# SFU relay (Janus VideoRoom) — lab preview

**Post-alpha product path.** Lab stack: Janus on **cast02**, signaling on app nodes, coturn on cast02.

## Layout

| Path | Role |
|------|------|
| `public/dashboard.php` | Room list / create (auth required) |
| `public/lab.php` | **M0** browser E2E — screen-share publish + subscriber viewer |
| `public/assets/sfu-lab.js` | WebRTC + Janus WS trickle client |
| `public/api/rooms.php` | Room CRUD |
| `public/api/join.php` | JSEP join relay (publisher / subscriber) |
| `ac-deploy/.../smoke_sfu.sh` | Janus + health smoke |

## Lab E2E

1. Sign in on issues console (shared `ac_crash_sess`).
2. Open `/app/androidcast_project/sfu/dashboard` → create room → note **Janus room id**.
3. Open `/app/androidcast_project/sfu/lab` → publish screen share.
4. Second tab/browser → same lab URL → enter room id + **publisher feed id** → Subscribe.

## Next (M2+)

1. Wire cast encoder → SFU publisher (screen share, not camera-only lab).
2. Education screen share on SFU path (replace P2P demo).
3. Session RBAC + stats → graphs.

Android M1: `ac-mobile-android` → Developer settings → **Enable Janus SFU relay lab** → **Open SFU lab**.

See [ac-docs BUILD_DEPLOY](../../ac-docs/BUILD_DEPLOY.md) and cluster `deploy-janus-sfu.sh`.