test.js

var noble = require('noble');

var ble_UUID =['171a3182907143bfb53a1689b132a533', '9d0bfe96c7bb46c59b35d9abc398c587']; // add your UUIDs to this list...
var ble_serices = 'ffb0';
var red_char = 'ffb1';
var green_char = 'ffb2';
var blue_char = 'ffb3';
var white_char = 'ffb4';

var R=0;
var G=0;
var B=0;
var W=0;

noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
    //
    // Once the BLE radio has been powered on, it is possible
    // to begin scanning for services. Pass an empty array to
    // scan for all services (uses more time and power).
    //
    console.log('scanning...');
    noble.startScanning();
  }
  else {
    noble.stopScanning();
  }
})

setInterval( function(){
  if(noble.state==='poweredOn'){
    noble.startScanning();
    console.log('Starting Scan...');
    setTimeout(function(){
      noble.stopScanning();
      console.log('Stopping Scan...');
    }, 2500)
  }  
}, 3000);


setInterval(function(){W= W + 5; if(R>100) R=0;}, 3000);

noble.on('discover', function(peripheral) {
  // we found a peripheral, stop scanning
  //noble.stopScanning();
  //R = 00;
  //G = 00;
  //B = 00;
  //W = 00;
  
  //console.log('found peripheral:', peripheral.advertisement);

  var advertisement = peripheral.advertisement;
  var localName = advertisement.localName;
  var txPowerLevel = advertisement.txPowerLevel;
  var manufacturerData = advertisement.manufacturerData;
  var serviceData = advertisement.serviceData;
  var serviceUuids = advertisement.serviceUuids;

  ble_UUID.forEach(function(temp){
    if(peripheral.id === temp){
      peripheral.connect(function(err){
        setTimeout(function(){peripheral.disconnect(function(err){});}, 1000);
      	// lets connect...
      	peripheral.discoverServices([ble_serices], function(err, service) {
      		// ask about the services and then...
      		service.forEach(function(service){      			
      			console.log('found service:', service.uuid);
      			//discover characteristics
      			service.discoverCharacteristics([], function(err, characteristics) {
          		characteristics.forEach(function(characteristic) {
                var mybuff = new Buffer(1);
                switch(characteristic.uuid){
                  case red_char:
              			mybuff.writeUInt8(R,0); //write 0 at 0 offset
                		break;
                  case green_char: 
                    mybuff.writeUInt8(G,0); //write 0 at 0 offset
                    break;
                  case blue_char:
                    mybuff.writeUInt8(B,0); //write 0 at 0 offset
                    break;
                  case white_char:
                    mybuff.writeUInt8(W,0); //write 0 at 0 offset
                    break;
                  default:
                    mybuff.writeUInt8(0,0); //write 0 at 0 offset
                    break;
                } // end switch
                console.log('found characteristic:', characteristic.uuid);
                characteristic.write( mybuff, true, function(err){ });
            	}); // End for each characteristic
      			}); // End Service discovery
      		}); //End Service for each
      	}); // End discovery listed services
      }); // End Connect 
    } // End IF Peripheral ID select
  }); // End For each
}); // End on Noble Discover!