def data_to_binary(self):
        """
        :return: bytes
        """
        return bytes([
            COMMAND_CODE,
            self.channels_to_byte(self.relay_channels)]) + \
            struct.pack('>L', self.delay_time)[-3:]
def data_to_binary ( self ) : return bytes ( [ COMMAND_CODE , self . channels_to_byte ( self . relay_channels ) ] ) + struct . pack ( '>L' , self . delay_time ) [ - 3 : ]
:return: bytes