When disconnecting the client, we have to cancel the uaclient _publish_task.

If we don't, this can prevent reconnection since the task is still running, and the previous task instance could be hanging on a previous request that has never completed (i.e network issue).

Yes, there's no timeout on request coming from the publish_loop, so we
must ensure the publish_task is always cancelled. Hence, the
uaclient.close_session is always called on disconnect.

asyncua/client/client.py

@@ -517,7 +517,10 @@ class Client:
         Close session
         """
         self._renew_channel_task.cancel()
-        await self._renew_channel_task
+        try:
+            await self._renew_channel_task
+        except Exception:
+            _logger.exception("Error while closing secure channel loop")
         return await self.uaclient.close_session(True)
 
     def get_root_node(self):