code: async def cancel_watchdog(self):
          
          if self._watchdog_task is not None:
              _LOGGER.debug("Canceling Watchdog task.")
              self._watchdog_task.cancel()
              try:
                  await self._watchdog_task
              except asyncio.CancelledError:
                  self._watchdog_task = None
docs: Cancel the watchdog task and related variables.