mikkeli
77952cb6c1
Replaces `type: default` — one value across every document, read by nothing, so it discriminated nothing. Types are now reference, guidelines, plan and report, applied to every markdown file with no exceptions for the hub. Plans carry status and updated, reports carry date. REPOS.md already noted that plans go stale and reports do not, but nothing made that visible: a plan from months ago looked identical to one written today. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013kj58Jugkic783b8ZrtTVZ
72 lines
3.0 KiB
Markdown
72 lines
3.0 KiB
Markdown
---
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type: plan
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status: active
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updated: 2026-09-04
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---
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# Initial plan
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## Order
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1. MQTT client, subscribing to the retained vehicle topics. Text readout only —
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prove the contract before drawing anything.
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2. Gauges.
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3. Moving map: MapLibre against the PMTiles basemap served by the Orin, with the
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position from `yukart/gnss/fix`. No routing involved.
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4. Guidance from `yukart/nav/guidance`, once [svc-nav](gitea:yukart/svc-nav) publishes it.
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A moving map with position, heading and trace is most of the value in a car and
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needs no routing engine at all. Routing is the expensive last fraction.
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## Open
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- **Transport.** Over USB the tablet has an IP link via RNDIS, so it can reach the
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broker directly. Whether it should, or should go through `svc-gw`, is decided in
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that repo — see its initial plan.
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- **CJK labels.** MapLibre cannot ship Japanese glyph sets as SDF ranges. Local
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font rendering must be configured, or labels will be slow or absent.
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- **Sunlight.** A typical tablet is unreadable through a windscreen in daylight.
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This is a hardware problem, but the UI should not make it worse.
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## The boundary, from this side
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Two channels with different guarantees, not one socket:
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| | Down (state) | Up (commands) |
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|---|---|---|
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| Transport | push stream | request/response |
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| Loss | tolerated; next sample supersedes | **not** tolerated; retry until acknowledged |
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| On reconnect | expect current state immediately | resend anything pending |
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This client always initiates and owns reconnection — the Orin never dials out.
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Assume the link drops constantly: cable knocked, screen off, WiFi lost.
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## Session marking is worth building early
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A button that stamps an event (`indicator on`, `cold start`, `hard braking`) into
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the recording, on the same clock as the CAN frames, turns the Phase 1 manual event
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log from a notebook-and-wristwatch exercise into structured data. It is what makes
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a raw capture decodable later, and it is a Phase 1 capability that happens to live
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in this repo.
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## Mock data must look like mock data
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`svc-gw` can synthesise vehicle state without any real readings, which is how this
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app is developed with no Jetson present. The stream carries a flag when it does.
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Rendering synthetic readings indistinguishable from real ones, on a screen in a
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moving car, is a safety problem. The indication belongs on the display surface
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itself, not in a settings page or a startup log.
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## This app is the audio sink
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The tablet owns the car's aux input and is the music player, so the Orin's speech
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has to arrive here to be heard.
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- TTS arrives as **discrete utterances** over the reliable channel, not as a
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real-time stream. Receive the whole thing, then play it — no jitter buffer.
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- Duck other audio with `AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK` for the duration of
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the utterance, then release. That is what makes Spotify drop under the voice
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without either side coordinating.
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- The microphone stays on the Orin. This app never captures audio; ASR input never
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crosses the boundary.
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