code: def set_position_fast(self, val):
          
          if val == 0:
              self.close_fast()
          else:
              setlevel = 255
              if val < 1:
                  setlevel = val * 100
              elif val <= 0xff:
                  setlevel = val
              set_command = StandardSend(
                  self._address, COMMAND_LIGHT_ON_FAST_0X12_NONE, cmd2=setlevel)
              self._send_method(set_command, self._open_message_received)
docs: Set the devive OPEN LEVEL.