code: def start_change(self, direction):
          
          self.logger.info("Dimmer %s start_change: %s", self.device_id, direction)
  
          if direction == 'up':
              level = '01'
          elif direction == 'down':
              level = '00'
          else:
              self.logger.error("Dimmer %s start_change: %s is invalid, use up or down",
                                self.device_id, direction)
              return False
  
          self.hub.direct_command(self.device_id, '17', level)
          success = self.hub.check_success(self.device_id, '17',
                                           self.hub.brightness_to_hex(level))
          if success:
              self.logger.info("Dimmer %s start_change: Light started changing successfully",
                               self.device_id)
              self.hub.clear_device_command_cache(self.device_id)
          else:
              self.logger.error("Dimmer %s start_change: Light did not change",
                                self.device_id)
  
          return success
docs: Start changing light level manually. Direction should be 'up' or 'down