Hi Marcel, Actually we are using the Silicon wave Bluetooth device that is compatible with the BCSP when it configured for 3 WIRE H5 protocol. As per our study on 3 WIRE protcol (H5 ) from bluetooth.org specification. The H5 and BCSP seems to be almost same except the protocol number and Initialization process.The H5 3 WIRE UART Transport layer specification document is attached for your kind reference. Thanks and regards Hariharan.V