<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def off(self, group):
 """Turn the LED off for a group."""

        asyncio.ensure_future(self._send_led_on_off_request(group, 0),
                              loop=self._loop)