MQTT Client for mbed LPC1768 and Application Board over Ethernet; publish only.
Dependencies: C12832 MMA7660 MQTT
Fork of HelloMQTT by
Machine-to-Machine-Communication
Das Message Queue Telemetry Transport (MQTT) Protokoll ist ein effizientes Internet of Things (IoT) Protokoll mit wenig Protokolloverhead. Es wurde als lightweight publish/subscribe messaging transport entworfen. Es ist sinnvoll für Verbindungen mit Remote-Standorten, wo nur wenig Resourcen benötigt werden bzw. geringe Bandbreite zur Verfügung steht. Neben MQTT gibt es weitere IoT-Protokoll, wie HTTP, CoAP, XMPP, ... (Überischt über IoT Protokolle). Eine Beschreibung des MQTT ist z.B. hier zu finden.
MQTT implementiert das Publish/Subscribe-Pattern, daher wird ein Brocker für die Vermittlung der Nachrichten (topics) benötigt. Neben vielen quelloffenen Implementierungen (z. B. mosquitto) gibt es auch kommerzielle bzw. freie Server (Broker), die unterschiedliche Features bereit stellen (z. B. den in Deutschland entwickelten HiveMQ).
Für die Programmierung der Clients bzw. Ebedded Systems stehen ebenso sehr viele Libaries in verschiedenen Programmiersprachen zur Verfügung.
Weitere Kommunikationsmöglichkeiten
main.cpp@20:49c9daf2b0ff, 2017-01-10 (annotated)
- Committer:
- Jan Jongboom
- Date:
- Tue Jan 10 18:10:17 2017 -0600
- Revision:
- 20:49c9daf2b0ff
- Parent:
- 19:7f7aba7a4a8b
- Child:
- 21:4b8d80bf664f
Update to mbed OS 5, use NetworkInterface for multiple connectivity methods - not just ethernet
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
icraggs | 1:a1d5c7a6acbc | 1 | /******************************************************************************* |
icraggs | 17:0811bdbdd78a | 2 | * Copyright (c) 2014, 2015 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 | 17:0811bdbdd78a | 15 | * Ian Craggs - make sure QoS2 processing works, and add device headers |
icraggs | 1:a1d5c7a6acbc | 16 | *******************************************************************************/ |
Jan Jongboom |
20:49c9daf2b0ff | 17 | |
icraggs | 2:638c854c0695 | 18 | /** |
icraggs | 2:638c854c0695 | 19 | This is a sample program to illustrate the use of the MQTT Client library |
icraggs | 2:638c854c0695 | 20 | on the mbed platform. The Client class requires two classes which mediate |
icraggs | 2:638c854c0695 | 21 | access to system interfaces for networking and timing. As long as these two |
icraggs | 2:638c854c0695 | 22 | classes provide the required public programming interfaces, it does not matter |
icraggs | 2:638c854c0695 | 23 | what facilities they use underneath. In this program, they use the mbed |
icraggs | 2:638c854c0695 | 24 | system libraries. |
Jan Jongboom |
20:49c9daf2b0ff | 25 | |
icraggs | 2:638c854c0695 | 26 | */ |
Jan Jongboom |
20:49c9daf2b0ff | 27 | |
icraggs | 18:07a79d8f01c3 | 28 | // change this to 0 to output messages to serial instead of LCD |
icraggs | 18:07a79d8f01c3 | 29 | #define USE_LCD 1 |
icraggs | 1:a1d5c7a6acbc | 30 | |
icraggs | 18:07a79d8f01c3 | 31 | #if USE_LCD |
icraggs | 17:0811bdbdd78a | 32 | #include "C12832.h" |
icraggs | 2:638c854c0695 | 33 | |
Jan Jongboom |
20:49c9daf2b0ff | 34 | // the actual pins are defined in mbed_app.json and can be overridden per target |
Jan Jongboom |
20:49c9daf2b0ff | 35 | C12832 lcd(LCD_MOSI, LCD_SCK, LCD_MISO, LCD_A0, LCD_NCS); |
icraggs | 17:0811bdbdd78a | 36 | |
Jan Jongboom |
20:49c9daf2b0ff | 37 | #define logMessage lcd.cls();lcd.printf |
Jan Jongboom |
20:49c9daf2b0ff | 38 | |
Jan Jongboom |
20:49c9daf2b0ff | 39 | #else |
Jan Jongboom |
20:49c9daf2b0ff | 40 | |
Jan Jongboom |
20:49c9daf2b0ff | 41 | #define logMessage printf |
icraggs | 18:07a79d8f01c3 | 42 | |
icraggs | 18:07a79d8f01c3 | 43 | #endif |
icraggs | 18:07a79d8f01c3 | 44 | |
icraggs | 17:0811bdbdd78a | 45 | #define MQTTCLIENT_QOS2 1 |
icraggs | 0:0cae29831d01 | 46 | |
Jan Jongboom |
20:49c9daf2b0ff | 47 | #include "easy-connect.h" |
Jan Jongboom |
20:49c9daf2b0ff | 48 | #include "MQTTNetwork.h" |
Jan Jongboom |
20:49c9daf2b0ff | 49 | #include "MQTTmbed.h" |
icraggs | 2:638c854c0695 | 50 | #include "MQTTClient.h" |
icraggs | 2:638c854c0695 | 51 | |
icraggs | 2:638c854c0695 | 52 | int arrivedcount = 0; |
icraggs | 2:638c854c0695 | 53 | |
icraggs | 8:a3e3113054a1 | 54 | |
icraggs | 9:5beb8609e9f7 | 55 | void messageArrived(MQTT::MessageData& md) |
icraggs | 2:638c854c0695 | 56 | { |
icraggs | 9:5beb8609e9f7 | 57 | MQTT::Message &message = md.message; |
Jan Jongboom |
20:49c9daf2b0ff | 58 | logMessage("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id); |
Jan Jongboom |
20:49c9daf2b0ff | 59 | logMessage("Payload %.*s\r\n", message.payloadlen, (char*)message.payload); |
icraggs | 2:638c854c0695 | 60 | ++arrivedcount; |
icraggs | 2:638c854c0695 | 61 | } |
icraggs | 0:0cae29831d01 | 62 | |
icraggs | 2:638c854c0695 | 63 | |
icraggs | 2:638c854c0695 | 64 | int main(int argc, char* argv[]) |
Jan Jongboom |
20:49c9daf2b0ff | 65 | { |
Jan Jongboom |
20:49c9daf2b0ff | 66 | float version = 0.6; |
icraggs | 2:638c854c0695 | 67 | char* topic = "mbed-sample"; |
Jan Jongboom |
20:49c9daf2b0ff | 68 | |
Jan Jongboom |
20:49c9daf2b0ff | 69 | logMessage("HelloMQTT: version is %.2f\r\n", version); |
Jan Jongboom |
20:49c9daf2b0ff | 70 | |
Jan Jongboom |
20:49c9daf2b0ff | 71 | NetworkInterface* network = easy_connect(true); |
Jan Jongboom |
20:49c9daf2b0ff | 72 | if (!network) { |
Jan Jongboom |
20:49c9daf2b0ff | 73 | return -1; |
Jan Jongboom |
20:49c9daf2b0ff | 74 | } |
Jan Jongboom |
20:49c9daf2b0ff | 75 | |
Jan Jongboom |
20:49c9daf2b0ff | 76 | MQTTNetwork mqttNetwork(network); |
Jan Jongboom |
20:49c9daf2b0ff | 77 | |
Jan Jongboom |
20:49c9daf2b0ff | 78 | MQTT::Client<MQTTNetwork, Countdown> client = MQTT::Client<MQTTNetwork, Countdown>(mqttNetwork); |
Jan Jongboom |
20:49c9daf2b0ff | 79 | |
Jan Jongboom |
20:49c9daf2b0ff | 80 | const char* hostname = "m2m.eclipse.org"; |
icraggs | 6:e4c690c45021 | 81 | int port = 1883; |
Jan Jongboom |
20:49c9daf2b0ff | 82 | logMessage("Connecting to %s:%d\r\n", hostname, port); |
Jan Jongboom |
20:49c9daf2b0ff | 83 | int rc = mqttNetwork.connect(hostname, port); |
icraggs | 6:e4c690c45021 | 84 | if (rc != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 85 | logMessage("rc from TCP connect is %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 86 | |
Jan Jongboom |
20:49c9daf2b0ff | 87 | MQTTPacket_connectData data = MQTTPacket_connectData_initializer; |
icraggs | 6:e4c690c45021 | 88 | data.MQTTVersion = 3; |
icraggs | 8:a3e3113054a1 | 89 | data.clientID.cstring = "mbed-sample"; |
icraggs | 12:086a9314e8a5 | 90 | data.username.cstring = "testuser"; |
icraggs | 12:086a9314e8a5 | 91 | data.password.cstring = "testpassword"; |
icraggs | 16:28d062c5522b | 92 | if ((rc = client.connect(data)) != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 93 | logMessage("rc from MQTT connect is %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 94 | |
icraggs | 19:7f7aba7a4a8b | 95 | if ((rc = client.subscribe(topic, MQTT::QOS2, messageArrived)) != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 96 | logMessage("rc from MQTT subscribe is %d\r\n", rc); |
icraggs | 2:638c854c0695 | 97 | |
icraggs | 2:638c854c0695 | 98 | MQTT::Message message; |
icraggs | 0:0cae29831d01 | 99 | |
icraggs | 2:638c854c0695 | 100 | // QoS 0 |
icraggs | 2:638c854c0695 | 101 | char buf[100]; |
Jan Jongboom |
20:49c9daf2b0ff | 102 | sprintf(buf, "Hello World! QoS 0 message from app version %f\r\n", version); |
icraggs | 2:638c854c0695 | 103 | message.qos = MQTT::QOS0; |
icraggs | 2:638c854c0695 | 104 | message.retained = false; |
icraggs | 2:638c854c0695 | 105 | message.dup = false; |
icraggs | 2:638c854c0695 | 106 | message.payload = (void*)buf; |
icraggs | 2:638c854c0695 | 107 | message.payloadlen = strlen(buf)+1; |
icraggs | 16:28d062c5522b | 108 | rc = client.publish(topic, message); |
icraggs | 12:086a9314e8a5 | 109 | while (arrivedcount < 1) |
icraggs | 2:638c854c0695 | 110 | client.yield(100); |
Jan Jongboom |
20:49c9daf2b0ff | 111 | |
icraggs | 2:638c854c0695 | 112 | // QoS 1 |
Jan Jongboom |
20:49c9daf2b0ff | 113 | sprintf(buf, "Hello World! QoS 1 message from app version %f\r\n", version); |
icraggs | 2:638c854c0695 | 114 | message.qos = MQTT::QOS1; |
icraggs | 2:638c854c0695 | 115 | message.payloadlen = strlen(buf)+1; |
icraggs | 16:28d062c5522b | 116 | rc = client.publish(topic, message); |
icraggs | 12:086a9314e8a5 | 117 | while (arrivedcount < 2) |
icraggs | 2:638c854c0695 | 118 | client.yield(100); |
Jan Jongboom |
20:49c9daf2b0ff | 119 | |
icraggs | 2:638c854c0695 | 120 | // QoS 2 |
Jan Jongboom |
20:49c9daf2b0ff | 121 | sprintf(buf, "Hello World! QoS 2 message from app version %f\r\n", version); |
icraggs | 2:638c854c0695 | 122 | message.qos = MQTT::QOS2; |
icraggs | 2:638c854c0695 | 123 | message.payloadlen = strlen(buf)+1; |
icraggs | 16:28d062c5522b | 124 | rc = client.publish(topic, message); |
icraggs | 12:086a9314e8a5 | 125 | while (arrivedcount < 3) |
icraggs | 2:638c854c0695 | 126 | client.yield(100); |
Jan Jongboom |
20:49c9daf2b0ff | 127 | |
icraggs | 17:0811bdbdd78a | 128 | if ((rc = client.unsubscribe(topic)) != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 129 | logMessage("rc from unsubscribe was %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 130 | |
icraggs | 8:a3e3113054a1 | 131 | if ((rc = client.disconnect()) != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 132 | logMessage("rc from disconnect was %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 133 | |
Jan Jongboom |
20:49c9daf2b0ff | 134 | mqttNetwork.disconnect(); |
Jan Jongboom |
20:49c9daf2b0ff | 135 | |
Jan Jongboom |
20:49c9daf2b0ff | 136 | logMessage("Version %.2f: finish %d msgs\r\n", version, arrivedcount); |
Jan Jongboom |
20:49c9daf2b0ff | 137 | |
icraggs | 0:0cae29831d01 | 138 | return 0; |
icraggs | 0:0cae29831d01 | 139 | } |