code: def _schedule(self):
          '''Schedule check function.'''
          if self._running:
              _logger.debug('Schedule check function.')
              self._call_later_handle = self._event_loop.call_later(
                  self._timeout, self._checkf _schedule(self):
          '''Schedule check function.'''
          if self._running:
              _logger.debug('Schedule check function.')
              self._call_later_handle = self._event_loop.call_later(
                  self._timeout, self._check)
docs: Schedule check function.