gistfile1.txt

var mqtt    = require('mqtt');
var client  = mqtt.connect('mqtt://192.168.1.235:1883/',{
  protocolId: 'MQIsdp',
  protocolVersion: 3,
  username: 'user',
  password: 'pass'
});

client.subscribe('foo', function() {
  console.log('subscribed');
});

client.publish('foo', 'bar', function() {
  console.log('published');
});