fix: restore CLAUDE.md and protect it from expo prebuild --clean
prebuild --clean overwrote CLAUDE.md with an Expo-generated stub. Restored the original project plan and added ignorePaths in app.json so Expo skips CLAUDE.md on future prebuild runs.
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Davide Scaini
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@AGENTS.md
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# bincio-rec
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GPS activity recorder for the bincio ecosystem.
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Companion to **bincio-autarchive** (archive/sync app): rec makes the data, autarchive stores and syncs it.
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---
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## Concept
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A focused, minimal recording app for cycling, running, hiking, and walking.
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Records GPS track + BLE sensor data, saves to GPX, optionally uploads directly to a bincio-activity server.
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Future: live navigation / turn-by-turn instructions.
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The app does one thing well: **record**. No browsing, no analysis — that's autarchive's job.
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---
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## Ecosystem
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```
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bincio-rec → writes GPX files to shared storage
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bincio-autarchive → imports GPX, stores locally, syncs to server
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bincio-activity → server: parses GPX, stores activities, serves API
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bincio-auth → auth service: issues JWTs for all bincio apps
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```
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bincio-rec can also upload directly to bincio-activity via `/api/upload/raw` (same endpoint autarchive uses), with instance URL + API token configured in settings.
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---
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## Tech Stack
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**Expo Prebuild** (not managed Expo, not bare RN).
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- Managed Expo ruled out: BLE requires native modules
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- Bare RN ruled out: Expo library ecosystem is valuable (location, notifications, file system)
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- Prebuild gives full native access while keeping Expo tooling and EAS Build
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Key libraries:
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- `expo-location` + `expo-task-manager` — background GPS recording
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- `react-native-ble-plx` — BLE sensors (HR, power, cadence)
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- `@maplibre/maplibre-react-native` — live track map, future navigation
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- `expo-notifications` — km milestone alerts, future navigation cues
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- `expo-keep-awake` — keep screen on during recording (user-toggleable)
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- `expo-file-system` — write GPX/JSON to shared storage
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- `expo-sqlite` — local DB for past recordings list
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Target: **Android first**, iOS second.
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---
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## v1 Screens
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1. **Sensor pairing** — scan BLE, pair HR monitor / power meter / cadence sensor; persisted
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2. **Recording** — start / pause / resume / stop
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- Live stats: elapsed time, distance, current+avg speed, HR, power, cadence, elevation gain
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- Map with track drawn in real time
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- Keep-awake toggle
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3. **Post-recording summary** — stats overview, title field, save / discard
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4. **Saved recordings** — list of past sessions; tap to export GPX or upload to server
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5. **Settings** — bincio instance URL + API token; km notification toggle; upload format
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---
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## Output Format
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**GPX with Garmin trackpoint extensions** — one `<trkpt>` per second with:
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- lat/lon/elevation from GPS
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- `<gpxtpx:hr>` — heart rate
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- `<gpxtpx:power>` — power (watts)
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- `<gpxtpx:cad>` — cadence (rpm)
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bincio-activity already parses this format via `bincio.extract.parsers`.
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Files saved to a user-accessible location (iOS Files app / Android shared storage) so bincio-autarchive can import them manually.
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---
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## Known Platform Concerns
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- **Android battery optimization**: aggressive OEMs (Xiaomi, Samsung, Huawei) kill background tasks. Prompt user to whitelist bincio-rec in battery settings on first launch. Every recording app has this problem — no framework-level fix.
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- **iOS background location**: requires `location` background mode in `Info.plist` and "Always" location permission. Fine for sideloading/TestFlight; App Store submission requires clear justification.
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- **iOS foreground notifications**: notification sounds are suppressed when app is in foreground — use `expo-av` audio cue instead for km alerts while screen is on.
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---
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## Out of Scope (v1)
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- Navigation / turn-by-turn routing
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- Auto-pause (stop lights, etc.)
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- Structured workouts / intervals
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- Offline maps
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- Live tracking / sharing
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