Alex X

1. First you have to make sure that the stream uses the H264 codec. Because H265 will be through MSE anyway. 2. It's reasonable to use TURN from Nabu Casa...

Adding TURN from Nabu Casa to a custom card isn't easy. I don't have time for that yet. And need to ask HA core team for permission to do it....

HA supports connecting to your own go2rtc installation (for advanced users) https://www.home-assistant.io/integrations/go2rtc/ For basic users, everything is done in such a way that they don't even know what go2rtc is....

1. The current architecture of HA does not allow keeping any process constantly running inside HA. It will be rebooted together with HA. My custom component has been working exactly...

You can check active streams in the go2rtc WebUI.

Show stream info

You're looking at a part of the code that doesn't relate to the problem at all.

I don't know if companion app can work with relative links.

Many locks doesn't have statuses. They only have events. Event is an action in some moment. Events only fire if something have changed.

Your method ok. If you can see event in MiHome and can't see event in Hass logs - I have never heard about this situation for 4 years of developing...