private async void Characteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)        {            // BT_Code: An Indicate or Notify reported that the value has changed.            // Display the new value with a timestamp.            var newValue = FormatValueByPresentation(args.CharacteristicValue, presentationFormat);            var message = $"Value at {DateTime.Now:hh:mm:ss}: {newValue}";            await Dispatcher.RunAsync(CoreDispatcherPriority.Normal,                () => CharacteristicLatestValue.Text = message);        }這是值更改的設(shè)置。^ private async void CharacteristicReadButton_Click()        {             // BT_Code: Read the actual value from the device by using Uncached.            GattReadResult result = await selectedCharacteristic.ReadValueAsync(BluetoothCacheMode.Uncached);            if (result.Status == GattCommunicationStatus.Success)            {                string formattedResult = FormatValueByPresentation(result.Value, presentationFormat);                rootPage.NotifyUser($"Read result: {formattedResult}", NotifyType.StatusMessage);            }            else            {                rootPage.NotifyUser($"Read failed: {result.Status}", NotifyType.ErrorMessage);            }             }這是讀取值的設(shè)置。所以當(dāng)我點(diǎn)擊“閱讀”按鈕時。它捕獲當(dāng)時的數(shù)據(jù)。但是我希望在值更改時刷新此數(shù)據(jù)，因此我訂閱了值更改?，F(xiàn)在的問題是，在我點(diǎn)擊訂閱后，它說的是“未知格式”。所以我需要弄清楚如何更改我的格式以讀取我的 rfduino 值。