UWP app cannot establish Bluetooth connection to Arduino Uno!

[Ken76]

I have button on my UWP app, which function is to establish Bluetooth connection to Arduino Uno.
But nothing happens when I click it. Is there something I have missed in code?
No error message appears.

Here is the code!

Code: Select all

private void buttonStart_Click(object sender, RoutedEventArgs e)
        {
          BluetoothSerial connection;
          RemoteDevice arduino;
   
          connection = new BluetoothSerial("RNBT-9D4F");
          arduino = new RemoteDevice(connection);
          arduino.DeviceReady += OnDeviceReady;
          connection.begin(115200, SerialConfig.SERIAL_8N1);
       }

[Ken76]

I get this error message.
BluetoothSerial::connectToDeviceAsync failed with a Platform::Exception type. (message: The parameter is incorrect.
No Bluetooth devices found matching the specified identifier.)

Can someone help me?