I have 2 devices which are connected together from serial port (RX,TX)
1) "raspberry pi"
2) "Serial Bluetooth Module" http://www.instructables.com/id/Cheap-2-Way-Bluetooth-Connection-Between-Arduino-a/
= the bluetooth module cannot be discovered by Raspberry pi.
= javax.bluetooth.BluetoothStateException: Bluetooth Device is not availablelogout
it works perfectly if i use USB bluetooth plugin dongle, but it failed for "Serial Bluetooth Module"
My code as below with 3 external Jar files included (bluecove, pi4j, java