code: def dim(self, defer_update=False):
          
          msg = X10Send.unit_code_msg(self.address.x10_housecode,
                                      self.address.x10_unitcode)
          self._send_method(msg)
  
          msg = X10Send.command_msg(self.address.x10_housecode,
                                    X10_COMMAND_DIM)
          self._send_method(msg, False)
          if not defer_update:
              self._update_subscribers(self._value - 255 / self._steps)
docs: Dim the device one step.