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Link-drop section: replug outage is invisible to link state

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Measured: plugging the hub's PD back in leaves the Orin's USB interface
up while the tablet stops answering for ~5 s, which only a heartbeat
detects.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mikkeli
2026-10-09 00:25:55 +09:00
parent 5bff21265b
commit 6300006859
1 changed files with 2 additions and 1 deletions
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docs/ARCHITECTURE.md
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@@ -155,7 +155,8 @@ change. Design for it as normal operation. Requirements, not yet implemented:
- **Failure detection on the Orin.** An app-level heartbeat with a timeout of a - **Failure detection on the Orin.** An app-level heartbeat with a timeout of a
few seconds, not TCP alone. A connection on a link that went down can stay few seconds, not TCP alone. A connection on a link that went down can stay
half-open long after the app has re-dialled. Reap dead connections and their half-open long after the app has re-dialled. Reap dead connections and their
per-client queues promptly. per-client queues promptly. Link state doesn't help either: when PD is plugged back
in, the Orin's interface stays up while the tablet goes silent for ~5 s.
- **Downstream (latest-wins):** unchanged. On reconnect, push current state; no - **Downstream (latest-wins):** unchanged. On reconnect, push current state; no
resend, since stale samples are worthless. resend, since stale samples are worthless.
- **Reliable channel (TTS chunks, acknowledgements):** pending items survive a - **Reliable channel (TTS chunks, acknowledgements):** pending items survive a