fix(meta_quest): auto-discovery responder + viewer preview - #15
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…empty On-device diagnosis against a live Quest session showed two reasons the viewer sat empty even though the Unity sender app was running and the adapters were "connected": 1. Quest sender wasn't reaching the Mac's UDP :14043 at all. The Quest app ships with a hardcoded default target IP of ``172.30.1.51`` (a dev LAN from the original project template) and relies on auto-discovery to find the recorder at runtime. MetaQuestHandStream never responded to those discovery probes, so the Quest kept firing UDP into the void while the viewer cheerfully said "connected" (one stale packet from an old session had set the heartbeat). Add a background UDP :14044 responder that replies to the ``SYNCFIELD_DISCOVER_RECORDER_V1`` broadcasts Unity's UDPTrackingSender already emits every 2 s. Reply shape matches the ``RecorderDiscoveryResponse`` parser in the Unity client. We pick the "right" local IP per responder by opening a scratch UDP socket toward the Quest's address and reading getsockname — no packets sent, but the kernel chooses the correct outbound interface, which is the interface the Quest should target. Single-process multi-Quest setups would fight over :14044, so a bind failure silently falls back to "manual IP only" with a log hint. Normal single-Quest use now auto-resolves. 2. MetaQuestCameraStream declared ``kind="video"`` but exposed only ``latest_frame_left`` / ``latest_frame_right``, not the ``latest_frame`` attribute the viewer's StreamSnapshot polls for every video stream. Result: the camera card rendered black even while MjpegPreviewConsumer was happily decoding JPEGs into the per-eye slots. Add a ``latest_frame`` property that returns the left eye (falling back to right) so the existing video panel lights up without any viewer-side changes. Phase-1 caveat still applies: both eyes get the primary-camera view until Meta XR 2.4 exposes per-eye acquisition cleanly (spec §9 Q1). Once that lands ``latest_frame`` can switch to a side-by-side composite. Co-Authored-By: Claude Opus 4.6 <[email protected]>
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Diagnosed on live Quest session
Viewer showed
quest_trackingas 'Waiting for data…' andquest_camas black even though both were 'connected'. Two distinct bugs:Tracking: Quest app's hardcoded target IP is
172.30.1.51(template default from a dev LAN); Mac was on192.168.4.35. Quest's auto-discovery broadcastsSYNCFIELD_DISCOVER_RECORDER_V1on UDP :14044 every 2s but we never responded → Quest stuck sending into the void. Python adapter now listens on :14044 and replies with the correct local IP per outbound interface.Camera preview: MJPEG was actually arriving (verified with
curl /preview/left— valid JPEG bytes), but viewer pollsstream.latest_frame(a single attribute), and MetaQuestCameraStream only exposedlatest_frame_left/latest_frame_right. Added alatest_frameproxy returning the left eye.52 unit tests pass.
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