Mosquitto

http://mosquitto.org/

Serveur MQTT écrit en C et C++

Installation rapide et simple

Premiers pas

Installation

sur Raspberry Pi

wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py -O - | python
sudo python get-pip.py

sur MacOS X

brew install mosquitto

sur Ubuntu

http://mosquitto.org/2013/01/mosquitto-debian-repository/

Lancement du broker

Lancez le broker Mosquitto sur l'hôte (10.0.1.3). Remarque : le broker est parfois lancé via initd (vérifiez avec ps -ax | grep mosquitto )

mosquitto

Publication & Souscription

Command lines

Publication en CLI

Publication depuis le Raspberry Pi http://mosquitto.org/man/mosquitto_pub-1.html

BROKER=10.0.1.3
mosquitto_pub -h $BROKER -d -t arduino/temp -m "100"

Souscription en CLI

Souscription depuis l'hôte http://mosquitto.org/man/mosquitto_sub-1.html

BROKER=10.0.1.3
mosquitto_sub -h $BROKER -d -t arduino/temp

Python

Publication en Python

RPI + Arduino running Mosquitto MQTT publisher

Agrisensor pushing MQTT messages

Car park sensor pushing MQTT messages

Publication depuis le Raspberry Pi (et un Arduino) http://mosquitto.org/documentation/python/

BROKER=10.0.1.3
python publisharduino.py $BROKER

#!/usr/bin/python
#
# simple app to read string from serial port (arduino board)
# and publish via MQTT
#
# uses the Python MQTT client from the Mosquitto project
# http://mosquitto.org
#
# initially Andy Piper http://andypiper.co.uk
# 2011/09/15

import serial
import mosquitto
import os
import sys

broker=sys.argv[1]
port = 1883

serialdev = '/dev/ttyACM0'



#MQTT callbacks

def on_connect(mosq, obj, rc):
    if rc == 0:
        print("Connected successfully.")
    else:
        raise Exception


def on_disconnect(mosq, obj, rc):
    print("Disconnected successfully.")


def on_publish(mosq, obj, mid):
    print("Message "+str(mid)+" published.")


def on_subscribe(mosq, obj, mid, qos_list):
    print("Subscribe with mid "+str(mid)+" received.")


def on_unsubscribe(mosq, obj, mid):
    print("Unsubscribe with mid "+str(mid)+" received.")


def on_message(mosq, obj, msg):
    print("Message received on topic "+msg.topic+" with QoS "+str(msg.qos)+" and payload "+msg.payload)


#called on exit
#close serial, disconnect MQTT
def cleanup():
    print "Ending and cleaning up"
    ser.close()
    mqttc.disconnect()

try:
    print "Connecting... ", serialdev
    #connect to serial port
    ser = serial.Serial(serialdev, 9600, timeout=20)
except:
    print "Failed to connect serial"
    #unable to continue with no serial input
    raise SystemExit


try:
    ser.flushInput()
    #create an mqtt client
    mypid = os.getpid()
    client_uniq = "arduino_pub_"+str(mypid)
    mqttc = mosquitto.Mosquitto(client_uniq)

    #attach MQTT callbacks
    mqttc.on_connect = on_connect
    mqttc.on_disconnect = on_disconnect
    mqttc.on_publish = on_publish
    mqttc.on_subscribe = on_subscribe
    mqttc.on_unsubscribe = on_unsubscribe
    #mqttc.on_message = on_message

    #connect to broker
    mqttc.connect(broker, port, 60)

    #remain connected to broker
    #read data from serial and publish
    while mqttc.loop() == 0:
        line = ser.readline()
        #split line as it contains V,temp
        list = line.split(",")
        #second list element is temp
        temp = list[0].rstrip()
        print("Temp is "+temp)
        mqttc.publish("arduino/temp", temp)
        pass


# handle list index error (i.e. assume no data received)
except (IndexError):
    print "No data received within serial timeout period"
    cleanup()
# handle app closure
except (KeyboardInterrupt):
    print "Interrupt received"
    cleanup()
except (RuntimeError):
    print "uh-oh! time to die"
    cleanup()

Souscription en Python

Souscription depuis l'hôte http://mosquitto.org/documentation/python/

BROKER=10.0.1.3
python subscribearduino.py $BROKER

#!/usr/bin/python
#
# simple app to subscribe MQTT topic
#
# uses the Python MQTT client from the Mosquitto project
# http://mosquitto.org
#
# initially Andy Piper http://andypiper.co.uk
# 2011/09/15

import os
import mosquitto
import sys

broker=sys.argv[1]
#broker = "10.0.1.3"
port = 1883

serialdev = '/dev/ttyACM0'

#MQTT callbacks

def on_connect(mosq, obj, rc):
    if rc == 0:
        print("Connected successfully.")
    else:
        raise Exception

def on_disconnect(mosq, obj, rc):
    print("Disconnected successfully.")


def on_publish(mosq, obj, mid):
    print("Message "+str(mid)+" published.")


def on_subscribe(mosq, obj, mid, qos_list):
    print("Subscribe with mid "+str(mid)+" received.")


def on_unsubscribe(mosq, obj, mid):
    print("Unsubscribe with mid "+str(mid)+" received.")


def on_message(mosq, obj, msg):
    print("Message received on topic "+msg.topic+" with QoS "+str(msg.qos)+" and payload "+msg.payload)


#called on exit
# disconnect MQTT
def cleanup():
    print "Ending and cleaning up"
    mqttc.disconnect()

try:
    #create an mqtt client
    mypid = os.getpid()
    client_uniq = "arduino_pub_"+str(mypid)
    mqttc = mosquitto.Mosquitto(client_uniq)

    #attach MQTT callbacks
    mqttc.on_connect = on_connect
    mqttc.on_disconnect = on_disconnect
    mqttc.on_publish = on_publish
    mqttc.on_subscribe = on_subscribe
    mqttc.on_unsubscribe = on_unsubscribe
    mqttc.on_message = on_message

    #connect to broker
    mqttc.connect(broker, port, 60)

    mqttc.subscribe("arduino/temp")

    #remain connected to broker
    while mqttc.loop() == 0:
        pass


# handle app closure
except (KeyboardInterrupt):
    print "Interrupt received"
    cleanup()
except (RuntimeError):
    print "uh-oh! time to die"
    cleanup()

Node.js

Souscription avec Node.js

npm install mqtt
BROKER=10.0.1.3
node subscribe.js $BROKER 1883 arduino/temp

#!/usr/bin/env node

var mqtt = require('mqtt');

var argv = process.argv;

for (var i = 2; i <= 4; i++) {
  if(!argv[i]) process.exit(-1);
}

var port = argv[3]
  , host = argv[2]
  , topic = argv[4];

var c = mqtt.createClient(port, host);

c.on('connect', function() {

  c.on('message', function(topic, message) {
    console.log(topic + ' ' + message);
  });

  c.subscribe(topic);
});

Simple Souscripteur avec une interface Web

npm install mqtt
npm install express
BROKER=10.0.1.3
node webmqttsub.js $BROKER 1883 arduino/#

node webmqttsub.js $BROKER 1883 bbc/#

curl http://localhost:3000/*
curl http://localhost:3000/arduino/
curl http://localhost:3000/arduino/temp

// Simple Gateway between MQTT et HTTP (REST)

// Author: Didier Donsez, 2013
// TODO add PUT, POST (publish), DELETE method

var mqtt = require('mqtt');

var argv = process.argv;

for (var i = 2; i <= 4; i++) {
  if(!argv[i]) process.exit(-1);
}

var brokerport = argv[3]
  , brokerhost = argv[2]
  , subscribedtopicpattern = argv[4];

var topics = new Object();

var c = mqtt.createClient(brokerport, brokerhost);

c.on('connect', function() {

  c.on('message', function(topic, message) {
    console.log("receive "+ topic + ' ' + message);
      topics[topic]=message;
  });

  console.log("subscribe to " + subscribedtopicpattern);
  c.subscribe(subscribedtopicpattern);
});

var express = require('express');
var app = express();
app.use(function(req, res, next){
    var path=req.path;
    console.log('req.path=' + path);
    if(path=="/*"){
	res.set('Content-Type', 'application/json');
	res.send(JSON.stringify(topics));
     } else {
         var topic=path.substring(1);
	 if (topics.hasOwnProperty(topic))  {
	     if(req.get('Content-Type')=='application/json'){
		 res.set('Content-Type', 'application/json');
		 res.send( '{"'+topic+'","'+topics[topic]+'"}' );
	     } else { 
		 res.set('Content-Type', 'text/plain');
		 res.send(topics[topic]);
	     }
	 } else {
	     res.send(404, 'Sorry, we cannot find topic '+ topic);
	 }
     }
});
app.listen(3000);

Publication avec Node.js

#!/usr/bin/env node

var mqtt = require('mqtt');

var argv = process.argv;

for (var i = 2; i <= 5; i++) {
  if(!argv[i]) process.exit(-1);
}

var port = argv[3]
  , host = argv[2]
  , topic = argv[4];
  , message = argv[5];

var c = mqtt.createClient(port, host);

c.on('connect', function() {

  c.on('subscribe', function(packet) {
      console.log("subscribe" + ' ' + packet);
  });

  c.on('close', function() {
      console.log("close");
  });

  c.on('disconnect', function(packet) {
      console.log("disconnect" + ' ' + packet);
  });

  c.on('error', function(e) {
     console.log("error" + ' ' + packet);
  });


  c.publish(topic, message);

  c.end();

});

npm install mqtt
BROKER=10.0.1.3
node publish.js $BROKER 1883 arduino/temp "99999999"

Bridge HTTP REST <--> MQTT

BROKER=test.mosquitto.org
mosquitto_sub -h test.mosquitto.org -t "arduino/#" -v

BROKER=test.mosquitto.org
mosquitto_pub -h test.mosquitto.org -t "arduino/temp" -m "246"

BRIDGE=http://test-mosquitto.herokuapp.com
curl $BRIDGE/arduino/temp
curl -X PUT --data-binary "247" $BRIDGE/arduino/temp
curl -X POST --data-binary "248" $BRIDGE/arduino/temp

...

curl -X DELETE $BRIDGE/arduino/temp

Node-RED

Node RED with MQTT

TODO with Arduino, Firmata, MQTT

Start the subscription

BROKER=test.mosquitto.org
mosquitto_sub -h $BROKER -d -t smartgrid/uk

node red.js

Browse http://127.0.0.1:1880

Import (Ctrl-I) the following flow then deploy. The flow gets UK smartgrid data from http://www.nationalgrid.com/ngrealtime/realtime/systemdata.aspx every minute, then parses it into a message then publishes the message on the smartgrid/uk topic of the test.mosquitto.org public server. The flow is inspired from the Node-RED documentation.

[{"id":"5ff55c38.ef0014","type":"mqtt-broker","broker":"test.mosquitto.org","port":"1883"},{"id":"26aba4b0.704bb4","type":"mqtt out","name":"Mosquitto Server","topic":"smartgrid/uk","broker":"5ff55c38.ef0014","x":462,"y":611,"wires":[]},{"id":"963ae491.d8ac68","type":"debug","name":"Debug MQTT","active":true,"complete":"false","x":472,"y":664,"wires":[]},{"id":"b52ffa92.d6b9c","type":"http request","name":"UK National Grid Open Data","method":"GET","url":"http://www.nationalgrid.com/ngrealtime/realtime/systemdata.aspx","x":171,"y":499,"wires":[["dbe1deb4.42e0d8"]]},{"id":"dbe1deb4.42e0d8","type":"function","name":"Parsing Grid Data","func":"// The received message is stored in 'msg'\n// It will have at least a 'payload' property:\n//   console.log(msg.payload);\n// The 'context' object is available to store state\n// between invocations of the function\n//   context = {};\n\n    // does a simple text extract parse of the http output to provide an\n    // object containing the uk power demand, frequency and time\n    \n    console.log(msg.payload);\n    \n    if (~msg.payload.indexOf('<BR')) {\n      var words = msg.payload.split(\"div\")[1].split(\"<BR\");\n      if (words.length >= 3) {\n        msg.payload = {};\n        msg.payload.demand = parseInt(words[0].split(\":\")[1]);\n        msg.payload.frequency = parseFloat(words[2].split(\":\")[1]);\n        msg.payload.time = words[1].split(\">\")[1];\n        \n        // Create the true/false signal based on the frequency.\n        msg2 = {};\n        msg2.payload = (msg.payload.frequency >= 50) ? true : false;\n        \n        return [msg,msg2];\n      }\n    }\n    return null;","outputs":1,"x":408,"y":502,"wires":[["26aba4b0.704bb4","963ae491.d8ac68","c3092d54.828b5"]]},{"id":"1e20ecfd.c0c393","type":"inject","name":"Every minute","topic":"","payload":"","repeat":"0","crontab":"*/1 0-22 * * *","once":true,"x":147,"y":378,"wires":[["b52ffa92.d6b9c"]]},{"id":"c3092d54.828b5","type":"exec","command":"echo 'New UK Smart Grid data !' | terminal-notifier -sound default","append":"","useSpawn":"","name":"Notify","x":460,"y":723,"wires":[[],[],[]]}]

Examples

• Arduino-Based Sensor for Agriculture