feat: point the fleet at wss LiveKit room uwh-telhai

Publish and subscribe over wss://livekit.uni-wh.de:7800 and refuse
cleartext ws://. Conference room is uwh-telhai. Includes the uncommitted
encoded H.264 publish path, Rally hairpin, and KMS wall overlay.

discovery.py

@@ -18,6 +18,13 @@ import subprocess
 from dataclasses import dataclass, field
 from pathlib import Path
 
+from usb_ids import (
+    is_fleet_video,
+    is_rally_pid,
+    looks_like_rally_name,
+    usb_vid_pid_of_video_node,
+)
+
 log = logging.getLogger("cameras.discovery")
 
 _SLOTS_FILE = Path(__file__).parent / "slots.json"
@@ -32,6 +39,9 @@ class Camera:
     usb_port: str = ""
     serial: str = ""
     extra_video_devices: list[str] = field(default_factory=list)
+    # None = use fleet VIDEO_WIDTH / VIDEO_HEIGHT (C920 360p). Rally is 720p.
+    width: int | None = None
+    height: int | None = None
 
 
 def select_cameras(cameras: list[Camera], spec: list[str]) -> list[Camera]:
@@ -192,8 +202,18 @@ def discover_cameras() -> list[Camera]:
     for name, nodes in groups.items():
         if not nodes:
             continue
+        if looks_like_rally_name(name):
+            log.info("skipping Rally/speaker device %r (not a cam-NN slot)", name)
+            continue
         nodes.sort(key=lambda n: int(Path(n).name.replace("video", "")))
         primary = nodes[0]
+        ids = usb_vid_pid_of_video_node(primary)
+        if ids is not None and not is_fleet_video(ids[0], ids[1]):
+            log.info("skipping non-C920 USB %04x:%04x at %s", ids[0], ids[1], primary)
+            continue
+        if ids is not None and is_rally_pid(ids[1]):
+            log.info("skipping Rally USB %04x:%04x at %s", ids[0], ids[1], primary)
+            continue
         serial = _serial_of_video_node(primary)
         port = _usb_port_of_video_node(primary)