code: def white(self, group=None):
          
          if group is None or group == 0:
              self._send_to_group(group, command="all_white")
              return
          self._send_to_group(group, per_group=True, rgbw_cmd=self.RGBW_GROUP_X_TO_WHITE)
docs: Switch lights on and change color to white.
              If group (1-4) is not specified, all four groups
              will be switched on and to white.