BT module is "linvorV1.8" (HC-06) It responds to only the following AT commands (no CR,LF at the end!) AT AT+VERSION AT+BAUDx AT+NAMEyyyyyy where x= 1---1200 2---2400 3---4800 4---9600 5---19200 6---38400 7---57600 8---115200 9---230400 A---460800 B---921600 C---1382400 It starts in AT mode, gives no status strings on connect, and automaticall switches to data mode after connect. AT commands produce response strings.