public BleWatcher()
 {
     deviceWatcherHelper = new DeviceWatcherHelper(resultCollection);
     deviceWatcherHelper.DeviceChanged += OnDeviceListChanged;
 }
 public BluetoothWatcher()
 {
     deviceWatcherHelper = new DeviceWatcherHelper(resultCollection, true);
     deviceWatcherHelper.DeviceChanged += OnDeviceListChanged;
 }