atxserver2重启是出现 provider heartbeat无法重连问题

[codeskyblue]

Traceback (most recent call last):                             
  File "/usr/local/lib/python3.7/site-packages/tornado/ioloop.py", line 605, in _run_callback                                  
    ret = callback()           
  File "/usr/local/lib/python3.7/site-packages/tornado/stack_context.py", line 277, in null_wrapper                            
    return fn(*args, **kwargs) 
  File "/usr/local/lib/python3.7/site-packages/tornado/ioloop.py", line 626, in _discard_future_result                         
    future.result()            
  File "/usr/local/lib/python3.7/site-packages/tornado/concurrent.py", line 238, in result                                     
    raise_exc_info(self._exc_info)                             
  File "<string>", line 4, in raise_exc_info                   
  File "/usr/local/lib/python3.7/site-packages/tornado/gen.py", line 1069, in run                                              
    yielded = self.gen.send(value)                             
  File "<string>", line 6, in _wrap_awaitable                  
  File "/Users/qard3/Deployments/atxserver2-ios-provider/heartbeat.py", line 77, in _drain_queue                               
    await self._ws.write_message(v)                            
  File "/Users/qard3/Deployments/atxserver2-ios-provider/heartbeat.py", line 37, in write_message                              
    return await super().write_message(message)                
TypeError: object NoneType can't be used in 'await' expression