Stabilize Realtime audio playback and voice sessions - #655
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📝 WalkthroughWalkthroughThe pull request updates connectivity handling, realtime audio transport and buffering, chat-state face behavior, timing documentation, and release metadata. ChangesConnectivity safeguards
Realtime audio transport
Chat-state face UI
Timing documentation and release metadata
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to The PR stabilizes realtime audio playback, session recovery, and conversation status behavior; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant RealtimeModel
participant WebSocketWorker
participant AudioQueue
participant AudioOutput
RealtimeModel->>WebSocketWorker: Configure binary audio
RealtimeModel->>AudioQueue: Buffer response chunks
AudioQueue->>WebSocketWorker: Send audio when capacity allows
WebSocketWorker->>AudioOutput: Deliver buffered audio
RealtimeModel->>AudioQueue: Flush or resume after response completion
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In
`@firmware/host/modules/conversation/__tests__/server-websocket-worker/server-websocket-worker.test.js`:
- Line 147: Remove the duplicate stateAudio declaration in the
server-websocket-worker test, keeping only one ChatAudioIO instance in that
scope so the module parses and the existing assertions can run.
In
`@firmware/host/modules/conversation/chat-audioio/server-openai-realtime-model.js`:
- Around line 229-241: Update onBase64 in server-openai-realtime-model.js to
retain every prebuffered audio span in arrival order and publish the complete
accumulated spans when playback starts or the response ends, rather than only
the final span; update
firmware/host/modules/conversation/__tests__/server-realtime-model/server-realtime-model.test.ts
lines 145-153 to verify the observable ordered audio ranges or total byte
coverage, not merely one receiveAudio event.
In `@firmware/host/modules/ui/views/main/face-view.ts`:
- Around line 99-101: Update the status indicator lifecycle around
setFaceBarVisible and the status reparenting flow so moving it from the AppBar
to main does not stop its animation; either transfer ownership to main or stop
it only while attached to the AppBar. Extend the XS transition test to verify
statusIndicator.running remains true after the AppBar hides, and ensure the test
runs on CoreS3.
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📒 Files selected for processing (30)
.changeset/calm-streaming-audio.mddocs/investigations/realtime-conversation-timing-chart.htmldocs/investigations/streaming-audio-dropouts-2026-08-12.mdfirmware/host/modules/connectivity/__tests__/network-manager.test.tsfirmware/host/modules/connectivity/__tests__/network-service.test.tsfirmware/host/modules/connectivity/__tests__/network-service/manifest.jsonfirmware/host/modules/connectivity/__tests__/safe-readable-socket.test.tsfirmware/host/modules/connectivity/esp32/wifi-power-save.cfirmware/host/modules/connectivity/esp32/wifi-power-save.jsfirmware/host/modules/connectivity/manifest.jsonfirmware/host/modules/connectivity/network-service.tsfirmware/host/modules/connectivity/safe-dns-config.jsfirmware/host/modules/connectivity/safe-readable-socket.tsfirmware/host/modules/conversation/__tests__/server-realtime-model/server-chat-websocket-worker.jsfirmware/host/modules/conversation/__tests__/server-realtime-model/server-realtime-model.test.tsfirmware/host/modules/conversation/__tests__/server-websocket-worker/chat-audioio-base.jsfirmware/host/modules/conversation/__tests__/server-websocket-worker/manifest.test.jsonfirmware/host/modules/conversation/__tests__/server-websocket-worker/server-websocket-worker.test.jsfirmware/host/modules/conversation/__tests__/server-websocket-worker/worker.jsfirmware/host/modules/conversation/chat-audioio/platform-stub.jsfirmware/host/modules/conversation/chat-audioio/server-chat-websocket-worker.jsfirmware/host/modules/conversation/chat-audioio/server-openai-realtime-model.jsfirmware/host/modules/conversation/chat-audioio/worker-stack.jsfirmware/host/modules/conversation/chat.tsfirmware/host/modules/conversation/manifest.jsonfirmware/host/modules/ui/components/status-bar/__tests__/chat-status-bar/chat-status-bar.test.tsfirmware/host/modules/ui/components/status-bar/chat-status-bar.tsfirmware/host/modules/ui/views/main/__tests__/face-view-state/face-view-state.test.tsfirmware/host/modules/ui/views/main/__tests__/face-view-state/manifest.test.jsonfirmware/host/modules/ui/views/main/face-view.ts
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Summary
Root cause
CoreS3 captures showed WSS/TLS delivery gaps of up to about one second. JSON/Base64 increased PCM transfer size by roughly 34%, and server-side realtime pacing provided no lead data to absorb those gaps. At 24 kHz, PCM16 playback requires 48 KB/s while the device observed about 35–36 KB/s, so the PCM ring buffer underflowed. The companion server change defaults to 16 kHz binary PCM, which requires 32 KB/s.
Two independent stalls were also reproduced:
The Moddable SDK source is not patched in this repository. The underlying SDK fixes are proposed separately in Moddable #1678 and Moddable #1679.
What Changed
sample_rate,codec, andencodingfrom the Realtime endpoint and reconfigure playback accordinglyVerification
cd firmware && npm run formatcd firmware && npm run lintcd firmware && npm run test— 388/388 Node.js unit tests passedcd firmware && npm run check:legacy-names/dev/ttyACM0Affected Areas
Release Impact
Release impact: patch.
.changeset/calm-streaming-audio.mdis included.Breaking Changes
Related Issues
Summary by CodeRabbit