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@21:4b8d80bf664f, 2017-05-04 (annotated)
- Committer:
- fpucher
- Date:
- Thu May 04 10:07:14 2017 +0000
- Revision:
- 21:4b8d80bf664f
- Parent:
- 20:49c9daf2b0ff
MQTT Client for mbed LPC1768 and Application Board over Ethernet.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
icraggs | 1:a1d5c7a6acbc | 1 | /******************************************************************************* |
fpucher | 21:4b8d80bf664f | 2 | * Changed: PE, v0.71 works with Ethernet and random Client-ID |
icraggs | 17:0811bdbdd78a | 3 | * Copyright (c) 2014, 2015 IBM Corp. |
icraggs | 1:a1d5c7a6acbc | 4 | * |
icraggs | 1:a1d5c7a6acbc | 5 | * All rights reserved. This program and the accompanying materials |
icraggs | 1:a1d5c7a6acbc | 6 | * are made available under the terms of the Eclipse Public License v1.0 |
icraggs | 1:a1d5c7a6acbc | 7 | * and Eclipse Distribution License v1.0 which accompany this distribution. |
icraggs | 1:a1d5c7a6acbc | 8 | * |
icraggs | 1:a1d5c7a6acbc | 9 | * The Eclipse Public License is available at |
icraggs | 1:a1d5c7a6acbc | 10 | * http://www.eclipse.org/legal/epl-v10.html |
icraggs | 1:a1d5c7a6acbc | 11 | * and the Eclipse Distribution License is available at |
icraggs | 1:a1d5c7a6acbc | 12 | * http://www.eclipse.org/org/documents/edl-v10.php. |
icraggs | 1:a1d5c7a6acbc | 13 | * |
icraggs | 1:a1d5c7a6acbc | 14 | * Contributors: |
icraggs | 1:a1d5c7a6acbc | 15 | * Ian Craggs - initial API and implementation and/or initial documentation |
icraggs | 17:0811bdbdd78a | 16 | * Ian Craggs - make sure QoS2 processing works, and add device headers |
icraggs | 1:a1d5c7a6acbc | 17 | *******************************************************************************/ |
Jan Jongboom |
20:49c9daf2b0ff | 18 | |
fpucher | 21:4b8d80bf664f | 19 | /** |
fpucher | 21:4b8d80bf664f | 20 | This is a sample program to illustrate the use of the MQTT Client library |
fpucher | 21:4b8d80bf664f | 21 | on the mbed platform. The Client class requires two classes which mediate |
fpucher | 21:4b8d80bf664f | 22 | access to system interfaces for networking and timing. As long as these two |
fpucher | 21:4b8d80bf664f | 23 | classes provide the required public programming interfaces, it does not matter |
fpucher | 21:4b8d80bf664f | 24 | what facilities they use underneath. In this program, they use the mbed |
fpucher | 21:4b8d80bf664f | 25 | system libraries. |
Jan Jongboom |
20:49c9daf2b0ff | 26 | |
fpucher | 21:4b8d80bf664f | 27 | */ |
Jan Jongboom |
20:49c9daf2b0ff | 28 | |
fpucher | 21:4b8d80bf664f | 29 | // change this to 0 to output messages to serial instead of LCD |
fpucher | 21:4b8d80bf664f | 30 | #define USE_LCD 0 |
icraggs | 1:a1d5c7a6acbc | 31 | |
icraggs | 18:07a79d8f01c3 | 32 | #if USE_LCD |
icraggs | 17:0811bdbdd78a | 33 | #include "C12832.h" |
icraggs | 2:638c854c0695 | 34 | |
Jan Jongboom |
20:49c9daf2b0ff | 35 | // the actual pins are defined in mbed_app.json and can be overridden per target |
Jan Jongboom |
20:49c9daf2b0ff | 36 | C12832 lcd(LCD_MOSI, LCD_SCK, LCD_MISO, LCD_A0, LCD_NCS); |
icraggs | 17:0811bdbdd78a | 37 | |
Jan Jongboom |
20:49c9daf2b0ff | 38 | #define logMessage lcd.cls();lcd.printf |
Jan Jongboom |
20:49c9daf2b0ff | 39 | |
Jan Jongboom |
20:49c9daf2b0ff | 40 | #else |
Jan Jongboom |
20:49c9daf2b0ff | 41 | |
Jan Jongboom |
20:49c9daf2b0ff | 42 | #define logMessage printf |
icraggs | 18:07a79d8f01c3 | 43 | |
icraggs | 18:07a79d8f01c3 | 44 | #endif |
icraggs | 18:07a79d8f01c3 | 45 | |
icraggs | 17:0811bdbdd78a | 46 | #define MQTTCLIENT_QOS2 1 |
icraggs | 0:0cae29831d01 | 47 | |
Jan Jongboom |
20:49c9daf2b0ff | 48 | #include "easy-connect.h" |
Jan Jongboom |
20:49c9daf2b0ff | 49 | #include "MQTTNetwork.h" |
Jan Jongboom |
20:49c9daf2b0ff | 50 | #include "MQTTmbed.h" |
icraggs | 2:638c854c0695 | 51 | #include "MQTTClient.h" |
icraggs | 2:638c854c0695 | 52 | |
fpucher | 21:4b8d80bf664f | 53 | Serial pc(USBTX, USBRX); |
fpucher | 21:4b8d80bf664f | 54 | |
fpucher | 21:4b8d80bf664f | 55 | static const char alphanum[] = |
fpucher | 21:4b8d80bf664f | 56 | "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
icraggs | 2:638c854c0695 | 57 | |
fpucher | 21:4b8d80bf664f | 58 | int stringLength = sizeof(alphanum) - 1; |
fpucher | 21:4b8d80bf664f | 59 | // use for random |
fpucher | 21:4b8d80bf664f | 60 | #include "MMA7660.h" |
fpucher | 21:4b8d80bf664f | 61 | |
fpucher | 21:4b8d80bf664f | 62 | MMA7660 MMA(p28, p27); |
icraggs | 8:a3e3113054a1 | 63 | |
fpucher | 21:4b8d80bf664f | 64 | char genRandom() |
icraggs | 2:638c854c0695 | 65 | { |
fpucher | 21:4b8d80bf664f | 66 | if (MMA.testConnection()) |
fpucher | 21:4b8d80bf664f | 67 | logMessage("get seed: Please shake the board for 1s \r\n"); |
fpucher | 21:4b8d80bf664f | 68 | int x; |
fpucher | 21:4b8d80bf664f | 69 | for (int i=0; i < 5; i++) { |
fpucher | 21:4b8d80bf664f | 70 | x=(int) (MMA.z() * MMA.z() * MMA.z()*100)% 65; |
fpucher | 21:4b8d80bf664f | 71 | //logMessage("seed: %d\r\n", x); |
fpucher | 21:4b8d80bf664f | 72 | wait_ms(200); |
fpucher | 21:4b8d80bf664f | 73 | } |
fpucher | 21:4b8d80bf664f | 74 | srand (x); |
fpucher | 21:4b8d80bf664f | 75 | return alphanum[rand() % stringLength]; |
icraggs | 2:638c854c0695 | 76 | } |
icraggs | 0:0cae29831d01 | 77 | |
icraggs | 2:638c854c0695 | 78 | int main(int argc, char* argv[]) |
Jan Jongboom |
20:49c9daf2b0ff | 79 | { |
fpucher | 21:4b8d80bf664f | 80 | float version = 0.71; |
fpucher | 21:4b8d80bf664f | 81 | char* topic = "mbed/sample/Eth1"; |
Jan Jongboom |
20:49c9daf2b0ff | 82 | |
fpucher | 21:4b8d80bf664f | 83 | logMessage("MQTT Publish PE: version is %.2f\r\n", version); |
Jan Jongboom |
20:49c9daf2b0ff | 84 | |
fpucher | 21:4b8d80bf664f | 85 | // connect to Ethernet-LAN with DHCP |
Jan Jongboom |
20:49c9daf2b0ff | 86 | NetworkInterface* network = easy_connect(true); |
Jan Jongboom |
20:49c9daf2b0ff | 87 | if (!network) { |
Jan Jongboom |
20:49c9daf2b0ff | 88 | return -1; |
Jan Jongboom |
20:49c9daf2b0ff | 89 | } |
fpucher | 21:4b8d80bf664f | 90 | |
fpucher | 21:4b8d80bf664f | 91 | // connect to broker over Ethernet-LAN |
Jan Jongboom |
20:49c9daf2b0ff | 92 | MQTTNetwork mqttNetwork(network); |
Jan Jongboom |
20:49c9daf2b0ff | 93 | MQTT::Client<MQTTNetwork, Countdown> client = MQTT::Client<MQTTNetwork, Countdown>(mqttNetwork); |
Jan Jongboom |
20:49c9daf2b0ff | 94 | |
fpucher | 21:4b8d80bf664f | 95 | const char* hostname = "broker.hivemq.com"; // local RPi: 172.16.63.188; broker.hivemq.com: 35.157.21.220 |
icraggs | 6:e4c690c45021 | 96 | int port = 1883; |
Jan Jongboom |
20:49c9daf2b0ff | 97 | logMessage("Connecting to %s:%d\r\n", hostname, port); |
fpucher | 21:4b8d80bf664f | 98 | |
Jan Jongboom |
20:49c9daf2b0ff | 99 | int rc = mqttNetwork.connect(hostname, port); |
icraggs | 6:e4c690c45021 | 100 | if (rc != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 101 | logMessage("rc from TCP connect is %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 102 | |
Jan Jongboom |
20:49c9daf2b0ff | 103 | MQTTPacket_connectData data = MQTTPacket_connectData_initializer; |
icraggs | 6:e4c690c45021 | 104 | data.MQTTVersion = 3; |
fpucher | 21:4b8d80bf664f | 105 | |
fpucher | 21:4b8d80bf664f | 106 | // generate a unique random Client-ID |
fpucher | 21:4b8d80bf664f | 107 | char str[20] ="mbed-clientID-"; |
fpucher | 21:4b8d80bf664f | 108 | srand(time(NULL)); |
fpucher | 21:4b8d80bf664f | 109 | int i; |
fpucher | 21:4b8d80bf664f | 110 | for(i = 14; i < 18; ++i) { |
fpucher | 21:4b8d80bf664f | 111 | str[i] = genRandom(); |
fpucher | 21:4b8d80bf664f | 112 | } |
fpucher | 21:4b8d80bf664f | 113 | str[i] = 0; |
fpucher | 21:4b8d80bf664f | 114 | data.clientID.cstring = str; |
fpucher | 21:4b8d80bf664f | 115 | logMessage("ClientID: %s\r\n", data.clientID.cstring); |
fpucher | 21:4b8d80bf664f | 116 | // only if authentication is used (not now): |
fpucher | 21:4b8d80bf664f | 117 | // data.username.cstring = "testuser"; |
fpucher | 21:4b8d80bf664f | 118 | // data.password.cstring = "testpassword"; |
icraggs | 16:28d062c5522b | 119 | if ((rc = client.connect(data)) != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 120 | logMessage("rc from MQTT connect is %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 121 | |
icraggs | 2:638c854c0695 | 122 | MQTT::Message message; |
icraggs | 0:0cae29831d01 | 123 | |
fpucher | 21:4b8d80bf664f | 124 | // publish 5 messages |
fpucher | 21:4b8d80bf664f | 125 | for(int t=0; t<5; t++) { |
fpucher | 21:4b8d80bf664f | 126 | char buf[100]; |
fpucher | 21:4b8d80bf664f | 127 | sprintf(buf, "28.4.2017/16:30/21"); // published message |
fpucher | 21:4b8d80bf664f | 128 | message.qos = MQTT::QOS0; |
fpucher | 21:4b8d80bf664f | 129 | message.retained = false; |
fpucher | 21:4b8d80bf664f | 130 | message.dup = false; |
fpucher | 21:4b8d80bf664f | 131 | message.payload = (void*)buf; |
fpucher | 21:4b8d80bf664f | 132 | message.payloadlen = strlen(buf)+1; |
fpucher | 21:4b8d80bf664f | 133 | rc = client.publish(topic, message); |
fpucher | 21:4b8d80bf664f | 134 | wait(2); |
fpucher | 21:4b8d80bf664f | 135 | } |
Jan Jongboom |
20:49c9daf2b0ff | 136 | |
fpucher | 21:4b8d80bf664f | 137 | // unsubscribe and disconnect from broker |
icraggs | 17:0811bdbdd78a | 138 | if ((rc = client.unsubscribe(topic)) != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 139 | logMessage("rc from unsubscribe was %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 140 | |
icraggs | 8:a3e3113054a1 | 141 | if ((rc = client.disconnect()) != 0) |
Jan Jongboom |
20:49c9daf2b0ff | 142 | logMessage("rc from disconnect was %d\r\n", rc); |
Jan Jongboom |
20:49c9daf2b0ff | 143 | |
Jan Jongboom |
20:49c9daf2b0ff | 144 | mqttNetwork.disconnect(); |
Jan Jongboom |
20:49c9daf2b0ff | 145 | |
fpucher | 21:4b8d80bf664f | 146 | logMessage("Version %.2f: finished\r\n", version); |
Jan Jongboom |
20:49c9daf2b0ff | 147 | |
icraggs | 0:0cae29831d01 | 148 | return 0; |
icraggs | 0:0cae29831d01 | 149 | } |