Package Exports

mqtt
mqtt/lib/browser.js
mqtt/lib/client
mqtt/lib/mqtt.js
mqtt/lib/parsing_utils.js
mqtt/lib/parsing_utils_browser.js
mqtt/test/abstract_client
mqtt/test/server

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (mqtt) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

mqtt.js

Introduction

mqtt.js is a library for the MQTT protocol, written in JavaScript to be used in node.js.

Important notes for existing users

v0.3.0 improves connection stability, performance, the reconnection logic and SSL support. See #118 for details. A Connection is a Writable stream, so you can run MQTT.js over any kind of Stream (doc needed). Both the constructors of MqttClient and MqttConnection changed, but not the factory method mqtt.createClient and mqtt.createConnection.
v0.2.0 has brough some API breaking changes to mqtt.js. Please consult the migration guide for information or open an issue if you need any help.

Installation

npm install mqtt

Example

First you will need to install and run a broker, such as Mosquitto or Mosca, and launch it.

For the sake of simplicity, let's put the subscriber and the publisher in the same file:

var mqtt = require('mqtt')

client = mqtt.createClient(1883, 'localhost');

client.subscribe('presence');
client.publish('presence', 'Hello mqtt');

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

client.end();

output:

Hello mqtt

If you do not want to install a separate broker, you can try using the server/orig example. It implements enough of the semantics of the MQTT protocol to run the example.

Documentation

Detailed documentation can be found in the wiki

Client API usage

See: examples/client

Simple publish client

var mqtt = require('mqtt')
  , client = mqtt.createClient();

client.publish('messages', 'mqtt');
client.publish('messages', 'is pretty cool');
client.publish('messages', 'remember that!', {retain: true});
client.end();

var mqtt = require('mqtt')
  , client = mqtt.createClient();

client.subscribe('messages');
client.publish('messages', 'hello me!');
client.on('message', function(topic, message) {
  console.log(message);
});
client.options.reconnectPeriod = 0;  // disable automatic reconnect

Chainable API!

var mqtt = require('mqtt')
  , client = mqtt.createClient();

client
  .subscribe('messages')
  .publish('presence', 'bin hier')
  .on('message', function(topic, message) {
    console.log(topic);
  });

Server API usage

Broadcast server example

Included in examples/broadcast.js:

var mqtt = require('mqtt');

mqtt.createServer(function(client) {
  var self = this;

  if (!self.clients) self.clients = {};

  client.on('connect', function(packet) {
    client.connack({returnCode: 0});
    client.id = packet.clientId;
    self.clients[client.id] = client;
  });

  client.on('publish', function(packet) {
    for (var k in self.clients) {
      self.clients[k].publish({topic: packet.topic, payload: packet.payload});
    }
  });

  client.on('subscribe', function(packet) {
    var granted = [];
    for (var i = 0; i < packet.subscriptions.length; i++) {
      granted.push(packet.subscriptions[i].qos);
    }

    client.suback({granted: granted, messageId: packet.messageId});
  });

  client.on('pingreq', function(packet) {
    client.pingresp();
  });

  client.on('disconnect', function(packet) {
    client.stream.end();
  });

  client.on('close', function(err) {
    delete self.clients[client.id];
  });

  client.on('error', function(err) {
    client.stream.end();
    console.log('error!');
  });
}).listen(1883);

License

MIT

mqtt