anchor.diff:        });
       });
   
  -    beaconBroadcast.getAdvertisingStateChange().listen((isAdvertising) {
  +    _isAdvertisingSubscription = beaconBroadcast.getAdvertisingStateChange().listen((isAdvertising) {
         setState(() {
           _isAdvertising = isAdvertising;
         });
       });
  -    
  -    //uuidTimer = Timer.periodic(Duration(seconds: 1), (Timer t) => changeUUID());
     }
   
     @override
  
positive.code: class _BeaconViewState extends State<BeaconView> {
  
    var _isTransmissionSupported;
    var _isAdvertising;
    String broadcastingState = "Currently not broadcasting";
    BeaconBroadcast beaconBroadcast;
    var beaconUuid = 'null';
    Duration uuidDuration;
    var uuidTimer;
  
    @override
    void initState () {
      super.initState();
      print("Enter beacon");
  
      checkTime();
      beaconBroadcast = BeaconBroadcast();
  
negative.code:             mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: <Widget>[
                RaisedButton (
                  onPressed: _startBroadcast,
                  child: Text ("Start Broadcasting",
                    style: TextStyle (color: Colors.white),
                  ),
                ),
                RaisedButton (
                  onPressed: _stopBroadcast,
                  child: Text ("Stop Broadcasting",
                    style: TextStyle (color: Colors.white),
                  ),
  