private void IndicateCharacteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
{
var value = args.CharacteristicValue;
//Debug.WriteLine($"Read data : {BitConverter.ToString(value.ToArray())}");
//Debug.WriteLine($"Read data : {value.Length}");
byte[] readBytes = new byte[value.Length];
using (DataReader reader = DataReader.FromBuffer(value))
{
reader.ReadBytes(readBytes);
}
PenController.OnDataReceived(readBytes);
}