http://phantmqtt.sparkfun.com test client

client.js

var mqtt = require('mqtt'),
    client = mqtt.connect('mqtt://phantmqtt.sparkfun.com'),
    pub = 'vGArXg1lPgi4yDPZElO1ilyrEeB',
    prv = 'XpzBK84Xq8Fg3xrOa9NRIEPJ4DV';

client.subscribe('response/' + pub + '/input'); // responses about input
client.subscribe('output/' + pub); // JSON encoded full payload
client.subscribe('output/' + pub + '/b'); // only subscribe to one field

// log everything to the terminal
client.on('message', function(topic, message) {
  console.log('TOPIC: ' + topic, '  PAYLOAD: ' + message);
});

// log data
client.publish('input/' + pub + '/' + prv, JSON.stringify({
  a: 1,
  b: 'test'
}));

package.json

{
  "name": "mqtt-client-test",
  "version": "0.0.0",
  "description": "test client for phantmqtt.sparkfun.com",
  "main": "client.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "mqtt": "^0.3.11"
  }
}