Connects to the relay automatically on boot (dtrrespect off). The DOS side→relay connection shows up in the server log (journalctl -u quake-nm-relay -f), not here — the emscripten WebSocket lives inside the emulator.

This page opens its own WebSocket to the same /serialbridge endpoint and round-trips a few bytes. If this is green but the relay log shows no DOS connection, the problem is inside DOSBox, not the network.

In DOS: cd \GAMES\QUAKE then run Quake → Multiplayer → Serial → COM1. Bytes will appear in the relay log. (Echo mode bounces them back; switch the relay to pair mode for true 2-player.)