public void UpdateAdvertisementFilter(BluetoothLEAdvertisementFilter filter)
 {
     advertisementWatcher.AdvertisementFilter = filter;
     if (AdvertisementWatcherStarted)
     {
         advertisementWatcher.Stop();
         Advertisements.Clear();
         advertisementWatcher.Start();
     }
 }
 public void StartAdvertisementWatcher(BluetoothLEScanningMode scanningMode)
 {
     if (!AdvertisementWatcherStarted)
     {
         Advertisements.Clear();
         advertisementWatcher.ScanningMode = scanningMode;
         if (ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 10))
         {
             advertisementWatcher.AllowExtendedAdvertisements = true;
         }
         advertisementWatcher.Start();
         AdvertisementWatcherStarted = true;
     }
 }