Cordova BLE Notify Test using bleno's Test service

index.js

// Cordova project to test BLE notifications
// Run the test service on OS X or Linux with Node.js
// http://bit.ly/bleno-test-service
// characteristic ffffffff-ffff-ffff-ffff-fffffffffff5 will
// increment a counter every 5 seconds notifying this app

// create a new cordova project
// $ cordova create notify com.example.notify Notify
// replace notify/www/js/index.js with this file
// $ cd notify
// $ cordova plugin add cordova-plugin-ble-central
// $ cordova platform add android
// $ cordova run --device

var countDiv = document.createElement('div');
countDiv.style.fontSize = '4em';
countDiv.innerHTML = '-';

var app = {
    initialize: function() {
        this.bindEvents();
        // clober contents of index with new HTML
        document.querySelector('style,[rel="stylesheet"]').remove();
        document.body.innerHTML = 'Notification Test';
        document.body.appendChild(countDiv);
    },
    bindEvents: function() {
        document.addEventListener('deviceready', this.onDeviceReady, false);
    },
    onDeviceReady: function() {
      app.scan();
    },
    scan: function() {
      // http://bit.ly/bleno-test-service
      ble.scan(['ffffffff-ffff-ffff-ffff-fffffffffff0'], 10,
        function(device) {
          console.log('Connecting to ' + device);
          // only expecting 1 service, so just connect
          ble.connect(device.id, app.onConnect, app.onDisconnect);
        },
        function() {
          console.log('Scan Failed');
        }
      );
    },
    onConnect: function(device) {
      console.log('onConnect');
      app.device = device;
      ble.startNotification(device.id,
        'ffffffff-ffff-ffff-ffff-fffffffffff0', // service
        'ffffffff-ffff-ffff-ffff-fffffffffff5', // characteristic
        app.onNotify,
        function() {
          console.log('startNotification failed');
        });
    },
    onDisconnect: function() {
      alert('Disconnected');
    },
    onNotify: function(buffer) {
      var data = new Uint32Array(buffer);
      console.log(data);
      countDiv.innerHTML = data[0];
    }
};

app.initialize();