tcp_server.py", line 79, in __cb
    fut = self.loop.run_in_executor(None, lambda: self.onMessageReceived(data))
  File "python3.10/asyncio/base_events.py", line 818, in run_in_executor
    executor.submit(func, *args), loop=self)
  File "python3.10/concurrent/futures/thread.py", line 167, in submit
    raise RuntimeError('cannot schedule new futures after shutdown')