private async void OnDeviceAdded(object sender, HeartRateLE.Bluetooth.Events.DeviceAddedEventArgs e)
 {
     await RunOnUiThread(() =>
     {
         UnpairedCollection.Add(e.Device);
         Debug.WriteLine("Unpaired Device Added: " + e.Device.Id);
     });
 }
 private async void OnDeviceRemoved(object sender, HeartRateLE.Bluetooth.Events.DeviceRemovedEventArgs e)
 {
     await RunOnUiThread(() =>
     {
         var foundItem = UnpairedCollection.FirstOrDefault(a => a.Id == e.Device.Id);
         if (foundItem != null)
         {
             UnpairedCollection.Remove(foundItem);
         }
         Debug.WriteLine("Unpaired Device Removed: " + e.Device.Id);
     });
 }