“The UART CRC when enabled in DATA_INTERFACE is calculated from and including the original length byte (excl the two CRC bytes), to and including the RSSI append byte (if enabled). Start/stop bytes (if enabled) are not included in the CRC calcalcution. The Wirless M-Bus type of CRC is use (init value 0x0000, polynom 0x3D65, result inverted). LSByte is sent first.
The algorithm to check the CRC would be:
-Remove the start/stop byte
-Remove the two CRC bytes and reduce the length byte by 2 (maybe this was the problem?)
-Then calculate the CRC over the remaining frame (including any RSSI), starting with the length byte Invert the result
-Compare with the received CRC.
Last Update: November 9, 2017