That's quite a cool hack, but as I mentioned elsewhere in this discussion it's still a lot of infrastructure to let a user connect to a device on their own lan, and it still presupposes that the user will have a robust internet connection when they need to use the device.

That makes a lot of sense for Plex, but it's really not applicable for my equipment.

Interesting. I’m currently working on an “IoT” device and this seems like it could theoretically work. One concern I have is that there’s an initial step where the device creates an access point so that you can enter wifi credentials that it will use to connect to your home network. In this case, the device connecting to the local server will not have internet access, and would not be able to resolve the plex.direct domain. Maybe I can rely on the browser dns cache, but that seems pretty sketchy...