/**
* Set light on/off
*
* @param bool $flag
* True for on, false for off
*
* @return self This object
*/
public function setOn($flag = true)
{
$x = new SetLightState($this);
$y = $x->on((bool) $flag);
$this->client->sendCommand($y);
$this->attributes->state->on = (bool) $flag;
return $this;
}