mg4/SPECS.md

SPECS — Nils' MG4

Journal for this fork of fatihdonmezdev/FatihsMG4: what has been changed, and what is still to do.

• Our repository: https://git.stinnesbeck.com/nils/mg4
• Upstream: https://github.com/fatihdonmezdev/FatihsMG4 (itself a fork of malys / EVABRPUploader and Leon Kernan / ABRP_Uploader). Credited in the app's About dialog.

Plan: car server at car.stinnesbeck.com

The car sends everything to our own server. The server stores it and forwards live telemetry to ABRP, so the ABRP token lives only on the server, never in the APK.

car ──live telemetry───▶ car.stinnesbeck.com ──▶ ABRP  api.iternio.com/1/tlm/send
    ──daily totals─────▶          │
    ──charging sessions▶          ▼
                              InfluxDB 2

Server — extend web/ (Next.js)

• Storage: MongoDB → InfluxDB 2. Rewrite web/src/lib/mongo.ts / data.ts against one bucket (tag installationId on every point):

  Measurement	Timestamp	Tags	Fields
  telemetry	sample time	—	soc, power, speed, lat, lon, heading, elevation, is_charging, is_dcfc, is_parked, capacity, soe, odometer, est_battery_range, batt_temp, cabin_temp, ext_temp, hvac_setpoint, voltage, current, tire_pressure_fl/fr/rl/rr
  consumption_chunk	recordedAt	date	km, kwh, hours, socDrop, sohPercent (days summed on read)
  charging_session	startedAt	sessionId	endedAt, durationSeconds, energyKwh, gridEnergyKwh, pricePerKwh, totalCost, start/endSocPercent
  charging_curve	point time	sessionId	powerKw, socPercent

  Same measurement + tags + timestamp overwrites, so the car's retries stay idempotent (MongoDB used unique indexes for that).

• New endpoint POST /v1/telemetry: a batch of live samples, ingest-token auth, validated and bounded like the existing endpoints.

• ABRP forwarder: after storing, forward the newest sample to tlm/send with ABRP_API_KEY and ABRP_USER_TOKEN from the environment. Rate-limited; a failed forward is logged but not retried, since stale live data is useless to ABRP. Off when the token is unset.

• Existing endpoints stay: PUT /v1/consumption/daily, PUT /v1/charging-sessions/:id, GET /v1/consumption/history/:id, the dashboard and /v1/health.

• Self-hosting: output: "standalone", a Dockerfile, and InfluxDB's own overwrite semantics instead of ensureIndexes().

Car app

• Restore the live telemetry payload and upload cadence from before ea8032a (TelemetryPayload, UploadCadence, location access), sending to the server instead of ABRP.
• Server URL, ingest token and installation id are entered in a new Server tab or imported from a config file; nothing about the server is compiled into the APK. Each installation generates its own id.

Image and deployment

• Image: git.stinnesbeck.com/nils/mg4-server:<version>, pushed to the forge's registry (needs a registry login on the build machine).
• k8s/ with plain manifests: Namespace, InfluxDB StatefulSet + PVC + Service (cluster-internal), server Deployment + Service + Ingress for car.stinnesbeck.com (TLS), and Secret templates with placeholder values only.
• Nothing is ever applied to the cluster by us. Nils applies the manifests.

Decisions (2026-10-17)

• InfluxDB 2 runs in the cluster from our manifests.
• TLS: cert-manager ClusterIssuer letsencrypt-prod; Traefik IngressRoute on websecure.
• Car config is entered in the app (Server tab / config file), not baked into the APK.
• The ABRP API key and user token are set by Nils in the mg4-server Secret.

Status

• Server on InfluxDB 2 with /v1/telemetry and the ABRP forwarder (web/), tested locally against InfluxDB 2.7.12. Image builds.
• Manifests in k8s/, validated offline. Not applied — that is Nils' step (k8s/README.md).
• Car app 2.3.0: Server tab with config import, live telemetry upload, cadence controls. Unit tests and lint pass; not yet tried on the car.
• Push the image (mg4-server:1.1.1) to git.stinnesbeck.com (needs a registry login on the build machine).
• Check the Traefik ingress class in k8s/ingress.yaml (placeholder traefik-external).
• First drive with 2.3.0: telemetry arrives in InfluxDB and at ABRP.

To do

• About dialog link and QR code → https://git.stinnesbeck.com/nils/mg4. Both come from REPOSITORY_URL in app/src/main/java/com/evsuite/abrp/MainActivity.java and about_repository in app/src/main/res/values/strings.xml. They still point to Fatih's GitHub repository.
• Re-enable OTA updates against our own releases. RELEASES_API in app/src/unstable/java/com/evsuite/abrp/OtaUpdater.java points at updates.invalid on purpose, so checks fail. The updater speaks the GitHub releases API and only allows GitHub hosts (ALLOWED_HOSTS). For git.stinnesbeck.com it needs the host on the allowlist, and the response parsing checked against that server's releases API. Release assets must be named NilsMG4-unstable-<version>.apk with a .sha256 sidecar (build-car writes both).
• Charging currency. Prices and costs are shown in Turkish lira (₺/kWh, ₺) in pane_charging.xml and MainActivity.java.
• Dashboard language. The web/ pages are still Turkish and show prices in lira.
• Telemetry queue survives restarts. Unsent live samples are kept in memory only.
• Translate the rest. The docs (CHANGELOG.md, OTA.md's message table, comments in mise.toml/app/build.gradle) are still Turkish or French.
• Docs still use the old package ID. README.md, OTA.md, CHANGELOG.md, mise.toml and docs/MG4_PLATFORM_INSTALL.md refer to com.evsuite.abrp(.unstable) and FatihsMG4-*.apk.
• Move hardcoded UI strings into strings.xml. Many are inline in Java and layouts.

Done

• 2026-10-17 — Translated the app UI from Turkish to English.
• 2026-10-17 — Nix flake: nix develop provides JDK 21 and the Android SDK. build-car builds the unstable APK and signs it with the AOSP test platform key, which the MG4 head unit uses (cert SHA-256 c8a2e9bc…192ab8).
• 2026-10-17 — OTA update checks disabled by pointing at an unresolvable host (see To do).
• 2026-10-17 — Renamed to "Nils' MG4": package ID com.stinnesbeck.nilsmg4 (.unstable for the car build), APK names NilsMG4-*.apk. It installs next to the old FatihsMG4 app instead of replacing it, and starts with empty settings and history.
• 2026-10-17 — Server rewritten for InfluxDB 2 with live telemetry and ABRP forwarding; Dockerfile; Kubernetes manifests (not applied).
• 2026-10-17 — App 2.3.0: Server tab (URL, ingest token, installation id, config import), live telemetry restored from before ea8032a and sent to the server, Upload-tab cadence controls reconnected, dead switches removed. The removed ABRP classes' unit tests compile and pass again (AbrpApi and HeadUnitWeather tests deleted with their classes).
• 2026-10-17 — Temporary on-screen diagnostics (b2a5b32) to debug blank values without adb; removed again (1002962) once values showed on the car. Revert 1002962 to bring them back.

Installing on the car

nix develop
build-car
adb push build/car/NilsMG4-unstable-<version>.apk /data/local/tmp/update.apk
adb shell "pm install -r -f -d -t /data/local/tmp/update.apk"

To remove the old upstream app: adb uninstall com.evsuite.abrp.unstable.