docs: expand mobile app design — hybrid extraction, Karoo integration, platform independence vision
This commit is contained in:
Davide Scaini
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# Bincio Mobile App — Design Document
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# Bincio Mobile App — Design Document
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## Vision
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The long-term goal is full independence from Garmin Connect, Strava, and similar
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platforms. Today those platforms act as mandatory intermediaries: your device
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syncs to their cloud, you authorise third parties to pull from their API, and your
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data effectively lives on their servers.
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The Bincio mobile app removes that dependency:
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- Your FIT/GPX/TCX files live on your device.
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- The app reads them directly — no platform sync required.
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- A Bincio instance (bincio.org or self-hosted) is an optional upgrade for backup,
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sharing, and web access — not a prerequisite.
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- Devices like the **Karoo 2** (Android-based) are a first-class target: activities
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are already saved locally as FIT files, so the app can pick them up directly from
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the filesystem without any export step.
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---
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## Philosophy
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## Philosophy
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The Bincio mobile app follows a **local-first** model:
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**Local-first.** All activity data lives on the device. The app works fully offline
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— no account, no internet connection, no platform authorisation required.
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- All activity data lives on the device. The app works fully offline — no account or internet connection required.
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**Original files as source of truth.** The raw FIT/GPX/TCX file is always stored on
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- An online instance (bincio.org or a self-hosted server) is an optional upgrade, not a prerequisite.
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device alongside the extracted BAS JSON. This means:
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- Activities are stored in the open **BAS format** (the same JSON schema the server uses), so data is always portable and readable without the app.
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- Sync is explicit and user-initiated — the app never silently overwrites local data.
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The goal is a personal activity log that you own. The cloud is a backup and a sharing mechanism, not the source of truth.
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- You can re-extract at any time (e.g. when the algorithm improves, or to apply DEM
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correction after connecting to an instance).
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- Sync to a remote instance is just pushing the original file — the server
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re-extracts with the full Python pipeline.
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- No data is ever locked into a proprietary representation.
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**Sync is optional and explicit.** Connecting to a Bincio instance (bincio.org or
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self-hosted) adds cloud backup, the web feed, and the ability to share activities.
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The app never silently overwrites local data. Sync is user-initiated.
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**Open format.** Activities are stored in the BAS schema (the same JSON format the
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server uses). Any tool — in any language — can read them.
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---
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---
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@@ -20,12 +49,12 @@ Several pieces of the mobile app are already implemented or proven:
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| Piece | Where | Notes |
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| Piece | Where | Notes |
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| BAS schema | `docs/schema.md` | The on-device data format — identical to the server format |
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| BAS schema | `docs/schema.md` | The on-device data format — identical to the server format |
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| In-browser FIT/GPX/TCX parsing | `site/src/pages/convert/` | Pyodide + the Python extractor running in a browser tab. Proves the extraction works without a server. Not suitable for mobile (Pyodide is 30 MB, browser-only). |
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| In-browser FIT/GPX/TCX parsing | `site/src/pages/convert/` | Pyodide + the Python extractor running in a browser tab. Proves local extraction works. Not portable to mobile (Pyodide is 30 MB, browser-only). |
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| Local activity storage | `site/src/pages/convert/` | IndexedDB + service worker serving local activities in the feed. Proves the concept; needs a native equivalent. |
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| Local activity storage | `site/src/pages/convert/` | IndexedDB + service worker in the web app. Proves the concept; the mobile app uses SQLite instead. |
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| Content-addressed dedup | `bincio/extract/dedup.py` | `source_hash` (SHA-256 of raw file) already prevents duplicates on upload |
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| Content-addressed dedup | `bincio/extract/dedup.py` | `source_hash` (SHA-256 of raw file) prevents duplicates on upload |
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| Sync-ready REST API | `bincio/serve/server.py` | Login, upload, activity detail, index.json — the sync primitives are already there |
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| Sync-ready REST API | `bincio/serve/server.py` | Login, upload, activity detail, index.json — the sync primitives are already there |
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| Settings persistence | `bincio/serve/db.py` | `settings` table (key/value) in the multi-user SQLite DB; the mobile_app branch added this |
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| Settings persistence | `bincio/serve/db.py` | `settings` table (key/value) for instance URL, auth token, sync preferences |
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| Elevation algorithms | `bincio/extract/metrics.py`, `bincio/extract/dem.py` | Hysteresis accumulation and DEM correction — need a TypeScript port |
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| Elevation algorithms | `bincio/extract/metrics.py`, `bincio/extract/dem.py` | Hysteresis and DEM correction — need a TypeScript port for offline use |
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---
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---
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@@ -36,33 +65,70 @@ Several pieces of the mobile app are already implemented or proven:
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**Expo** (React Native + the Expo SDK) is the recommended platform:
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**Expo** (React Native + the Expo SDK) is the recommended platform:
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- TypeScript-first, large ecosystem
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- TypeScript-first, large ecosystem
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- `expo-sqlite` (v2+) provides a fast on-device SQLite database with WAL mode — good fit for BAS-style JSON blobs
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- `expo-sqlite` (v2+) — fast on-device SQLite with WAL mode
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- File picking and sharing: `expo-document-picker`, `expo-sharing`
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- File picking from device storage: `expo-document-picker`
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- Maps: MapLibre React Native (`@maplibre/maplibre-react-native`) — same tile standard as the web app, self-hostable
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- Direct filesystem access (important for Karoo): `expo-file-system`
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- Maps: MapLibre React Native (`@maplibre/maplibre-react-native`) — same tile
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standard as the web app, self-hostable
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- Background tasks: `expo-background-fetch` / `expo-task-manager`
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- Background tasks: `expo-background-fetch` / `expo-task-manager`
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- OTA updates via Expo's update service
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- Expo Go for rapid development without a build step
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- Expo Go app for rapid development without a build step
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- EAS Build for iOS and Android distribution
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- Builds for iOS and Android from a single codebase via EAS Build
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**Why not alternatives:**
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**Why not alternatives:**
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| Option | Reason for skipping |
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| Option | Reason for skipping |
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| Capacitor + Svelte | Reuses web components but WebView performance is poor for map-heavy activities; Pyodide can't run on mobile |
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| Capacitor + Svelte | WebView performance is poor for map-heavy activity detail; Pyodide can't run on mobile |
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| Flutter | Dart is unfamiliar, requires rewriting all logic; no advantage over RN for this use case |
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| Flutter | Dart is a new language to learn; no practical advantage over RN for this use case |
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| PWA | iOS severely limits background sync, local storage quotas, and file access — not viable for an activity logger |
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| PWA | iOS limits background sync, local storage quotas, and filesystem access — not viable for an activity logger |
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### Extraction engine: TypeScript port
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---
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The Python extractor (`bincio/extract/`) cannot run on mobile. It must be re-implemented in TypeScript. The math is straightforward:
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## Extraction: hybrid model
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- **FIT parsing**: `@garmin/fitsdk` or `fit-file-parser` (existing JS libraries)
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Python (the server's extraction engine) cannot run on mobile without a specialised
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- **GPX/TCX parsing**: standard XML parsing (`DOMParser` or `fast-xml-parser`)
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runtime. Rather than fully porting the extraction to TypeScript, the app uses a
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- **Metrics**: distance (Haversine), speed, HR/power averages, lap splits — all simple loops
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**tiered extraction model**:
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- **Elevation**: direct port of the hysteresis algorithm from `metrics.py` and `dem.py`
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- **DEM correction**: same HTTP API call to Open-Elevation, works from mobile
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The TypeScript extraction library (`bincio-extract-ts` or similar) should produce BAS-compatible JSON — the same schema that the server writes. This makes the output directly uploadable.
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### Tier 1 — On-device TypeScript extraction (always available, offline)
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A TypeScript extraction library (`bincio-extract-ts`) runs entirely on the device:
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- **FIT parsing**: `@garmin/fitsdk` or `fit-file-parser` (mature JS libraries)
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- **GPX/TCX parsing**: standard XML parsing (`fast-xml-parser`)
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- **Metrics**: distance (Haversine), moving time, speed, HR/power averages, lap splits
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- **Elevation**: direct port of the hysteresis algorithm from `metrics.py`
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This produces a valid BAS JSON that the app can display immediately. It is the
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default path and works with no network.
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### Tier 2 — Server-assisted extraction (when an instance is reachable)
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When a Bincio instance is configured and online, the app can delegate extraction
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to the server:
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1. Send the raw file to `POST /api/extract` (a new stateless endpoint — processes
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the file and returns BAS JSON, does **not** store anything).
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2. The server runs the full Python pipeline: FIT `enhanced_altitude` detection,
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source-aware hysteresis, DEM correction, power metrics, laps.
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3. The app stores the returned BAS JSON locally and marks it as server-extracted.
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This gives full extraction quality without maintaining two implementations of every
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algorithm. The original file is always stored locally, so the app can re-extract
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via the server at any time (e.g. after a DEM correction improvement is deployed).
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### Re-extraction
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Because the original file is always on device, the app can re-run either tier at
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any time:
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- **Re-extract offline**: apply an updated TypeScript algorithm to an existing
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original file.
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- **Re-extract via server**: send the original file to the server for higher-quality
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processing (e.g. after connecting to an instance for the first time).
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This means extraction quality improves automatically as algorithms improve, without
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any data migration.
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---
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---
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@@ -71,103 +137,165 @@ The TypeScript extraction library (`bincio-extract-ts` or similar) should produc
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```
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```
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Bincio Mobile
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Bincio Mobile
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├── UI Layer (React Native / Expo)
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├── UI Layer (React Native / Expo)
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│ ├── Feed screen — list of local activities
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│ ├── Feed screen — list of local activities, sorted by date
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│ ├── Activity detail — map + chart + stats
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│ ├── Activity detail — map + elevation chart + stats
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│ ├── Import screen — pick FIT/GPX/TCX from device or cloud storage
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│ ├── Import screen — pick FIT/GPX/TCX from device or share sheet
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│ ├── Sync screen — configure instance, push/pull
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│ ├── Sync screen — configure instance URL, push/pull
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│ └── Settings screen — instance URL, account, preferences
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│ └── Settings screen — account, preferences, storage info
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│
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│
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├── Extraction Engine (TypeScript)
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├── Extraction Engine (TypeScript — Tier 1)
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│ ├── FIT parser — wraps @garmin/fitsdk
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│ ├── FIT parser — wraps @garmin/fitsdk
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│ ├── GPX parser — XML → BAS points
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│ ├── GPX parser — XML → BAS points
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│ ├── TCX parser — XML → BAS points
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│ ├── TCX parser — XML → BAS points
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│ ├── Metrics — port of metrics.py (distance, elevation, HR, power)
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│ ├── Metrics — port of metrics.py (distance, elevation, HR, power)
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│ └── Hysteresis — port of dem.py _hysteresis_gain_loss + _moving_average
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│ └── Hysteresis — port of _hysteresis_gain_loss + _moving_average
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│
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│
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├── Local Store (expo-sqlite)
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├── Local Store (expo-sqlite)
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│ ├── activities — BAS detail JSON + summary fields as columns
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│ ├── activities — BAS detail JSON + indexed summary columns
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│ ├── timeseries — 1 Hz arrays stored as JSON blobs per activity
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│ ├── timeseries — 1 Hz arrays as JSON blob per activity
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│ ├── geojson — simplified GPS track per activity
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│ ├── geojson — simplified GPS track per activity
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│ └── settings — instance_url, auth_token, sync preferences
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│ ├── originals — original file paths (or blobs) per activity
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│ └── settings — instance_url, handle, auth_token, sync prefs
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│
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│
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└── Sync Layer
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└── Sync Layer
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├── Auth — POST /api/auth/login → session cookie or token
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├── Auth — POST /api/auth/login → session token
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├── Manifest fetch — GET /{handle}/index.json → list of remote IDs
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├── Extract (Tier 2) — POST /api/extract → BAS JSON, no server storage
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├── Push — POST /api/upload (multipart, original file)
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├── Push — POST /api/upload (original file)
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└── Pull — GET /api/activity/{id} + timeseries + geojson
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└── Pull — GET index.json + activity/{id}.json + timeseries
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```
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```
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---
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---
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## Data model on device
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## Data model on device
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Each activity is stored in SQLite with:
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```sql
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-- activities table
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id TEXT PRIMARY KEY, -- BAS ID: "2026-04-17T074238Z"
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source_hash TEXT NOT NULL, -- SHA-256 of original file (dedup key)
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detail_json TEXT NOT NULL, -- full BAS detail JSON blob
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timeseries_json TEXT, -- 1 Hz arrays (loaded lazily)
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geojson TEXT, -- simplified GPS track
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original_path TEXT, -- path to original file in app storage
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extraction_tier INTEGER, -- 1 = TypeScript, 2 = server-extracted
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synced_at INTEGER, -- unix timestamp of last push to remote (NULL = unsynced)
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origin TEXT NOT NULL, -- "local" | "remote"
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created_at INTEGER NOT NULL
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- `id` — BAS activity ID (`2026-04-17T074238Z`)
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-- settings table
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- `source_hash` — SHA-256 of the original file (deduplication key)
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key TEXT PRIMARY KEY,
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- `detail_json` — full BAS detail JSON blob
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value TEXT NOT NULL
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- `timeseries_json` — 1 Hz arrays blob (nullable — loaded lazily)
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```
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- `geojson` — simplified GPS track (nullable)
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- `synced_at` — timestamp of last successful push to remote instance (nullable = not yet synced)
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- `origin` — `"local"` (parsed on device) | `"remote"` (pulled from instance)
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The `settings` table stores:
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**Settings keys:**
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| Key | Example value |
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| `instance_url` | `https://bincio.org` |
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| `instance_url` | `https://bincio.org` |
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| `handle` | user's handle on the remote instance |
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| `handle` | `brutsalvadi` |
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| `session_token` | auth cookie/token value |
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| `session_token` | `abc123…` |
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| `last_sync_at` | ISO timestamp of last sync |
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| `last_sync_at` | `2026-04-24T10:00:00Z` |
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| `auto_import_path` | `/sdcard/Karoo/Rides/` (Android only) |
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---
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## Karoo and Android-first devices
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Devices like the **Karoo 2** run Android and write FIT files directly to the
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filesystem (e.g. `/sdcard/Karoo/Rides/`). The app can monitor this directory and
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auto-import new files as rides complete, with no manual export step and no Hammerhead
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(or Garmin, Wahoo, etc.) cloud sync required.
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On Karoo specifically:
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- Install the Bincio Android APK directly.
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- Configure `auto_import_path` to point at the Karoo's ride directory.
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- When a new FIT file appears, the app imports it automatically (Tier 1 extraction),
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stores the original file, and shows the ride in the feed.
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- When WiFi is available and an instance is configured, rides can be pushed to the
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instance (Tier 2 extraction for higher quality, or just raw upload).
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This makes Bincio a complete replacement for Hammerhead's own sync infrastructure
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for users who want full control of their data.
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---
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---
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## Sync protocol
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## Sync protocol
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Sync is a two-way, hash-based diff — no custom server protocol needed:
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Sync is a two-way, hash-based diff — no custom server protocol needed beyond
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the existing REST API.
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### Push (local → server)
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### Push (local → server)
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1. Fetch `{instance_url}/{handle}/index.json` to get remote activity IDs.
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1. Fetch `{instance_url}/{handle}/index.json` to get remote activity IDs.
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2. Find activities where `synced_at IS NULL` or `origin = "local"` and `id NOT IN remote_ids`.
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2. Find local activities where `synced_at IS NULL`.
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3. For each unsynced activity, `POST /api/upload` with the original file (stored separately from the extracted JSON) or reconstruct a minimal file from the BAS JSON.
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3. For each unsynced activity, `POST /api/upload` with the original file.
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4. On 200, set `synced_at = now()`.
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4. On 200, set `synced_at = now()`.
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### Pull (server → local)
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### Pull (server → local)
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1. Fetch `{instance_url}/{handle}/index.json` (and yearly shards if present).
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1. Fetch `{instance_url}/{handle}/index.json` (and yearly shards).
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2. Find IDs in the remote list that are not in the local DB.
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2. Find remote IDs not in the local DB.
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3. For each missing activity:
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3. For each missing activity:
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- `GET {instance_url}/activities/{id}.json` → store as `detail_json`
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- `GET {instance_url}/activities/{id}.json` → `detail_json`
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- `GET {instance_url}/activities/{id}.timeseries.json` → store as `timeseries_json` (lazy, on demand)
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- `GET {instance_url}/activities/{id}.timeseries.json` → `timeseries_json`
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- `GET {instance_url}/activities/{id}.geojson` → store as `geojson`
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- `GET {instance_url}/activities/{id}.geojson` → `geojson`
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4. Insert with `origin = "remote"`, `synced_at = now()`.
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4. Insert with `origin = "remote"`, `synced_at = now()`.
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### Conflict handling
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### Conflict handling
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Activities are immutable once created (same philosophy as the server). Conflicts only arise if the same source file is imported on two devices before sync. The `source_hash` prevents double-counting — whichever copy arrives at the server first wins; the duplicate is rejected silently.
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Activities are immutable once created. The `source_hash` prevents double-counting —
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if the same file is imported on two devices before sync, whichever copy arrives at
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the server first wins; the duplicate is rejected with a 409.
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---
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---
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## What's NOT in scope (v1)
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## New server endpoint needed: `POST /api/extract`
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- Live activity recording (GPS track + sensor recording during a ride) — this is a separate, harder problem
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A stateless extraction endpoint: accepts a raw FIT/GPX/TCX file, runs the full
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- Offline map tiles — initial version requires network for map rendering
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Python extraction pipeline, returns BAS JSON. Does not write anything to disk.
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- Photo sync — photos are not included in the BAS timeseries, sync deferred
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- Watch / ANT+ / Bluetooth sensors — out of scope for v1
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```
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- Editing activities on mobile — read-only feed in v1; edits happen on the web
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POST /api/extract
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||||||
|
Content-Type: multipart/form-data
|
||||||
|
file: <raw activity file>
|
||||||
|
|
||||||
|
200 OK
|
||||||
|
{
|
||||||
|
"detail": { ...BAS detail JSON... },
|
||||||
|
"timeseries": { ...1 Hz arrays... },
|
||||||
|
"geojson": { ...simplified track... }
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
No authentication required (the server is just a compute service here — the result
|
||||||
|
is not stored). Rate limiting and file size cap apply.
|
||||||
|
|
||||||
---
|
---
|
||||||
|
|
||||||
## Open questions
|
## Authentication
|
||||||
|
|
||||||
1. **Original file storage**: To push to the server, we need the original FIT/GPX/TCX file. Do we always keep it, or reconstruct a minimal file from extracted BAS JSON? The `POST /api/import-bas` endpoint already exists on the edit server for this use case (see `convert/` page).
|
The multi-user server currently uses HTTP session cookies. For the mobile client,
|
||||||
|
a **Bearer token** is cleaner:
|
||||||
|
|
||||||
2. **Auth model**: The multi-user server uses HTTP session cookies. React Native handles cookies but a token-based auth (`Authorization: Bearer …`) would be cleaner for a mobile client. A `POST /api/auth/token` endpoint may be worth adding.
|
```
|
||||||
|
POST /api/auth/token
|
||||||
|
{ "handle": "…", "password": "…" }
|
||||||
|
→ { "token": "abc123…", "expires_at": "…" }
|
||||||
|
```
|
||||||
|
|
||||||
3. **iOS file access**: FIT/GPX files from Garmin Connect, Komoot, etc. arrive via the share sheet or Files app. `expo-document-picker` handles this but needs testing with each source.
|
The token is stored in the `settings` table and sent as
|
||||||
|
`Authorization: Bearer abc123…` on all subsequent requests.
|
||||||
|
|
||||||
4. **Offline DEM**: DEM correction requires a network call. On mobile, the hysteresis method (offline) should be the default; DEM correction is opt-in when connected.
|
---
|
||||||
|
|
||||||
|
## What is out of scope for v1
|
||||||
|
|
||||||
|
- **Live activity recording** — GPS + sensor recording during a ride. This is a
|
||||||
|
much harder problem (background GPS, Bluetooth/ANT+ sensors, real-time display)
|
||||||
|
and is the eventual goal for full platform independence.
|
||||||
|
- **Offline map tiles** — v1 requires network for map rendering.
|
||||||
|
- **Photo sync** — deferred.
|
||||||
|
- **Watch / ANT+ / Bluetooth sensors** — deferred.
|
||||||
|
- **Editing activities on mobile** — read-only in v1; edits happen on the web.
|
||||||
|
|
||||||
---
|
---
|
||||||
|
|
||||||
@@ -175,7 +303,9 @@ Activities are immutable once created (same philosophy as the server). Conflicts
|
|||||||
|
|
||||||
| Phase | Scope |
|
| Phase | Scope |
|
||||||
|---|---|
|
|---|---|
|
||||||
| **0 — Foundation** | Expo project scaffold, local SQLite store, settings screen, BAS reader (load an existing `.json` file into the feed) |
|
| **0 — Foundation** | Expo project scaffold, SQLite store, settings screen, file picker, display a BAS JSON read from disk |
|
||||||
| **1 — Import** | TypeScript FIT/GPX/TCX parser + metrics engine, local feed, activity detail with map and chart |
|
| **1 — Import** | TypeScript FIT/GPX/TCX parser + metrics engine (Tier 1), local feed, activity detail with map and chart, original file storage |
|
||||||
| **2 — Sync** | Auth, push/pull sync with bincio.org or a self-hosted instance |
|
| **2 — Karoo integration** | Auto-import from a watched directory, Android-specific file access |
|
||||||
| **3 — Polish** | Offline map tiles, share sheet integration, widgets, performance |
|
| **3 — Sync** | `POST /api/extract` endpoint, Bearer token auth, push/pull sync with an instance |
|
||||||
|
| **4 — Polish** | Offline map tiles, share sheet, home screen widget, performance |
|
||||||
|
| **Future** | Live recording, Bluetooth sensors, full Garmin/Wahoo replacement |
|
||||||
|
|||||||
Reference in New Issue
Block a user