; Sample
var HEART_RATE_SERVICE = "0000180d-0000-1000-8000-00805f9b34fb";
var BATTERY_SERVICE = "0000180f-0000-1000-8000-00805f9b34fb";
var adapter = navigator.mozBluetooth.defaultAdapter;
var serviceUuids = [0x180DHEART_RATE_SERVICE, 0x180FBATTERY_SERVICE]; // heart rate & battery services
var discoveryHandle;