def respond(self, response_adu):
log.info('<STR_LIT>'.format(self.client_address[<NUM_LIT:0>],<EOL>hexlify(response_adu)))<EOL>self.request.sendall(response_adu)<EOL>
Send response ADU back to client.

        :param response_adu: A bytearray containing the response of an ADU.