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This is a hacked up proof of concept WebRTC SFU that can run on many things, such as a local OpenWrt AP or in the cloud with Docker Compose/Traefik, including having a group session that spans both at once by backhauling from the AP to the cloud.
It's not production ready, mainly having almost no security! It also lacks quite a lot of potential optimizations. If you need a production video conf system today try https://livekit.io or https://www.daily.co (unaffiliated with either). It's also not very selective, just forwarding everything to everyone.
This began as a fork of the pion example sfu-ws to see if it could run on OpenWrt. https://github.com/pion/example-webrtc-applications/tree/master/sfu-ws
A Selective-Forwarding-Unit is a server that relays incoming traffic from one client by copying it to any number of other clients, system resources permitting. In the context of WebRTC it is decrypting the packets that it receives, and then re-encrypting them before forwarding them on, but it is not actually decoding and reencoding the media streams. A TURN ( https://en.wikipedia.org/wiki/Traversal_Using_Relays_around_NAT ) relay does not decode or decrypt a stream, but does not fan out the incoming traffic, only acting point-to-point, and so serves different purposes.
The semi-novel bit here is the backhaul from the assumed AP host to the cloud. The idea is this reduces load on the link between them, enabling different clients at each end to share the transported media streams.
