def METHOD_NAME(self, request_pdu):
    logger.debug("Requested to report slave ID (0x11)")
    response = struct.pack(">B", 0x11)  # function code
    response += struct.pack(">B", 1)  # byte count
    response += struct.pack(">B", 1)  # slave id
    response += struct.pack(">B", 0xFF)  # run status, OxFF on, 0x00 off
    return response