Check your Bluetooth modules default baud rate. is it 9600? Check the module using a direct serial interface and and read the received code for each character you sent by the software to verify is there any extra characters coming with each frame.
Check your Bluetooth modules default baud rate. is it 9600? Check the module using a direct serial interface and and read the received code for each character you sent by the software to verify is there any extra characters coming with each frame.