anchor.diff:              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
               children: <Widget>[
                 RaisedButton (
  -                onPressed: startBroadcast,
  +                onPressed: _startBroadcast,
                   child: Text ("Start Broadcasting",
                     style: TextStyle (color: Colors.white),
                   ),
                 ),
                 RaisedButton (
  -                onPressed: stopBroadcast,
  +                onPressed: _stopBroadcast,
                   child: Text ("Stop Broadcasting",
                     style: TextStyle (color: Colors.white),
                   ),
  
positive.code: 
      SharedPreferences prefs = await SharedPreferences.getInstance();
      prefs.setString('uuid', beaconUuid);
      //uuidTimer.cancel();
      print("Exit beacon");
    }
  
    void checkTime () async {
  
negative.code:       });
      });
  
      _isAdvertisingSubscription = beaconBroadcast.getAdvertisingStateChange().listen((isAdvertising) {
        setState(() {
          _isAdvertising = isAdvertising;
        });
      });
    }
  
    @override
  