The app is terminal application, it can transaction data between Bluetooth device.
it's can save all send and receive data to file.
file save in /sdcard/********.log
******** is yyyyMMdd.

description for setup in menu
Display hexadecimal : show data of hexadecimal format.
Send hexadecimal : sned hexadecimal text. ex, "ABC 39 30", client will receive "ABC90". hex 39 = "9" hex 30 = "0".
Append newline(\r\n) : sent data append newline automatically.
Keep screen on : keep the screen on.

note :
1.Your data must have a newline. the APP is relying newline to display data.
2.This application is reprograming of BluetoothChat. that's sample code of android.com.