From the android app I receive ASCII over the air to the Bluetooth module. From the Blutooth out serial numeric to FT639 which requires 2 bytes as per the send1 or send 2 depending whether or not to move pan servo or tilt servo. The protocol for the 2 bytes is Lower Byte = 0sssxxxx Upper Byte 1sssxxxx sss = servo number xxxx = lower nibble of position byte yyyy = upper nibble of position byte position byte is from 0 - 255.