core: Suddenly, HA cannot discover xiaomi gateway and xiaomi sensors are unavailable now

The problem

I’m using HA more than one year. I have one xiaomi gateway and some xiaomi sensors. I have automations related with them. Everything was working properly. Recently, HA started not to discover gateway. Sensors seem as unavailable now. Maybe, it has started after a HA update. I didn’t notice. I have reset gateway several times. I disabled LAN from gateway and re-enabled. I have changed the key from gateway and I record the new key in configuration file of HA. I disabled firewall from router. I tried to make MAC as blank in configuration file. I restarted HA after each changes. (I read from HA docs) Nothing worked All other switches and automations are still working properly. Only problem is xiaomi gateway and related sensors etc.

Environment

Here below, screenshot

• Home Assistant Core release with the issue:
• Last working Home Assistant Core release (if known):
• Operating environment (Home Assistant/Supervised/Docker/venv):
• Integration causing this issue:
• Link to integration documentation on our website:

Problem-relevant configuration.yaml

I have tried by making MAC is blank. I have tried with IP address and without IP address. I have tried several options in configuration file. Herebelow, config file.

Traceback/Error logs

Here below, The notification what I see. Also log file

Additional information