Since the update to Core 2021.2.1. I also have problems with EDL21.
2021-02-07 20:49:22 ERROR (MainThread) [homeassistant] Error doing job: Task exception was never retrieved
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/sml/asyncio.py", line 104, in _reconnect
await self._disconnect()
File "/usr/local/lib/python3.8/site-packages/sml/asyncio.py", line 130, in _disconnect
self._transport.abort()
File "/usr/local/lib/python3.8/site-packages/serial_asyncio/__init__.py", line 191, in abort
self._abort(None)
File "/usr/local/lib/python3.8/site-packages/serial_asyncio/__init__.py", line 393, in _abort
self._loop.call_soon(self._call_connection_lost, exc)
AttributeError: 'NoneType' object has no attribute 'call_soon'