraggs 8:a3e3113054a1 105 if ((rc = client.unsubscribe(topic)) != 0)
sam_grove 6:4a257f6ac09a 106 printf("rc from unsubscribe was %d\n", rc);
icraggs 2:638c854c0695 107
icraggs 8:a3e3113054a1 108 if ((rc = client.disconnect()) != 0)
sam_grove 6:4a257f6ac09a 109 printf("rc from disconnect was %d\n", rc);
icraggs 2:638c854c0695 110
icraggs 2:638c854c0695 111 ipstack.disconnect();
icraggs 2:638c854c0695 112
sam_grove 6:4a257f6ac09a 113 lcd.cls();
sam_grove 6:4a257f6ac09a 114 lcd.locate(0,3);
icraggs 8:a3e3113054a1 115 lcd.printf("Version %.2f: finish %d msgs\n", version, arrivedcount);
sam_grove 6:4a257f6ac09a 116 printf("Finishing with %d messages received\n", arrivedcount);
icraggs 2:638c854c0695 117
icraggs 0:0cae29831d01 118 return 0;
icraggs 0:0cae29831d01 119 }