Service to control Philips Hue lights in response to MQTT messages

hue.js

require('es6-promise').polyfill();
var hue = require("node-hue-api"),
  HueApi = hue.HueApi,
  lightState = hue.lightState;
var mqtt = require('mqtt');
var schedule = require('node-schedule');

// Exit once an hour to force a re-read of the Hue lights list
var j = schedule.scheduleJob(new Date((new Date()).getTime()+3600000), function() {
  console.log("[" + new Date() + "] " + "Exiting after pre-set delay.");
  process.exit(0);
});

var config_hue = require("../config/config_hue.js");

var lights = {};

console.log("Connecting to Hue hub " + config_hue.HUB + " as user " + config_hue.USERNAME);
api = new HueApi(config_hue.HUB, config_hue.USERNAME);
state0 = lightState.create().turnOff();
state1 = lightState.create().turnOn().bri(255);

// Populate the lightname=>id lookup table
function extractLightList(result) {
  //console.log(result);
  result.lights.forEach(function (l) {
    lights[l.name] = l.id;
    console.log("Found light '" + l.name + "' with id=" + l.id);
  });
}
api.lights().then(extractLightList).done();

var client = mqtt.connect('mqtt://localhost', {protocolId: 'MQIsdp', protocolVersion: 3});

client.on('connect', function () {
  console.log("Connected to MQTT");
  client.subscribe('Light/#');
});

client.on('message', function (topic, message) {
  console.log("MQTT RX t=" + topic + " m=" + message.toString());

  var tparts = topic.split('/');
  if (tparts.length == 2) {
    try {
      if (tparts[1] in lights) {
        var id = lights[tparts[1]];
        console.log("Using Hue device " + tparts[1] + " id=" + id);

        switch(message.toString()) {
        case 'on':
          api.setLightState(id, state1).done();
          client.publish("Log/Hue/" + tparts[1], 'on');
          break;
        case 'off':
          api.setLightState(id, state0).done();
          client.publish("Log/Hue/" + tparts[1], 'off');
          break;
        }
        var dim = parseInt(message.toString());
        if ((dim >= 0) && (dim <= 255)) {
          api.setLightState(id, lightState.create().on().bri(dim)).done();
          client.publish("Log/Hue/" + tparts[1], 'dim=' + message.toString());
        }
      }
    }
    catch (err) {
      console.log("Error: " + err.message);
    }
  }
});