mqtt-router
v0.5.0
Published
Router for mqtt subscriptions.
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Readme
mqtt-router
This module a router for use with MQTT subscriptions.
Installation
npm install mqtt-router
TLDR
If you have just started with MQTT the first thing you will notice is there is only callback registered for on Message, even though you can register multiple subscriptions.. It is therefore up to you the developer to route these to the correct handler, which is why I wrote this library.
I have added a simple override for the topic subscription to enable named params, really this is to avoid the inevitable tokenising of the topic which I do every time I build complex topic structures.
NOTE: I will need to revisit this with some more validation, but for now it works for my simple requirements.
usage
var mqtt = require('mqtt')
, mqttrouter = require('mqtt-router');
var settings = {
reconnectPeriod: 5000
};
// client connection
var client = mqtt.connect('mqtt://localhost', settings);
// enable the subscription router
var router = mqttrouter.wrap(client);
// subscribe to messages for 'hello/me'
router.subscribe('hello/me', function(topic, message){
console.log('received', topic, message);
});
// subscribe to messages for 'hello/you'
router.subscribe('hello/you', function(topic, message){
console.log('received', topic, message);
});
// subscribe to messages for 'some/+/you' with a named param for that token
router.subscribe('some/+:person/you', function(topic, message, params){
console.log('received', topic, message);
});
One thing to note is that subscriptions are refreshed on reconnect, the status of the connection is also
exposed via the isConnected
method.
License
Copyright (c) 2013 Mark Wolfe Licensed under the MIT license.