docs: def run_job(self, job=None):
          """Run a job, either passed in or from the queue.
  
          A job is a tuple of function and optional args. Keyword arguments
          can be passed via use of functools.partial. The job should return a
          string that should be sent by the gateway protocol. The function will
          be called with the arguments and the result will be returned.
          """
          if job is None:
              if not self.queue:
                  return None
              job = self.queue.popleft()
          start = timer()
          func, args = job
          reply = func(*args)
          end = timer()
          if end - start > 0.1:
              _LOGGER.debug(
                  'Handle queue with call %s(%s) took %.3f seconds',
                  func, args, end - start)
          return reply