ops: appliance boot — wait for cameras/LiveKit, power button powers off

README.md

@@ -82,12 +82,29 @@ lightweight high-pass + soft-clip DSP path so streams still work.
 Until the 1 s window is full, hops use the DSP fallback so LiveKit is
 not silent on startup.
 
-## systemd (enabled, 24/7)
+## Appliance boot / power button
 
-Two units, enabled for multi-user.target:
+This box is meant to behave like an appliance:
 
-- `livekit-server.service` — `/usr/local/bin/livekit-server` + `deploy/livekit-server.yaml` (:7880)
-- `livekit-cameras.service` — `run.py` (Requires livekit-server)
+- Power button while **off** → BIOS/OS boot → `livekit-cameras` waits for
+  USB cameras + LiveKit, then publishes.
+- Power button while **on** → full `poweroff` (not sleep). Suspend/hibernate
+  targets are masked. Drop-in:
+  `/etc/systemd/logind.conf.d/50-power-button.conf`
+
+## systemd (enabled)
+
+- `livekit-server.service` — **local TEST** LiveKit on :7880 (autostart for now)
+- `livekit-cameras.service` — publishers. `Wants=` the test server, does not
+  `Require` it. Destination is `LIVEKIT_URL` in `.env` (currently
+  `ws://127.0.0.1:7880`).
+
+When the real/remote LiveKit exists, change `.env` `LIVEKIT_URL` and:
+
+```bash
+systemctl disable --now livekit-server
+systemctl restart livekit-cameras
+```
 
 ```bash
 systemctl status livekit-cameras livekit-server