From 6145736c9766f8ef4d269fa113421bca1333c43e Mon Sep 17 00:00:00 2001
From: Nils Stinnesbeck <git@stinnesbeck.com>
Date: Sat, 17 Oct 2026 14:23:04 +0200
Subject: [PATCH] App 2.3.0: Server tab, live telemetry to the car server

- New Server tab: server URL, ingest token and installation id, with
  Save, Test connection (health, then a read-only token check) and the
  config-file import that upstream removed (app folder / USB stick first,
  document picker as fallback). Settings are kept encrypted and read on
  every use, so the service picks up a change without a restart. Each
  installation generates its own id; the inherited upstream UUID and
  the baked-in CONSUMPTION_API_* build fields are gone.
- Live telemetry restored from before ea8032a (TelemetryPayload,
  UploadCadence, UploadSettings, GPS) and sent in batches to
  POST /v1/telemetry instead of ABRP; the server forwards to ABRP. Adds
  ext_temp, voltage and current. Unsent samples queue in memory (about
  8 h) while offline.
- Upload tab: the live-telemetry switch and cadence controls work again;
  the dead service and autostart switches are removed.
- Manifest: location permissions and foreground service types.
- Unit tests compile again: 114 (stable) / 136 (unstable) pass. Tests
  for the deleted AbrpApi and HeadUnitWeather removed; new tests for
  ServerConfig and TelemetryQueue. Lint passes.

Not yet tried on the car.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 SPECS.md                                      |  56 +--
 app/build.gradle                              |  14 +-
 app/src/main/AndroidManifest.xml              |   8 +-
 .../com/evsuite/abrp/AbrpUploadService.java   |  31 +-
 .../java/com/evsuite/abrp/ConfigImport.java   | 127 ++++++
 .../evsuite/abrp/ConsumptionCloudClient.java  |  45 +--
 .../java/com/evsuite/abrp/MainActivity.java   | 379 +++++++++++++++++-
 .../java/com/evsuite/abrp/SecurePrefs.java    |  48 +++
 .../java/com/evsuite/abrp/ServerConfig.java   | 100 +++++
 .../com/evsuite/abrp/TelemetryPayload.java    | 213 ++++++++++
 .../java/com/evsuite/abrp/TelemetryQueue.java |  59 +++
 .../com/evsuite/abrp/TelemetryUploader.java   | 264 ++++++++++++
 .../java/com/evsuite/abrp/UploadCadence.java  |  66 +++
 .../java/com/evsuite/abrp/UploadSettings.java |  77 +++-
 app/src/main/res/drawable/ic_tab_server.xml   |  23 ++
 .../main/res/layout-w1000dp/activity_main.xml |   1 +
 .../main/res/layout-w1000dp/pane_service.xml  |   5 +-
 app/src/main/res/layout/activity_main.xml     |   1 +
 app/src/main/res/layout/pane_server.xml       |  30 ++
 app/src/main/res/layout/pane_service.xml      |   5 +-
 app/src/main/res/values/strings.xml           |  48 +--
 app/src/main/res/values/strings_design.xml    |   8 +-
 .../java/com/evsuite/abrp/AbrpApiTest.java    |  50 ---
 .../com/evsuite/abrp/ConfigImportTest.java    |  23 +-
 .../com/evsuite/abrp/HeadUnitWeatherTest.java | 109 -----
 .../com/evsuite/abrp/ServerConfigTest.java    |  47 +++
 .../com/evsuite/abrp/TelemetryQueueTest.java  |  40 ++
 27 files changed, 1590 insertions(+), 287 deletions(-)
 create mode 100644 app/src/main/java/com/evsuite/abrp/ConfigImport.java
 create mode 100644 app/src/main/java/com/evsuite/abrp/SecurePrefs.java
 create mode 100644 app/src/main/java/com/evsuite/abrp/ServerConfig.java
 create mode 100644 app/src/main/java/com/evsuite/abrp/TelemetryPayload.java
 create mode 100644 app/src/main/java/com/evsuite/abrp/TelemetryQueue.java
 create mode 100644 app/src/main/java/com/evsuite/abrp/TelemetryUploader.java
 create mode 100644 app/src/main/java/com/evsuite/abrp/UploadCadence.java
 create mode 100644 app/src/main/res/drawable/ic_tab_server.xml
 create mode 100644 app/src/main/res/layout/pane_server.xml
 delete mode 100644 app/src/test/java/com/evsuite/abrp/AbrpApiTest.java
 delete mode 100644 app/src/test/java/com/evsuite/abrp/HeadUnitWeatherTest.java
 create mode 100644 app/src/test/java/com/evsuite/abrp/ServerConfigTest.java
 create mode 100644 app/src/test/java/com/evsuite/abrp/TelemetryQueueTest.java

diff --git a/SPECS.md b/SPECS.md
index a315240..3991e21 100644
--- a/SPECS.md
+++ b/SPECS.md
@@ -27,7 +27,7 @@ car ──live telemetry───▶ car.stinnesbeck.com ──▶ ABRP  api.ite
   | 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_daily` | the day, 00:00 UTC | — | km, kwh, hours, socDrop, sohPercent |
+  | `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 |
 
@@ -40,15 +40,16 @@ car ──live telemetry───▶ car.stinnesbeck.com ──▶ ABRP  api.ite
   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:** drop the Vercel assumptions, `output: "standalone"`, a `Dockerfile`, and
-  `ensureIndexes()` replaced by bucket checks at startup.
+- **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 and ingest token: open question, see below.
-- Generate our own `CONSUMPTION_INSTALLATION_ID`.
+- 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
 
@@ -59,15 +60,23 @@ car ──live telemetry───▶ car.stinnesbeck.com ──▶ ABRP  api.ite
   with placeholder values only.
 - **Nothing is ever applied to the cluster by us.** Nils applies the manifests.
 
-### Open questions
+### Decisions (2026-10-17)
 
-- [ ] Run InfluxDB inside the cluster from our manifests (assumed), or use an existing instance?
-- [ ] Ingress class and TLS setup (e.g. cert-manager `ClusterIssuer` name), or an existing wildcard
-      certificate Secret?
-- [ ] Car config: bake the server URL and ingest token into the APK at build time (as upstream
-      does), or enter them in the app, which restores the settings tab with the config-file import?
-      In the app keeps the token out of the APK.
-- [ ] ABRP API key: the open-source default key from upstream, or our own?
+- 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
+
+- [x] Server on InfluxDB 2 with `/v1/telemetry` and the ABRP forwarder (`web/`), tested locally
+      against InfluxDB 2.7.12. Image builds.
+- [x] Manifests in `k8s/`, validated offline. **Not applied** — that is Nils' step (`k8s/README.md`).
+- [x] 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 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
 
@@ -81,19 +90,12 @@ car ──live telemetry───▶ car.stinnesbeck.com ──▶ ABRP  api.ite
       (`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).
-- [ ] **ABRP upload is gone upstream.** Upstream commit `ea8032a` ("chore", 2026-10-09) removed the
-      ABRP tab, the config-file import (`ConfigImport`), the upload (`AbrpApi`, `TelemetryPayload`,
-      `UploadCadence`), `SecurePrefs` and `HeadUnitWeather`. The app now only tracks consumption
-      and syncs it to the MongoDB API. Leftover `strings.xml` entries (`btn_import`, `import_*`,
-      `hint_api_key`, …) belong to it. Decide whether to restore it.
-- [ ] **Fix the unit tests.** They don't compile upstream: `AbrpApiTest`, `TelemetryPayloadTest`
-      and others still use `AbrpApi`/`TelemetryPayload`, which upstream commit `ea8032a` deleted.
 - [ ] **Charging currency.** Prices and costs are shown in Turkish lira (`₺/kWh`, `₺`) in
       `pane_charging.xml` and `MainActivity.java`.
-- [ ] **Cloud consumption sync.** `CONSUMPTION_INSTALLATION_ID` in `app/build.gradle` is a fixed
-      UUID inherited from upstream. Set our own before configuring `CONSUMPTION_API_URL` /
-      `CONSUMPTION_API_TOKEN`, so our data cannot land under upstream's id.
-- [ ] **Translate the rest.** The `web/` dashboard (Next.js) and docs (`CHANGELOG.md`, `OTA.md`'s
+- [ ] **Dashboard language and branding.** The `web/` pages are still Turkish, say "FatihsMG4" 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`.
@@ -109,6 +111,12 @@ car ──live telemetry───▶ car.stinnesbeck.com ──▶ ABRP  api.ite
 - 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.
 
diff --git a/app/build.gradle b/app/build.gradle
index a82f37f..0c0fc65 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -34,17 +34,11 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 56
-        versionName "2.2.39"
+        versionCode 57
+        versionName "2.3.0"
 
-        // MongoDB credentials never ship in the APK. The app only talks to the small
-        // authenticated API in server/, which owns the database connection.
-        buildConfigField "String", "CONSUMPTION_API_URL", "\"${System.getenv('CONSUMPTION_API_URL') ?: ''}\""
-        buildConfigField "String", "CONSUMPTION_API_TOKEN", "\"${System.getenv('CONSUMPTION_API_TOKEN') ?: ''}\""
-        // Fixed installation identity: baked into every build so an APK wipe cannot orphan
-        // the cloud history under a new random UUID. The car's own consumption history lives
-        // under this id in the daily_consumption collection.
-        buildConfigField "String", "CONSUMPTION_INSTALLATION_ID", "\"226b1614-4d18-48f0-8938-3609cfa3db93\""
+        // Nothing about the server ships in the APK: its URL and ingest token are entered in
+        // the app's Server tab (ServerConfig), and the database is only reachable by the server.
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 608eaba..36b8413 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -8,6 +8,11 @@
     <!-- Required from API 33 to post the foreground-service notification, which is the
          only status UI the service has. Without it the notification is silently dropped. -->
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <!-- GPS for the position in live telemetry. -->
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_LOCATION" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
 
     <!-- Wi-Fi auto-join. CHANGE_WIFI_STATE covers enabling the radio and asking the
          supplicant to join a network the unit already has saved; ACCESS_WIFI_STATE covers
@@ -52,7 +57,8 @@
 
         <service
             android:name=".AbrpUploadService"
-            android:exported="false" />
+            android:exported="false"
+            android:foregroundServiceType="dataSync|location" />
 
         <!-- The head unit resumes far more often than it cold-boots, and announces the
              resume with QUICKBOOT_POWERON. Listening only for BOOT_COMPLETED is why
diff --git a/app/src/main/java/com/evsuite/abrp/AbrpUploadService.java b/app/src/main/java/com/evsuite/abrp/AbrpUploadService.java
index b4aa351..74e1a33 100644
--- a/app/src/main/java/com/evsuite/abrp/AbrpUploadService.java
+++ b/app/src/main/java/com/evsuite/abrp/AbrpUploadService.java
@@ -24,11 +24,13 @@ import java.util.concurrent.TimeUnit;
 
 /**
  * Foreground service that polls vehicle telemetry every 15 s, integrates consumption locally,
- * and syncs it to the cloud (MongoDB) in 30-minute delta chunks. Never sends anything to ABRP.
+ * syncs it to the car server in 2-minute delta chunks, and sends live telemetry samples that
+ * the server stores and forwards to ABRP ({@link TelemetryUploader}). The car itself never
+ * talks to ABRP and holds no ABRP credentials.
  *
  * Always-on by design: started at boot (BootReceiver) and on app open, never gated on
- * credentials or a toggle. The only thing it needs is a network for the cloud sync, and a
- * missing one is handled by caching chunks locally until the connection returns.
+ * credentials or a toggle. The only thing it needs is a network, and a missing one is
+ * handled by queueing locally until the connection returns.
  */
 public class AbrpUploadService extends Service {
 
@@ -64,6 +66,7 @@ public class AbrpUploadService extends Service {
     private ConsumptionTracker consumptionTracker;
     private ConsumptionCloudClient consumptionCloudClient;
     private ChargeSessionTracker chargeSessionTracker;
+    private TelemetryUploader telemetryUploader;
     private WifiAutoConnect wifi;
     private ScheduledExecutorService scheduler;
     private SharedPreferences prefs;
@@ -94,6 +97,7 @@ public class AbrpUploadService extends Service {
         consumptionCloudClient = new ConsumptionCloudClient(getApplicationContext());
         chargeSessionTracker = ChargeSessionTracker.get(getApplicationContext());
         wifi = new WifiAutoConnect(getApplicationContext());
+        telemetryUploader = new TelemetryUploader(getApplicationContext());
 
         scheduler.scheduleWithFixedDelay(
                 this::safeUploadCycle,
@@ -111,15 +115,16 @@ public class AbrpUploadService extends Service {
     }
 
     /**
-     * Enters the foreground. No location type — this service no longer reads GPS. Foreground
-     * service types do not exist before API 29, so on this API-28 head unit a plain
-     * startForeground is the only correct call.
+     * Enters the foreground. Foreground service types do not exist before API 29, so on this
+     * API-28 head unit a plain startForeground is the only correct call; from API 29 the
+     * location type is what lets the GPS subscription run in the background.
      */
     private void startInForeground() {
         Notification notification = buildNotification(lastStatus);
         if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
             ServiceCompat.startForeground(
-                    this, NOTIF_ID, notification, ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC);
+                    this, NOTIF_ID, notification,
+                    ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC | ServiceInfo.FOREGROUND_SERVICE_TYPE_LOCATION);
         } else {
             startForeground(NOTIF_ID, notification);
         }
@@ -133,6 +138,7 @@ public class AbrpUploadService extends Service {
         running = false;
         prefs.edit().putBoolean("service_running", false).apply();
         if (scheduler != null) scheduler.shutdownNow();
+        if (telemetryUploader != null) telemetryUploader.stop();
         Log.i(TAG, "Service stopped");
     }
 
@@ -159,7 +165,16 @@ public class AbrpUploadService extends Service {
             wifi.ensureConnected(false);
         }
 
-        updateNotification("Consumption tracking active");
+        UploadSettings settings = UploadSettings.from(prefs);
+        if (!ServerConfig.get(this).isConfigured()) {
+            updateNotification(getString(R.string.server_not_configured));
+        } else if (!settings.abrpUploadEnabled) {
+            updateNotification(getString(R.string.notif_tracking_locally));
+        } else {
+            telemetryUploader.tick(vehicle, chargeSessionTracker.snapshot(), settings);
+            int queued = telemetryUploader.queued();
+            updateNotification(queued > 0 ? "Sending telemetry — " + queued + " queued" : "Sending telemetry");
+        }
     }
 
     // ---------- Notification ----------
diff --git a/app/src/main/java/com/evsuite/abrp/ConfigImport.java b/app/src/main/java/com/evsuite/abrp/ConfigImport.java
new file mode 100644
index 0000000..0495edd
--- /dev/null
+++ b/app/src/main/java/com/evsuite/abrp/ConfigImport.java
@@ -0,0 +1,127 @@
+package com.evsuite.abrp;
+
+/**
+ * Parses a configuration text file so the app can be set up without typing on the car's
+ * on-screen keyboard — the ingest token in particular is long and error-prone to enter by
+ * hand. The file is a plain {@code key = value} list, one entry per line:
+ *
+ * <pre>
+ *   # Nils' MG4 config
+ *   server_url      = https://car.stinnesbeck.com
+ *   token           = 0123abcd...            (the server's INGEST_TOKEN)
+ *   installation_id = 6f1a2b3c-4d5e-4f60-8a9b-0c1d2e3f4a5b
+ *   interval_sec    = 60
+ *   boost_low_soc   = true
+ *   low_soc_percent = 20
+ * </pre>
+ *
+ * Usually only server_url and token are needed. installation_id is for a reinstall: it puts
+ * the car back under the id its history is stored with. The cadence keys are optional. Blank lines and
+ * lines starting with {@code #} are ignored, keys are case-insensitive, and surrounding
+ * whitespace is trimmed. Every field is nullable: the caller applies only what the file set,
+ * leaving anything absent untouched.
+ */
+final class ConfigImport {
+
+    final String serverUrl;
+    final String token;
+    final String installationId;
+    final Integer intervalSec;
+    final Boolean boostLowSoc;
+    final Integer lowSocPercent;
+
+    private ConfigImport(String serverUrl, String token, String installationId, Integer intervalSec,
+                         Boolean boostLowSoc, Integer lowSocPercent) {
+        this.serverUrl = serverUrl;
+        this.token = token;
+        this.installationId = installationId;
+        this.intervalSec = intervalSec;
+        this.boostLowSoc = boostLowSoc;
+        this.lowSocPercent = lowSocPercent;
+    }
+
+    /** True when the file yielded nothing usable — an empty or malformed file, not a config. */
+    boolean isEmpty() {
+        return serverUrl == null && token == null && installationId == null && intervalSec == null
+                && boostLowSoc == null && lowSocPercent == null;
+    }
+
+    static ConfigImport parse(String text) {
+        String serverUrl = null, token = null, installationId = null;
+        Integer intervalSec = null, lowSocPercent = null;
+        Boolean boostLowSoc = null;
+
+        for (String line : text.split("\n", -1)) {
+            line = line.trim();
+            if (line.isEmpty() || line.charAt(0) == '#') continue;
+
+            int sep = line.indexOf('=');
+            if (sep <= 0) continue;
+
+            String key = line.substring(0, sep).trim().toLowerCase(java.util.Locale.US);
+            String value = line.substring(sep + 1).trim();
+            if (value.isEmpty()) continue;
+
+            switch (key) {
+                case "server_url":
+                case "server":
+                case "url":
+                    serverUrl = value;
+                    break;
+                case "token":
+                case "ingest_token":
+                    token = value;
+                    break;
+                case "installation_id":
+                    installationId = value;
+                    break;
+                case "interval_sec":
+                case "upload_interval_sec":
+                    intervalSec = nearestInterval(value);
+                    break;
+                case "boost_low_soc":
+                    boostLowSoc = parseBool(value);
+                    break;
+                case "low_soc_percent":
+                    lowSocPercent = clampPercent(value);
+                    break;
+                default:
+                    // Unknown keys are ignored rather than rejected, so a file can carry
+                    // comments or future keys without breaking an older build.
+                    break;
+            }
+        }
+        return new ConfigImport(serverUrl, token, installationId, intervalSec, boostLowSoc, lowSocPercent);
+    }
+
+    /** Snaps to the nearest offered choice: the UI spinner has no free-form interval. */
+    private static Integer nearestInterval(String value) {
+        int requested;
+        try {
+            requested = Integer.parseInt(value);
+        } catch (NumberFormatException e) {
+            return null;
+        }
+        int best = UploadSettings.INTERVAL_CHOICES_SEC[0];
+        for (int choice : UploadSettings.INTERVAL_CHOICES_SEC) {
+            if (Math.abs(choice - requested) < Math.abs(best - requested)) best = choice;
+        }
+        return best;
+    }
+
+    /** Same 1–99 clamp the manual field enforces, so an import cannot set an unusable value. */
+    private static Integer clampPercent(String value) {
+        try {
+            return Math.max(1, Math.min(99, Integer.parseInt(value)));
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
+
+    private static Boolean parseBool(String value) {
+        value = value.toLowerCase(java.util.Locale.US);
+        if (value.equals("true") || value.equals("on") || value.equals("1")) return Boolean.TRUE;
+        if (value.equals("false") || value.equals("off") || value.equals("0")) return Boolean.FALSE;
+        return null;
+    }
+}
diff --git a/app/src/main/java/com/evsuite/abrp/ConsumptionCloudClient.java b/app/src/main/java/com/evsuite/abrp/ConsumptionCloudClient.java
index aec491d..0ac0a0e 100644
--- a/app/src/main/java/com/evsuite/abrp/ConsumptionCloudClient.java
+++ b/app/src/main/java/com/evsuite/abrp/ConsumptionCloudClient.java
@@ -20,12 +20,13 @@ import java.util.Collections;
 import java.util.List;
 
 /**
- * Best-effort MongoDB sync through the web API. Never blocks local persistence.
+ * Best-effort sync to the car server. Never blocks local persistence.
  *
- * The installationId is a fixed value baked into BuildConfig — never a random UUID — so an
- * APK wipe cannot orphan the cloud history under a new identity. The consumption UI reads
- * back its own uploaded totals via {@link #fetchHistoryIfDue}, which means an APK reinstall
- * picks up right where the old one left off instead of showing zeroes.
+ * Server URL, token and installation id come from {@link ServerConfig}, read on every use so
+ * a change in the Server tab applies at once. The installation id is kept across updates; a
+ * reinstall gets it back through the config file, so the history is not orphaned under a new
+ * identity. The consumption UI reads back its own uploaded totals via
+ * {@link #fetchHistoryIfDue}, so a reinstall picks up where the old one left off.
  */
 final class ConsumptionCloudClient {
     private static final String TAG = "NilsMG4.Mongo";
@@ -37,9 +38,7 @@ final class ConsumptionCloudClient {
     private static final String CHUNK_CACHE = "chunk_cache";   // JSON array of pending chunks
     private static final int MAX_CHARGES_PER_SYNC = 10;
 
-    private final String endpoint;
-    private final String token;
-    private final String installationId;
+    private final Context context;
     private final SharedPreferences prefs;
     private long lastConsumptionAttemptMs;
     private long lastChargeAttemptMs;
@@ -65,14 +64,12 @@ final class ConsumptionCloudClient {
     }
 
     ConsumptionCloudClient(Context context) {
-        endpoint = BuildConfig.CONSUMPTION_API_URL.trim();
-        token = BuildConfig.CONSUMPTION_API_TOKEN.trim();
+        this.context = context.getApplicationContext();
         prefs = context.getSharedPreferences(PREFS, Context.MODE_PRIVATE);
-        installationId = BuildConfig.CONSUMPTION_INSTALLATION_ID.trim();
-        if (endpoint.isEmpty() || token.isEmpty()) {
-            Log.w(TAG, "Consumption API not configured: endpoint=" + (endpoint.isEmpty() ? "empty" : "ok")
-                    + ", token=" + (token.isEmpty() ? "empty" : "ok"));
-        }
+    }
+
+    private ServerConfig config() {
+        return ServerConfig.get(context);
     }
 
     /**
@@ -87,7 +84,7 @@ final class ConsumptionCloudClient {
      */
     void syncIfDue(ConsumptionTracker tracker, ChargeSessionTracker charges, long nowMs) {
         long elapsed = android.os.SystemClock.elapsedRealtime();
-        if (endpoint.isEmpty() || token.isEmpty()) {
+        if (!config().isConfigured()) {
             Log.i(TAG, "Sync skipped: API not configured");
             return;
         }
@@ -200,7 +197,7 @@ final class ConsumptionCloudClient {
     private JSONObject consumptionBody(ConsumptionTracker.CloudSnapshot snapshot, long nowMs)
             throws Exception {
         JSONObject body = new JSONObject()
-                .put("installationId", installationId)
+                .put("installationId", config().installationId)
                 .put("recordedAt", nowMs)
                 .put("date", snapshot.date)
                 .put("day", totals(snapshot.day));
@@ -230,7 +227,7 @@ final class ConsumptionCloudClient {
         Log.i(TAG, "Found " + pending.size() + " pending charge sessions");
         int sent = 0;
         for (JSONObject session : pending) {
-            JSONObject body = new JSONObject(session.toString()).put("installationId", installationId);
+            JSONObject body = new JSONObject(session.toString()).put("installationId", config().installationId);
             String id = session.getString("sessionId");
             Log.i(TAG, "Uploading charge session: " + id);
             if (send("/v1/charging-sessions/" + id, "PUT", body)) {
@@ -250,7 +247,7 @@ final class ConsumptionCloudClient {
         HttpURLConnection connection = null;
         try {
             byte[] bytes = body.toString().getBytes(StandardCharsets.UTF_8);
-            String url = trimSlash(endpoint) + path;
+            String url = trimSlash(config().url) + path;
             Log.i(TAG, "Sending " + method + " request to " + url + " (" + bytes.length + " bytes)");
             Log.i(TAG, "Body: " + body.toString());
             connection = (HttpURLConnection) new URL(url).openConnection();
@@ -260,7 +257,7 @@ final class ConsumptionCloudClient {
             connection.setDoOutput(true);
             connection.setFixedLengthStreamingMode(bytes.length);
             connection.setRequestProperty("Content-Type", "application/json");
-            connection.setRequestProperty("Authorization", "Bearer " + token);
+            connection.setRequestProperty("Authorization", "Bearer " + config().token);
             try (OutputStream out = connection.getOutputStream()) { out.write(bytes); }
             int status = connection.getResponseCode();
             Log.i(TAG, "Response: HTTP " + status);
@@ -295,7 +292,7 @@ final class ConsumptionCloudClient {
      * Returns the current cache immediately; the fresh copy lands on the next poll.
      */
     synchronized List<DayRecord> fetchHistoryIfDue() {
-        if (endpoint.isEmpty() || token.isEmpty()) return cachedHistory;
+        if (!config().isConfigured()) return cachedHistory;
         long elapsed = android.os.SystemClock.elapsedRealtime();
         if (lastHistoryFetchMs != 0L && elapsed - lastHistoryFetchMs < HISTORY_FETCH_INTERVAL_MS) {
             return cachedHistory;
@@ -329,7 +326,7 @@ final class ConsumptionCloudClient {
      * status for the log.
      */
     String flushNow(ConsumptionTracker tracker, long nowMs) {
-        if (endpoint.isEmpty() || token.isEmpty()) return "API not configured";
+        if (!config().isConfigured()) return "API not configured";
         int cached = drainChunkCache();
         ConsumptionTracker.CloudSnapshot chunk = tracker.takeChunkDelta();
         int total = cached;
@@ -357,12 +354,12 @@ final class ConsumptionCloudClient {
     private List<DayRecord> fetchHistory() throws Exception {
         HttpURLConnection connection = null;
         try {
-            String url = trimSlash(endpoint) + "/v1/consumption/history/" + installationId;
+            String url = trimSlash(config().url) + "/v1/consumption/history/" + config().installationId;
             connection = (HttpURLConnection) new URL(url).openConnection();
             connection.setRequestMethod("GET");
             connection.setConnectTimeout(TIMEOUT_MS);
             connection.setReadTimeout(TIMEOUT_MS);
-            connection.setRequestProperty("Authorization", "Bearer " + token);
+            connection.setRequestProperty("Authorization", "Bearer " + config().token);
             int status = connection.getResponseCode();
             Log.i(TAG, "History GET response: HTTP " + status);
             if (status < 200 || status >= 300) {
diff --git a/app/src/main/java/com/evsuite/abrp/MainActivity.java b/app/src/main/java/com/evsuite/abrp/MainActivity.java
index 475686c..75608b6 100644
--- a/app/src/main/java/com/evsuite/abrp/MainActivity.java
+++ b/app/src/main/java/com/evsuite/abrp/MainActivity.java
@@ -16,6 +16,8 @@ import android.widget.TextView;
 import java.time.LocalDate;
 import java.util.List;
 
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.app.AppCompatDelegate;
@@ -39,16 +41,18 @@ public class MainActivity extends AppCompatActivity {
 
     /** Navigation destinations in page order. Parallel to {@link #panes}. */
     private static final int[] TAB_IDS =
-            { R.id.tabVehicle, R.id.tabConsumption, R.id.tabCharging, R.id.tabService, R.id.tabWifi,
-              R.id.tabLog };
+            { R.id.tabVehicle, R.id.tabConsumption, R.id.tabCharging, R.id.tabService, R.id.tabServer,
+              R.id.tabWifi, R.id.tabLog };
 
     private static final int[] PAGE_TITLES = {
             R.string.design_overview_title, R.string.consumption_title, R.string.charging_title,
-            R.string.design_service_title, R.string.design_wifi_title, R.string.design_log_title
+            R.string.design_service_title, R.string.design_server_title, R.string.design_wifi_title,
+            R.string.design_log_title
     };
     private static final int[] PAGE_SUBTITLES = {
             R.string.design_overview_subtitle, R.string.consumption_subtitle, R.string.charging_subtitle,
-            R.string.design_service_subtitle, R.string.design_wifi_subtitle, R.string.design_log_subtitle
+            R.string.design_service_subtitle, R.string.design_server_subtitle, R.string.design_wifi_subtitle,
+            R.string.design_log_subtitle
     };
 
     // Status colours come from the palette, not from the Material swatches: #4CAF50 and
@@ -61,13 +65,14 @@ public class MainActivity extends AppCompatActivity {
     private TextView          statusText;
     private TextView callLogText;
     private View servicePane;
+    private View serverPane;
     private View logPane;
     private View vehiclePane;
     private View consumptionPane;
     private View chargingPane;
     private View wifiPane;
 
-    /** The six pages in navigation order. Parallel to {@link #TAB_IDS}. */
+    /** The pages in navigation order. Parallel to {@link #TAB_IDS}. */
     private View[] panes;
 
     /** Wi-Fi page. The helper is the same one the upload service uses on its own tick. */
@@ -102,6 +107,28 @@ public class MainActivity extends AppCompatActivity {
     private ChargeSessionTracker chargeSessionTracker;
     private ChargingGraphView chargeGraph;
 
+    /** Server page. */
+    private TextInputLayout serverUrlLayout, serverTokenLayout, installationIdLayout;
+    private TextInputEditText serverUrlInput, serverTokenInput, installationIdInput;
+    private View connectionStatusRow, connectionIndicator;
+    private TextView connectionStatusText;
+
+    /** Upload page: live telemetry switch and cadence. */
+    private SwitchMaterial liveTelemetrySwitch, boostSwitch;
+    private android.widget.Spinner intervalSpinner;
+    private TextInputLayout lowSocLayout;
+    private TextInputEditText lowSocInput;
+
+    /**
+     * Picks a config text file. Only reachable on devices that ship a document picker — the
+     * MG4 head unit does not, which is why {@link #startConfigImport()} scans the app's own
+     * folders first and only falls back to this.
+     */
+    private final ActivityResultLauncher<String[]> configPicker =
+            registerForActivityResult(new ActivityResultContracts.OpenDocument(), uri -> {
+                if (uri != null) importConfig(uri);
+            });
+
     /**
      * Inflates a page with no parent, then gives it the MATCH_PARENT/MATCH_PARENT layout
      * params ViewPager2 requires of its items — inflating detached leaves them null, and
@@ -201,17 +228,22 @@ public class MainActivity extends AppCompatActivity {
         // in activity_main.xml — a recycled page would invalidate these references as
         // soon as the user swiped away from it.
         servicePane = inflatePane(R.layout.pane_service);
+        serverPane  = inflatePane(R.layout.pane_server);
         vehiclePane   = inflatePane(R.layout.pane_vehicle);
         consumptionPane = inflatePane(R.layout.pane_consumption);
         chargingPane = inflatePane(R.layout.pane_charging);
         wifiPane    = inflatePane(R.layout.pane_wifi);
         logPane     = inflatePane(R.layout.pane_log);
-        panes = new View[] { vehiclePane, consumptionPane, chargingPane, servicePane, wifiPane, logPane };
+        panes = new View[] { vehiclePane, consumptionPane, chargingPane, servicePane, serverPane,
+                wifiPane, logPane };
 
         bindVehiclePane();
         bindConsumptionPane();
         bindChargingPane();
         bindWifiPane();
+        bindServerPane();
+        bindServicePane();
+        requestLocationPermissionIfNeeded();
 
         statusText          = servicePane.findViewById(R.id.status_text);
         callLogText = logPane.findViewById(R.id.call_log_text);
@@ -225,7 +257,7 @@ public class MainActivity extends AppCompatActivity {
         // a no-op and does not even contain the updater.
         UpdateHook.checkInBackground(this);
 
-        // The service is always-on: it tracks consumption and syncs to MongoDB cloud.
+        // The service is always-on: it tracks consumption and sends everything to the server.
         // startForegroundService is idempotent — if the service is already up this
         // is a no-op aside from delivering a new intent.
         startForegroundService(new Intent(this, AbrpUploadService.class));
@@ -337,6 +369,327 @@ public class MainActivity extends AppCompatActivity {
         });
     }
 
+    // ---------- Server page ----------
+
+    private void bindServerPane() {
+        serverUrlLayout      = serverPane.findViewById(R.id.server_url_layout);
+        serverTokenLayout    = serverPane.findViewById(R.id.server_token_layout);
+        installationIdLayout = serverPane.findViewById(R.id.installation_id_layout);
+        serverUrlInput       = serverPane.findViewById(R.id.server_url_input);
+        serverTokenInput     = serverPane.findViewById(R.id.server_token_input);
+        installationIdInput  = serverPane.findViewById(R.id.installation_id_input);
+        connectionStatusRow  = serverPane.findViewById(R.id.connection_status_row);
+        connectionIndicator  = serverPane.findViewById(R.id.connection_indicator);
+        connectionStatusText = serverPane.findViewById(R.id.connection_status_text);
+        showServerConfig();
+        ((TextView) serverPane.findViewById(R.id.import_hint))
+                .setText(getString(R.string.import_hint, configDirHint()));
+
+        serverPane.findViewById(R.id.server_save_button).setOnClickListener(v -> {
+            if (saveServerConfig(textOf(serverUrlInput), textOf(serverTokenInput), textOf(installationIdInput))) {
+                setConnectionStatus(COLOR_OK, getString(R.string.server_saved));
+            }
+        });
+        serverPane.findViewById(R.id.server_test_button).setOnClickListener(v -> testConnection());
+        serverPane.findViewById(R.id.import_button).setOnClickListener(v -> startConfigImport());
+    }
+
+    private void showServerConfig() {
+        ServerConfig config = ServerConfig.get(this);
+        serverUrlInput.setText(config.url);
+        serverTokenInput.setText(config.token);
+        installationIdInput.setText(config.installationId);
+    }
+
+    /** Validates, marks the bad fields, and saves only when all three are good. */
+    private boolean saveServerConfig(String rawUrl, String rawToken, String rawId) {
+        String url = ServerConfig.normalizeUrl(rawUrl);
+        String token = rawToken == null ? "" : rawToken.trim();
+        String id = rawId == null ? "" : rawId.trim().toLowerCase(java.util.Locale.US);
+        serverUrlLayout.setError(url == null ? getString(R.string.server_err_url) : null);
+        serverTokenLayout.setError(ServerConfig.isValidToken(token) ? null : getString(R.string.server_err_token));
+        installationIdLayout.setError(ServerConfig.isValidInstallationId(id)
+                ? null : getString(R.string.server_err_installation_id));
+        if (url == null || !ServerConfig.isValidToken(token) || !ServerConfig.isValidInstallationId(id)) return false;
+        ServerConfig.save(this, url, token, id);
+        if (consumptionCloudClient != null) consumptionCloudClient.invalidateHistory();
+        showServerConfig();
+        refreshStatus();
+        return true;
+    }
+
+    /**
+     * Checks reachability, then the token, without writing anything: the health endpoint
+     * first, then the car's own history read, which needs the ingest token. Uses what is in
+     * the fields, saved or not, so a typo can be caught before it is stored.
+     */
+    private void testConnection() {
+        String url = ServerConfig.normalizeUrl(textOf(serverUrlInput));
+        String token = textOf(serverTokenInput);
+        String id = textOf(installationIdInput).toLowerCase(java.util.Locale.US);
+        if (url == null) {
+            serverUrlLayout.setError(getString(R.string.server_err_url));
+            return;
+        }
+        if (!ServerConfig.isValidInstallationId(id)) {
+            installationIdLayout.setError(getString(R.string.server_err_installation_id));
+            return;
+        }
+        setConnectionStatus(COLOR_PENDING, getString(R.string.conn_testing));
+        new Thread(() -> {
+            String message;
+            int color;
+            try {
+                int health = httpGet(url + "/v1/health", null);
+                if (health != 200) {
+                    message = getString(R.string.conn_err_http, health);
+                    color = COLOR_ERROR;
+                } else {
+                    int auth = httpGet(url + "/v1/consumption/history/" + id, token);
+                    if (auth == 200) { message = getString(R.string.conn_ok); color = COLOR_OK; }
+                    else if (auth == 401) { message = getString(R.string.conn_err_auth); color = COLOR_ERROR; }
+                    else { message = getString(R.string.conn_err_http, auth); color = COLOR_ERROR; }
+                }
+            } catch (java.net.SocketTimeoutException e) {
+                message = getString(R.string.conn_err_timeout);
+                color = COLOR_ERROR;
+            } catch (Exception e) {
+                message = getString(R.string.conn_err_no_internet);
+                color = COLOR_ERROR;
+            }
+            final String m = message;
+            final int c = color;
+            runOnUiThread(() -> setConnectionStatus(c, m));
+        }, "server-test").start();
+    }
+
+    private static int httpGet(String url, String token) throws java.io.IOException {
+        java.net.HttpURLConnection connection = (java.net.HttpURLConnection) new java.net.URL(url).openConnection();
+        try {
+            connection.setConnectTimeout(8_000);
+            connection.setReadTimeout(8_000);
+            if (token != null) connection.setRequestProperty("Authorization", "Bearer " + token);
+            return connection.getResponseCode();
+        } finally {
+            connection.disconnect();
+        }
+    }
+
+    private void setConnectionStatus(int color, String message) {
+        connectionStatusRow.setVisibility(View.VISIBLE);
+        connectionIndicator.getBackground().mutate().setTint(color);
+        connectionStatusText.setText(message);
+        connectionStatusText.setTextColor(color);
+    }
+
+    // ---------- Config import ----------
+
+    /**
+     * The MG4 head unit ships no document picker — SAF answers "FileManagement is no supported
+     * on this device" — so the file is found by scanning instead. getExternalFilesDirs() returns
+     * this app's own folder on internal storage and on every mounted volume including a USB
+     * stick, and those need no storage permission at any API level. The picker stays as the
+     * fallback for phones and tablets, where the user may keep the file anywhere.
+     */
+    private void startConfigImport() {
+        java.io.File found = findConfigFile();
+        if (found != null) {
+            importConfig(found);
+            return;
+        }
+        try {
+            // Any MIME: the MG4 Files app tags .txt inconsistently, so filtering by type hides
+            // the very file the user is trying to pick. They select it by name instead.
+            configPicker.launch(new String[]{"*/*"});
+        } catch (android.content.ActivityNotFoundException e) {
+            setConnectionStatus(COLOR_ERROR, getString(R.string.import_err_not_found, configDirHint()));
+        }
+    }
+
+    /**
+     * First readable file in an app-specific folder that parses as a config. Names are not
+     * filtered: the user copies one file to the folder, whatever they called it.
+     */
+    private java.io.File findConfigFile() {
+        for (java.io.File dir : getExternalFilesDirs(null)) {
+            if (dir == null) continue;
+            java.io.File[] files = dir.listFiles();
+            if (files == null) continue;
+            for (java.io.File f : files) {
+                if (f.isFile() && f.canRead() && f.length() > 0 && f.length() <= 64 * 1024
+                        && !ConfigImport.parse(readText(f)).isEmpty()) {
+                    return f;
+                }
+            }
+        }
+        return null;
+    }
+
+    /** File text, or "" when unreadable — callers treat that as "not a config". */
+    private String readText(java.io.File file) {
+        try (java.io.InputStream in = new java.io.FileInputStream(file)) {
+            return readCapped(in);
+        } catch (Exception e) {
+            return "";
+        }
+    }
+
+    /** Capped so a wrong file picked by mistake is not slurped whole into memory. */
+    private String readCapped(java.io.InputStream in) throws java.io.IOException {
+        java.io.ByteArrayOutputStream buf = new java.io.ByteArrayOutputStream();
+        byte[] chunk = new byte[4096];
+        int n;
+        while ((n = in.read(chunk)) != -1 && buf.size() < 64 * 1024) buf.write(chunk, 0, n);
+        return buf.toString(java.nio.charset.StandardCharsets.UTF_8.name());
+    }
+
+    /** Where the user should drop the file. */
+    private String configDirHint() {
+        java.io.File[] dirs = getExternalFilesDirs(null);
+        return dirs.length > 0 && dirs[0] != null ? dirs[0].getAbsolutePath() : "";
+    }
+
+    private void importConfig(java.io.File file) {
+        String text = readText(file);
+        if (text.isEmpty()) {
+            setConnectionStatus(COLOR_ERROR, getString(R.string.import_err_read));
+            return;
+        }
+        applyConfig(text);
+    }
+
+    private void importConfig(Uri uri) {
+        String text;
+        try (java.io.InputStream in = getContentResolver().openInputStream(uri)) {
+            if (in == null) throw new java.io.IOException("no stream");
+            text = readCapped(in);
+        } catch (Exception e) {
+            setConnectionStatus(COLOR_ERROR, getString(R.string.import_err_read));
+            return;
+        }
+        applyConfig(text);
+    }
+
+    /**
+     * Applies whatever the file sets; absent keys keep their current value, so a file with
+     * only the token does not wipe the URL. Server settings are validated and saved together;
+     * cadence keys go to the plain prefs the same way the Upload page writes them.
+     */
+    private void applyConfig(String text) {
+        ConfigImport config = ConfigImport.parse(text);
+        if (config.isEmpty()) {
+            setConnectionStatus(COLOR_ERROR, getString(R.string.import_err_empty));
+            return;
+        }
+        ServerConfig current = ServerConfig.get(this);
+        if (config.serverUrl != null || config.token != null || config.installationId != null) {
+            boolean saved = saveServerConfig(
+                    config.serverUrl != null ? config.serverUrl : current.url,
+                    config.token != null ? config.token : current.token,
+                    config.installationId != null ? config.installationId : current.installationId);
+            if (!saved) {
+                // Show what the file said, so the marked field is the one to fix in the file.
+                if (config.serverUrl != null) serverUrlInput.setText(config.serverUrl);
+                if (config.token != null) serverTokenInput.setText(config.token);
+                if (config.installationId != null) installationIdInput.setText(config.installationId);
+                return;
+            }
+        }
+        SharedPreferences.Editor edit = prefs.edit();
+        if (config.intervalSec != null) edit.putInt(UploadSettings.KEY_INTERVAL_SEC, config.intervalSec);
+        if (config.boostLowSoc != null) edit.putBoolean(UploadSettings.KEY_BOOST_LOW_SOC, config.boostLowSoc);
+        if (config.lowSocPercent != null) edit.putInt(UploadSettings.KEY_LOW_SOC_PERCENT, config.lowSocPercent);
+        edit.apply();
+        bindCadenceControls();
+        setConnectionStatus(COLOR_OK, getString(R.string.import_ok));
+        refreshStatus();
+    }
+
+    // ---------- Upload page ----------
+
+    private void bindServicePane() {
+        liveTelemetrySwitch = servicePane.findViewById(R.id.abrp_upload_switch);
+        intervalSpinner = servicePane.findViewById(R.id.interval_spinner);
+        boostSwitch = servicePane.findViewById(R.id.boost_switch);
+        lowSocInput = servicePane.findViewById(R.id.low_soc_input);
+        lowSocLayout = servicePane.findViewById(R.id.low_soc_layout);
+        liveTelemetrySwitch.setChecked(UploadSettings.from(prefs).abrpUploadEnabled);
+        liveTelemetrySwitch.setOnCheckedChangeListener((btn, checked) -> {
+            prefs.edit().putBoolean(UploadSettings.KEY_ABRP_UPLOAD_ENABLED, checked).apply();
+            refreshStatus();
+        });
+        bindCadenceControls();
+    }
+
+    /** The service reads these settings on every tick, so a change applies without a restart. */
+    private void bindCadenceControls() {
+        UploadSettings current = UploadSettings.from(prefs);
+
+        String[] labels = new String[UploadSettings.INTERVAL_CHOICES_SEC.length];
+        int selected = 0;
+        for (int i = 0; i < UploadSettings.INTERVAL_CHOICES_SEC.length; i++) {
+            int sec = UploadSettings.INTERVAL_CHOICES_SEC[i];
+            labels[i] = sec >= 60
+                    ? getResources().getQuantityString(R.plurals.interval_minutes, sec / 60, sec / 60)
+                    : getResources().getQuantityString(R.plurals.interval_seconds, sec, sec);
+            if (sec == current.intervalSec) selected = i;
+        }
+        android.widget.ArrayAdapter<String> adapter = new android.widget.ArrayAdapter<>(
+                this, R.layout.spinner_value, labels);
+        adapter.setDropDownViewResource(R.layout.spinner_dropdown);
+        intervalSpinner.setAdapter(adapter);
+        intervalSpinner.setSelection(selected);
+        intervalSpinner.setOnItemSelectedListener(new android.widget.AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(android.widget.AdapterView<?> parent, View view, int position, long id) {
+                prefs.edit().putInt(UploadSettings.KEY_INTERVAL_SEC,
+                        UploadSettings.INTERVAL_CHOICES_SEC[position]).apply();
+            }
+            @Override public void onNothingSelected(android.widget.AdapterView<?> parent) { }
+        });
+
+        boostSwitch.setOnCheckedChangeListener(null);
+        boostSwitch.setChecked(current.boostLowSoc);
+        lowSocLayout.setEnabled(current.boostLowSoc);
+        lowSocInput.setEnabled(current.boostLowSoc);
+        boostSwitch.setOnCheckedChangeListener((button, checked) -> {
+            prefs.edit().putBoolean(UploadSettings.KEY_BOOST_LOW_SOC, checked).apply();
+            lowSocLayout.setEnabled(checked);
+            lowSocInput.setEnabled(checked);
+        });
+
+        lowSocInput.setText(String.valueOf(current.lowSocPercent));
+        lowSocInput.setOnFocusChangeListener((view, hasFocus) -> {
+            if (!hasFocus) saveLowSocThreshold();
+        });
+    }
+
+    /** Clamped to 1-99: 0 would never trigger and 100 would boost permanently. */
+    private void saveLowSocThreshold() {
+        CharSequence raw = lowSocInput.getText();
+        int value;
+        try {
+            value = Integer.parseInt(raw == null ? "" : raw.toString().trim());
+        } catch (NumberFormatException e) {
+            value = UploadSettings.DEFAULT_LOW_SOC_PERCENT;
+        }
+        value = Math.max(1, Math.min(99, value));
+        lowSocInput.setText(String.valueOf(value));
+        prefs.edit().putInt(UploadSettings.KEY_LOW_SOC_PERCENT, value).apply();
+    }
+
+    /**
+     * GPS for the telemetry position. On the car the app runs as the system user and holds
+     * it already; this only asks where it does not, such as a phone running the stable build.
+     */
+    private void requestLocationPermissionIfNeeded() {
+        if (checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION)
+                != PackageManager.PERMISSION_GRANTED) {
+            requestPermissions(new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION,
+                    android.Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
+        }
+    }
+
     // ---------- Wi-Fi page ----------
 
     private void bindWifiPane() {
@@ -764,8 +1117,16 @@ public class MainActivity extends AppCompatActivity {
                 break;
             case RUNNING:
             case STARTING:
-                statusText.setText("Consumption tracking active");
-                statusText.setTextColor(COLOR_OK);
+                if (!ServerConfig.get(this).isConfigured()) {
+                    statusText.setText(R.string.server_not_configured);
+                    statusText.setTextColor(COLOR_ERROR);
+                } else if (!UploadSettings.from(prefs).abrpUploadEnabled) {
+                    statusText.setText(R.string.state_tracking_locally);
+                    statusText.setTextColor(COLOR_PENDING);
+                } else {
+                    statusText.setText(R.string.state_running);
+                    statusText.setTextColor(COLOR_OK);
+                }
                 break;
             case STOPPED:
             default:
diff --git a/app/src/main/java/com/evsuite/abrp/SecurePrefs.java b/app/src/main/java/com/evsuite/abrp/SecurePrefs.java
new file mode 100644
index 0000000..3d51282
--- /dev/null
+++ b/app/src/main/java/com/evsuite/abrp/SecurePrefs.java
@@ -0,0 +1,48 @@
+package com.evsuite.abrp;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import androidx.security.crypto.EncryptedSharedPreferences;
+import androidx.security.crypto.MasterKey;
+
+/**
+ * Encrypted storage for the server settings — above all the ingest token, which `adb backup`
+ * would otherwise hand out with the regular SharedPreferences file. Backed by an
+ * AndroidKeyStore master key.
+ */
+final class SecurePrefs {
+
+    private static final String TAG        = "SecurePrefs";
+    private static final String FILE_NAME  = "server_secure_prefs";
+    private static final String PLAIN_NAME = "server_prefs";
+
+    private static SharedPreferences instance;
+
+    private SecurePrefs() { }
+
+    /**
+     * Encrypted preferences, or a plaintext file if the crypto stack is unavailable. Falling
+     * back keeps the app usable on a head unit with a broken keystore instead of crashing it.
+     */
+    static synchronized SharedPreferences get(Context context) {
+        if (instance != null) return instance;
+        Context app = context.getApplicationContext();
+        try {
+            MasterKey masterKey = new MasterKey.Builder(app)
+                    .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
+                    .build();
+            instance = EncryptedSharedPreferences.create(
+                    app,
+                    FILE_NAME,
+                    masterKey,
+                    EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+                    EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM);
+        } catch (Exception e) {
+            Log.e(TAG, "Encrypted preferences unavailable, falling back to plaintext", e);
+            instance = app.getSharedPreferences(PLAIN_NAME, Context.MODE_PRIVATE);
+        }
+        return instance;
+    }
+}
diff --git a/app/src/main/java/com/evsuite/abrp/ServerConfig.java b/app/src/main/java/com/evsuite/abrp/ServerConfig.java
new file mode 100644
index 0000000..af36f73
--- /dev/null
+++ b/app/src/main/java/com/evsuite/abrp/ServerConfig.java
@@ -0,0 +1,100 @@
+package com.evsuite.abrp;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import java.util.Locale;
+import java.util.UUID;
+import java.util.regex.Pattern;
+
+/**
+ * Where the car's data goes: the server URL, its ingest token, and the installation id the
+ * data is stored under. Entered in the Server tab or imported from a config file, kept in
+ * {@link SecurePrefs}.
+ *
+ * Read through {@link #get}, which caches one immutable snapshot for the process and is
+ * replaced on {@link #save}: the service and the activity both see a change at once, without
+ * a restart.
+ */
+final class ServerConfig {
+
+    static final String KEY_URL             = "server_url";
+    static final String KEY_TOKEN           = "ingest_token";
+    static final String KEY_INSTALLATION_ID = "installation_id";
+
+    /** Same rule as the server: a version 1–5 UUID with the RFC 4122 variant. */
+    private static final Pattern UUID_PATTERN = Pattern.compile(
+            "^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$",
+            Pattern.CASE_INSENSITIVE);
+
+    /** The server refuses shorter ingest tokens outright. */
+    static final int MIN_TOKEN_LENGTH = 24;
+
+    final String url;
+    final String token;
+    final String installationId;
+
+    private static volatile ServerConfig current;
+
+    ServerConfig(String url, String token, String installationId) {
+        this.url = url;
+        this.token = token;
+        this.installationId = installationId;
+    }
+
+    boolean isConfigured() {
+        return !url.isEmpty() && !token.isEmpty();
+    }
+
+    static ServerConfig get(Context context) {
+        ServerConfig config = current;
+        if (config != null) return config;
+        synchronized (ServerConfig.class) {
+            if (current != null) return current;
+            SharedPreferences prefs = SecurePrefs.get(context);
+            String id = prefs.getString(KEY_INSTALLATION_ID, "");
+            if (!isValidInstallationId(id)) {
+                // First start: this installation gets its own identity, kept from now on.
+                id = UUID.randomUUID().toString();
+                prefs.edit().putString(KEY_INSTALLATION_ID, id).apply();
+            }
+            current = new ServerConfig(prefs.getString(KEY_URL, ""), prefs.getString(KEY_TOKEN, ""), id);
+            return current;
+        }
+    }
+
+    /** Stores already-validated values; see {@link #validate}. */
+    static synchronized void save(Context context, String url, String token, String installationId) {
+        SecurePrefs.get(context).edit()
+                .putString(KEY_URL, url)
+                .putString(KEY_TOKEN, token)
+                .putString(KEY_INSTALLATION_ID, installationId)
+                .apply();
+        current = new ServerConfig(url, token, installationId);
+    }
+
+    // ---------- Validation (pure, unit-tested) ----------
+
+    /**
+     * The URL as it will be used: trimmed, without a trailing slash. Null when it is not an
+     * https URL with a host — the token travels in a header, so plain http is refused.
+     */
+    static String normalizeUrl(String raw) {
+        if (raw == null) return null;
+        String url = raw.trim();
+        while (url.endsWith("/")) url = url.substring(0, url.length() - 1);
+        if (!url.toLowerCase(Locale.US).startsWith("https://")) return null;
+        String rest = url.substring("https://".length());
+        if (rest.isEmpty() || rest.startsWith("/") || rest.contains(" ") || rest.contains("?")
+                || rest.contains("#") || rest.contains("@")) return null;
+        return url;
+    }
+
+    static boolean isValidToken(String token) {
+        return token != null && token.trim().length() >= MIN_TOKEN_LENGTH && !token.trim().contains(" ");
+    }
+
+    static boolean isValidInstallationId(String id) {
+        return id != null && UUID_PATTERN.matcher(id.trim()).matches();
+    }
+}
diff --git a/app/src/main/java/com/evsuite/abrp/TelemetryPayload.java b/app/src/main/java/com/evsuite/abrp/TelemetryPayload.java
new file mode 100644
index 0000000..2d80635
--- /dev/null
+++ b/app/src/main/java/com/evsuite/abrp/TelemetryPayload.java
@@ -0,0 +1,213 @@
+package com.evsuite.abrp;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * Builds one live telemetry sample in ABRP's tlm format. The car server stores it and forwards
+ * the newest one to ABRP, so the field names and units are exactly ABRP's.
+ *
+ * Kept free of Android types so it can be unit-tested on the JVM: the caller
+ * pulls the values out of the car adapter and the Location, this class only
+ * decides what ends up in the payload.
+ *
+ * Every vehicle field is nullable and a null field is OMITTED. A property that
+ * cannot be read is not a zero: sending soc:0 because a getter threw tells ABRP
+ * the battery is empty and wrecks the user's route plan.
+ *
+ * Fields are set by name rather than passed positionally. The payload now carries
+ * 24 optional values and a positional build(...) call had become a wall of nulls
+ * that no reader could check against the ABRP field list.
+ */
+final class TelemetryPayload {
+
+    /** Only value that is always present. Epoch SECONDS, not milliseconds. */
+    private final long utc;
+
+    // --- High priority (ABRP: "many features will only be usable with enough data") ---
+    Integer soc;             // %
+    Float   speedKmh;        // km/h
+    Float   powerKw;         // kW, ABRP sign: positive leaving the battery
+    Boolean charging;
+    Boolean dcfc;
+    Boolean parked;
+    Double  lat;             // °
+    Double  lon;             // °
+
+    // --- Lower priority ---
+    Integer rangeKm;         // km, vehicle's own estimate
+    Float   cabinTemp;       // °C
+    Float   battTempC;       // °C, traction battery
+    Float   capacityKwh;     // kWh, usable pack capacity
+    Float   soeKwh;          // kWh, energy currently in the pack
+    Double  kwhCharged;      // kWh, taken by the pack during the current charge session
+    Float   extTempC;        // °C, outside
+    Float   voltageV;        // V, traction battery
+    Float   currentA;        // A, traction battery
+    Float   odometerKm;      // km
+    Float   hvacSetpointC;   // °C, climate setpoint
+    Float   tirePressureFlKpa;
+    Float   tirePressureFrKpa;
+    Float   tirePressureRlKpa;
+    Float   tirePressureRrKpa;
+    Double  elevation;       // m
+    Float   heading;         // °
+
+    TelemetryPayload(long utc) {
+        this.utc = utc;
+    }
+
+    /** Build the {@code tlm} JSON object. Only utc is always present. */
+    String build() {
+        JSONObject tlm = new JSONObject();
+        try {
+            tlm.put("utc", utc);
+
+            putIfPresent(tlm, "soc", soc);
+            putIfPresent(tlm, "speed", speedKmh == null ? null : Math.round(speedKmh));
+            putIfPresent(tlm, "est_battery_range", rangeKm);
+            if (powerKw != null) tlm.put("power", round2(powerKw));
+            putIfPresent(tlm, "is_charging", boolToInt(charging));
+            putIfPresent(tlm, "is_dcfc", boolToInt(dcfc));
+            putIfPresent(tlm, "is_parked", boolToInt(parked));
+
+            // Only send cabin_temp if we got a plausible reading — 0.0 likely
+            // means the property isn't supported on this VHAL.
+            if (isPlausibleTemp(cabinTemp)) {
+                tlm.put("cabin_temp", Math.round(cabinTemp));
+            }
+            // Same guard for the pack: a VHAL that does not implement the property
+            // answers 0.0, and "battery at 0 °C" is a reading ABRP acts on.
+            if (isPlausibleTemp(battTempC)) {
+                tlm.put("batt_temp", Math.round(battTempC));
+            }
+            // hvac_setpoint is a user setting, so 0 °C is not a real value either —
+            // no cabin climate control is ever set to freezing.
+            if (isPlausibleTemp(hvacSetpointC)) {
+                tlm.put("hvac_setpoint", Math.round(hvacSetpointC));
+            }
+
+            // A pack cannot hold 0 kWh and a car cannot have driven 0 km by the time
+            // it runs this app: both zeros mean "property not implemented".
+            if (capacityKwh != null && capacityKwh > 0f) {
+                tlm.put("capacity", round2(capacityKwh));
+            }
+            if (odometerKm != null && odometerKm > 0f) {
+                tlm.put("odometer", Math.round(odometerKm));
+            }
+            // Same reasoning as capacity: a car that is running this app has some energy
+            // in its pack, so 0 kWh is the VHAL saying it does not implement the property.
+            if (soeKwh != null && soeKwh > 0f) {
+                tlm.put("soe", round2(soeKwh));
+            }
+            // 0.0 IS meaningful here — it is a charge session that has just begun — so
+            // This one is guarded on null only. EVHardware's charging-session meter sends
+            // null between sessions.
+            if (kwhCharged != null) {
+                tlm.put("kwh_charged", kwhCharged.doubleValue());
+            }
+            if (isPlausibleTemp(extTempC)) {
+                tlm.put("ext_temp", Math.round(extTempC));
+            }
+            // A pack under load is never at 0 V; 0 is the property not being implemented.
+            if (voltageV != null && voltageV > 0f && voltageV < 1500f) {
+                tlm.put("voltage", round2(voltageV));
+            }
+            // 0 A is a real reading (idle), so this one is guarded on range only.
+            if (currentA != null && currentA > -2000f && currentA < 2000f) {
+                tlm.put("current", round2(currentA));
+            }
+
+            putIfPresent(tlm, "tire_pressure_fl", kpa(tirePressureFlKpa));
+            putIfPresent(tlm, "tire_pressure_fr", kpa(tirePressureFrKpa));
+            putIfPresent(tlm, "tire_pressure_rl", kpa(tirePressureRlKpa));
+            putIfPresent(tlm, "tire_pressure_rr", kpa(tirePressureRrKpa));
+
+            if (lat != null && lon != null) {
+                tlm.put("lat", lat.doubleValue());
+                tlm.put("lon", lon.doubleValue());
+                putIfPresent(tlm, "elevation", elevation == null ? null : Math.round(elevation));
+                putIfPresent(tlm, "heading", heading == null ? null : Math.round(heading));
+            }
+        } catch (JSONException e) {
+            // JSONObject.put only throws on NaN/Infinity values, which the guards above
+            // already exclude. Returning just the timestamp keeps the upload alive.
+            return "{\"utc\":" + utc + "}";
+        }
+        return tlm.toString();
+    }
+
+    /**
+     * True for a temperature that a sensor could actually have measured. Excludes exactly
+     * 0.0, which is what an unimplemented VHAL property returns — see cabin_temp above.
+     *
+     * Package-private because the service asks the same question before deciding whether to
+     * look for an outside temperature somewhere other than the car.
+     */
+    static boolean isPlausibleTemp(Float celsius) {
+        return celsius != null && celsius > -50f && celsius < 80f && celsius != 0f;
+    }
+
+    /**
+     * Rounded kPa, or null when the reading is outside anything a road tyre reports.
+     * A flat tyre still reads well above zero, so 0 means the wheel has no sensor.
+     */
+    private static Integer kpa(Float pressure) {
+        if (pressure == null || pressure < 50f || pressure > 500f) return null;
+        return Math.round(pressure);
+    }
+
+    private static void putIfPresent(JSONObject json, String key, Object value)
+            throws JSONException {
+        if (value != null) json.put(key, value);
+    }
+
+    private static Integer boolToInt(Boolean value) {
+        return value == null ? null : (value ? 1 : 0);
+    }
+
+    /** ABRP expects kW with 2 decimals; avoids a locale-dependent String.format. */
+    private static double round2(float value) {
+        return Math.round(value * 100.0) / 100.0;
+    }
+
+    /**
+     * Every field {@link #build()} can emit, in the order the summary lists them.
+     * Used only to work out what was left out — see {@link #summarize(String)}.
+     */
+    private static final String[] ALL_FIELDS = {
+            "utc", "soc", "speed", "power", "est_battery_range", "cabin_temp",
+            "batt_temp", "hvac_setpoint", "capacity", "soe", "kwh_charged", "odometer",
+            "is_charging", "is_dcfc", "is_parked", "lat", "lon", "elevation", "heading",
+            "tire_pressure_fl", "tire_pressure_fr", "tire_pressure_rl", "tire_pressure_rr",
+            "ext_temp", "voltage", "current",
+    };
+
+    /**
+     * One-line, human-readable digest of an upload: what was sent, and what was left out.
+     *
+     * Derived from the JSON that actually goes on the wire rather than from the fields
+     * above, so it cannot drift away from the payload it claims to describe — which is
+     * the whole point of having it when a value on the ABRP side looks wrong.
+     */
+    static String summarize(String tlmJson) {
+        JSONObject tlm;
+        try {
+            tlm = new JSONObject(tlmJson);
+        } catch (JSONException e) {
+            return "unparseable payload: " + tlmJson;
+        }
+        StringBuilder sent = new StringBuilder();
+        StringBuilder omitted = new StringBuilder();
+        for (String field : ALL_FIELDS) {
+            if (tlm.has(field)) {
+                if (sent.length() > 0) sent.append(' ');
+                sent.append(field).append('=').append(tlm.opt(field));
+            } else {
+                if (omitted.length() > 0) omitted.append(',');
+                omitted.append(field);
+            }
+        }
+        return sent + (omitted.length() == 0 ? "" : " | omitted: " + omitted);
+    }
+}
diff --git a/app/src/main/java/com/evsuite/abrp/TelemetryQueue.java b/app/src/main/java/com/evsuite/abrp/TelemetryQueue.java
new file mode 100644
index 0000000..3ce0bf9
--- /dev/null
+++ b/app/src/main/java/com/evsuite/abrp/TelemetryQueue.java
@@ -0,0 +1,59 @@
+package com.evsuite.abrp;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Live samples waiting to reach the server, oldest first.
+ *
+ * Bounded: while the car is offline the oldest samples are dropped once {@link #capacity}
+ * is reached, so a long dead spot costs the start of the gap, never the head unit's memory.
+ * Held in memory only — a process restart loses what is queued, which is the price of not
+ * writing to flash every 15 seconds.
+ *
+ * Free of Android types so the policy is unit-tested on the JVM.
+ */
+final class TelemetryQueue {
+
+    /** About eight hours at one sample per 15-second tick. */
+    static final int DEFAULT_CAPACITY = 2000;
+    /** The server takes at most 500 samples per request. */
+    static final int MAX_BATCH = 500;
+
+    private final int capacity;
+    private final ArrayDeque<String> samples = new ArrayDeque<>();
+    private int dropped;
+
+    TelemetryQueue() { this(DEFAULT_CAPACITY); }
+
+    TelemetryQueue(int capacity) { this.capacity = capacity; }
+
+    synchronized void add(String sampleJson) {
+        if (samples.size() >= capacity) {
+            samples.removeFirst();
+            dropped++;
+        }
+        samples.addLast(sampleJson);
+    }
+
+    /** Up to {@link #MAX_BATCH} of the oldest samples, still queued until {@link #remove}. */
+    synchronized List<String> peekBatch() {
+        List<String> batch = new ArrayList<>(Math.min(samples.size(), MAX_BATCH));
+        for (String sample : samples) {
+            if (batch.size() >= MAX_BATCH) break;
+            batch.add(sample);
+        }
+        return batch;
+    }
+
+    /** Drops the oldest {@code count} samples once the server has confirmed them. */
+    synchronized void remove(int count) {
+        for (int i = 0; i < count && !samples.isEmpty(); i++) samples.removeFirst();
+    }
+
+    synchronized int size() { return samples.size(); }
+
+    /** Samples lost to the capacity limit since the queue was created. */
+    synchronized int dropped() { return dropped; }
+}
diff --git a/app/src/main/java/com/evsuite/abrp/TelemetryUploader.java b/app/src/main/java/com/evsuite/abrp/TelemetryUploader.java
new file mode 100644
index 0000000..ce2b0a7
--- /dev/null
+++ b/app/src/main/java/com/evsuite/abrp/TelemetryUploader.java
@@ -0,0 +1,264 @@
+package com.evsuite.abrp;
+
+import android.content.Context;
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.os.Bundle;
+import android.os.Looper;
+import android.os.SystemClock;
+import android.util.Log;
+
+import com.evsuite.hardware.telemetry.EnergySnapshot;
+import com.evsuite.hardware.telemetry.TirePressureSnapshot;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Live telemetry to the car server, which stores it and forwards the newest sample to ABRP.
+ *
+ * Called on every service tick. While the car is in use every tick becomes a sample; the
+ * queue is sent when {@link UploadCadence} says so — every tick on a state change, otherwise
+ * at the configured interval. Parked and not charging, a sample is only taken when one is
+ * sent, every 15 minutes: nothing changes, and a sample every 15 s overnight is waste.
+ *
+ * Runs on the service's scheduler thread; the HTTP calls block it, with short timeouts.
+ * Location updates arrive on the main looper and are only read here.
+ */
+final class TelemetryUploader {
+
+    private static final String TAG = "NilsMG4.Telemetry";
+    private static final int TIMEOUT_MS = 8_000;
+    /** Batches per tick: a backlog drains over a few ticks instead of stalling one. */
+    private static final int MAX_BATCHES_PER_TICK = 2;
+    /** A fix older than this no longer says where the car is; position is omitted. */
+    private static final long MIN_LOCATION_MAX_AGE_MS = 5 * 60_000L;
+    private static final long LOCATION_RETRY_MS = 30_000L;
+
+    private final Context context;
+    private final TelemetryQueue queue = new TelemetryQueue();
+    private final ChargingSignal chargingSignal = new ChargingSignal();
+
+    private volatile Location lastLocation;
+    private volatile boolean locationActive;
+    private volatile long lastLocationRequestMs;
+    private LocationManager locationManager;
+
+    private long lastUploadAttemptMs;
+    private Boolean lastParked;
+    private Boolean lastCharging;
+
+    TelemetryUploader(Context context) {
+        this.context = context.getApplicationContext();
+    }
+
+    // ---------- Tick ----------
+
+    void tick(EnergySnapshot vehicle, ChargeSessionTracker.Snapshot session, UploadSettings settings) {
+        long nowMs = System.currentTimeMillis();
+        ensureLocationUpdates(settings);
+
+        Integer soc = vehicle.getSocPercent() == null ? null : Math.round(vehicle.getSocPercent());
+        Float powerKw = vehicle.getBatteryPowerKw();
+        Boolean parked = vehicle.getParked();
+        // The charge port property need not be implemented; ChargingSignal falls back to the
+        // charge rate and the park state, exactly as the removed ABRP uploader did.
+        Boolean charging = chargingSignal.evaluate(
+                nowMs, vehicle.getChargePortConnected(), powerKw == null ? null : -powerKw, parked, soc);
+        Boolean dcfc = charging == null || powerKw == null ? null
+                : charging && ChargingState.isDcCharging(vehicle.getChargingStatus(),
+                        vehicle.getChargePortConnected(), powerKw, vehicle.getSpeedKmh());
+
+        boolean stateChanged = !Objects.equals(parked, lastParked) || !Objects.equals(charging, lastCharging);
+        lastParked = parked;
+        lastCharging = charging;
+
+        boolean idle = Boolean.TRUE.equals(parked) && Boolean.FALSE.equals(charging);
+        boolean uploadDue = UploadCadence.shouldUpload(
+                nowMs, lastUploadAttemptMs, parked, charging, soc, stateChanged, settings);
+        if (!idle || uploadDue) {
+            queue.add(buildSample(nowMs, vehicle, session, settings, soc, charging, dcfc, parked));
+        }
+        if (!uploadDue) return;
+        // Cadence counts attempts, not successes: retrying every tick while offline would
+        // spend power exactly when it buys nothing.
+        lastUploadAttemptMs = nowMs;
+        flush();
+    }
+
+    int queued() { return queue.size(); }
+
+    // ---------- Sample ----------
+
+    private String buildSample(long nowMs, EnergySnapshot vehicle, ChargeSessionTracker.Snapshot session,
+                               UploadSettings settings, Integer soc, Boolean charging, Boolean dcfc, Boolean parked) {
+        TelemetryPayload tlm = new TelemetryPayload(nowMs / 1000);
+        tlm.soc = soc;
+        tlm.speedKmh = vehicle.getSpeedKmh();
+        tlm.rangeKm = vehicle.getRangeKm() == null ? null : Math.round(vehicle.getRangeKm());
+        tlm.powerKw = vehicle.getBatteryPowerKw();
+        tlm.charging = charging;
+        tlm.dcfc = dcfc;
+        tlm.parked = parked;
+        tlm.cabinTemp = vehicle.getCabinTempCelsius();
+        tlm.battTempC = vehicle.getBatteryTempCelsius();
+        tlm.extTempC = vehicle.getOutsideTempCelsius();
+        tlm.capacityKwh = vehicle.getBatteryCapacityKwh();
+        tlm.soeKwh = vehicle.getBatteryEnergyKwh();
+        tlm.odometerKm = vehicle.getOdometerKm();
+        tlm.hvacSetpointC = vehicle.getClimate().getDriverTargetCelsius();
+        tlm.voltageV = vehicle.getBatteryVoltageV();
+        tlm.currentA = vehicle.getBatteryCurrentA();
+        // Only DC charges are metered, so only those carry an energy figure.
+        if (Boolean.TRUE.equals(dcfc) && session != null && session.charging) tlm.kwhCharged = session.energyKwh;
+        TirePressureSnapshot tires = vehicle.getTirePressures();
+        tlm.tirePressureFlKpa = tires.getFrontLeftKpa();
+        tlm.tirePressureFrKpa = tires.getFrontRightKpa();
+        tlm.tirePressureRlKpa = tires.getRearLeftKpa();
+        tlm.tirePressureRrKpa = tires.getRearRightKpa();
+        Location loc = freshLocation(settings);
+        if (loc != null) {
+            tlm.lat = loc.getLatitude();
+            tlm.lon = loc.getLongitude();
+            tlm.elevation = loc.hasAltitude() ? loc.getAltitude() : null;
+            tlm.heading = loc.hasBearing() ? loc.getBearing() : null;
+        }
+        return tlm.build();
+    }
+
+    // ---------- Upload ----------
+
+    private void flush() {
+        ServerConfig config = ServerConfig.get(context);
+        if (!config.isConfigured()) {
+            Log.i(TAG, "Telemetry not sent: server not configured (" + queue.size() + " queued)");
+            return;
+        }
+        for (int i = 0; i < MAX_BATCHES_PER_TICK && queue.size() > 0; i++) {
+            List<String> batch = queue.peekBatch();
+            String summary = TelemetryPayload.summarize(batch.get(batch.size() - 1));
+            try {
+                int status = post(config, batch);
+                boolean ok = status >= 200 && status < 300;
+                AbrpUploadService.log().record(new UploadLog.Entry(System.currentTimeMillis(), status, ok,
+                        ok ? "Telemetry: " + batch.size() + " sample(s) sent"
+                           : "Telemetry rejected (" + batch.size() + " queued)", summary));
+                if (!ok) {
+                    // A 400 will never succeed on retry: drop the batch rather than block the
+                    // queue behind it forever. Anything else (401, 5xx) is kept for later.
+                    if (status == 400) queue.remove(batch.size());
+                    return;
+                }
+                queue.remove(batch.size());
+            } catch (Exception e) {
+                AbrpUploadService.log().record(new UploadLog.Entry(System.currentTimeMillis(), 0, false,
+                        "Telemetry offline — " + queue.size() + " queued: " + e.getClass().getSimpleName(),
+                        summary));
+                return;
+            }
+        }
+    }
+
+    private int post(ServerConfig config, List<String> batch) throws Exception {
+        JSONArray samples = new JSONArray();
+        for (String sample : batch) samples.put(new JSONObject(sample));
+        byte[] body = new JSONObject()
+                .put("installationId", config.installationId)
+                .put("samples", samples)
+                .toString().getBytes(StandardCharsets.UTF_8);
+        HttpURLConnection connection = null;
+        try {
+            connection = (HttpURLConnection) new URL(config.url + "/v1/telemetry").openConnection();
+            connection.setRequestMethod("POST");
+            connection.setConnectTimeout(TIMEOUT_MS);
+            connection.setReadTimeout(TIMEOUT_MS);
+            connection.setDoOutput(true);
+            connection.setFixedLengthStreamingMode(body.length);
+            connection.setRequestProperty("Content-Type", "application/json");
+            // The token goes in a header, never the URL, and is never logged.
+            connection.setRequestProperty("Authorization", "Bearer " + config.token);
+            try (OutputStream out = connection.getOutputStream()) { out.write(body); }
+            return connection.getResponseCode();
+        } finally {
+            if (connection != null) connection.disconnect();
+        }
+    }
+
+    // ---------- Location ----------
+
+    private final LocationListener locationListener = new LocationListener() {
+        @Override public void onLocationChanged(Location location) { lastLocation = location; }
+        @Override public void onStatusChanged(String provider, int status, Bundle extras) { }
+        @Override public void onProviderEnabled(String provider) { locationActive = false; }
+        @Override public void onProviderDisabled(String provider) {
+            // A stale fix is worse than none: it would put the car back where it was.
+            lastLocation = null;
+            locationActive = false;
+        }
+    };
+
+    /** Subscribes to GPS once, and again after a failure or a provider change. */
+    private void ensureLocationUpdates(UploadSettings settings) {
+        if (locationActive) return;
+        long now = SystemClock.elapsedRealtime();
+        if (lastLocationRequestMs != 0L && now - lastLocationRequestMs < LOCATION_RETRY_MS) return;
+        lastLocationRequestMs = now;
+        new android.os.Handler(Looper.getMainLooper()).post(() -> requestLocationUpdates(settings));
+    }
+
+    private void requestLocationUpdates(UploadSettings settings) {
+        try {
+            if (locationManager == null) {
+                locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
+            }
+            try { locationManager.removeUpdates(locationListener); } catch (Exception ignored) { }
+            if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
+                Log.w(TAG, "GPS provider disabled — position omitted, will retry");
+                return;
+            }
+            // Matched to the upload interval: fixes between uploads would only be thrown away.
+            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
+                    Math.min(settings.intervalMs(), 15_000L), 0f, locationListener, Looper.getMainLooper());
+            locationActive = true;
+            Location last = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
+            if (last != null && locationAgeMs(last) <= MIN_LOCATION_MAX_AGE_MS) lastLocation = last;
+        } catch (SecurityException e) {
+            Log.w(TAG, "Location permission not granted: " + e.getMessage());
+        } catch (Exception e) {
+            Log.w(TAG, "Location unavailable: " + e.getMessage());
+        }
+    }
+
+    void stop() {
+        try {
+            if (locationManager != null) locationManager.removeUpdates(locationListener);
+        } catch (Exception ignored) { }
+        locationActive = false;
+    }
+
+    private Location freshLocation(UploadSettings settings) {
+        Location loc = lastLocation;
+        if (loc == null) return null;
+        long maxAge = Math.max(MIN_LOCATION_MAX_AGE_MS, 3 * settings.intervalMs());
+        return locationAgeMs(loc) <= maxAge ? loc : null;
+    }
+
+    /**
+     * Age on the monotonic clock: the head unit sets its wall clock from GPS, so a fix's
+     * wall-clock time can jump. A provider that does not stamp the monotonic clock leaves 0;
+     * such a fix counts as fresh rather than blanking the position for good.
+     */
+    private static long locationAgeMs(Location loc) {
+        long fixNanos = loc.getElapsedRealtimeNanos();
+        if (fixNanos <= 0L) return 0L;
+        return Math.max(0L, (SystemClock.elapsedRealtimeNanos() - fixNanos) / 1_000_000L);
+    }
+}
diff --git a/app/src/main/java/com/evsuite/abrp/UploadCadence.java b/app/src/main/java/com/evsuite/abrp/UploadCadence.java
new file mode 100644
index 0000000..4cf5737
--- /dev/null
+++ b/app/src/main/java/com/evsuite/abrp/UploadCadence.java
@@ -0,0 +1,66 @@
+package com.evsuite.abrp;
+
+/**
+ * Decides whether a given scheduler tick should actually upload.
+ *
+ * The service ticks at a fixed short rate; this class thins the uploads out. A car parked
+ * overnight and not charging does not need a sample every minute — that is wasted data and
+ * power — but nothing may be lost while driving or charging, where ABRP needs the
+ * resolution to keep a route plan accurate.
+ *
+ * Free of Android types so the policy can be unit-tested directly.
+ */
+final class UploadCadence {
+
+    /**
+     * Parked and not charging: one keep-alive sample every 15 minutes. The car is not
+     * moving and its SOC is not changing, so anything more is spent for nothing.
+     */
+    static final long PARKED_INTERVAL_MS = 900_000L;
+
+    private UploadCadence() { }
+
+    /**
+     * @param nowMs         current time
+     * @param lastUploadMs  when the last upload was attempted, 0 if never
+     * @param parked        null when the gear could not be read
+     * @param charging      null when the charge port state could not be read
+     * @param socPercent    null when the battery level could not be read
+     * @param stateChanged  true if parked/charging differ from the previous tick
+     * @param settings      user-configured cadence
+     */
+    static boolean shouldUpload(long nowMs, long lastUploadMs,
+                                Boolean parked, Boolean charging, Integer socPercent,
+                                boolean stateChanged, UploadSettings settings) {
+        // Never uploaded yet: send immediately so ABRP sees the car come online.
+        if (lastUploadMs <= 0L) return true;
+
+        // A transition (just parked, plugged in, unplugged) is exactly what ABRP must
+        // learn straight away — never make it wait for the slow interval.
+        if (stateChanged) return true;
+
+        return nowMs - lastUploadMs >= intervalFor(parked, charging, socPercent, settings);
+    }
+
+    /**
+     * Interval that applies in the given state.
+     *
+     * Unknown state counts as active: if the gear or charge port could not be read we do
+     * not know the car is idle, and under-reporting a moving car is worse than a few
+     * extra requests from a stationary one.
+     */
+    static long intervalFor(Boolean parked, Boolean charging, Integer socPercent,
+                            UploadSettings settings) {
+        boolean idle = Boolean.TRUE.equals(parked) && Boolean.FALSE.equals(charging);
+        if (idle) return PARKED_INTERVAL_MS;
+
+        // Low battery: the driver is picking a charge stop and ABRP needs a tighter SOC
+        // curve to get the arrival estimate right. Only while actually in use — a car
+        // parked at 5 % is still parked and gains nothing from fast polling.
+        if (settings.boostLowSoc && socPercent != null
+                && socPercent <= settings.lowSocPercent) {
+            return Math.min(settings.intervalMs(), UploadSettings.BOOSTED_INTERVAL_SEC * 1000L);
+        }
+        return settings.intervalMs();
+    }
+}
diff --git a/app/src/main/java/com/evsuite/abrp/UploadSettings.java b/app/src/main/java/com/evsuite/abrp/UploadSettings.java
index a6f7607..a30ec5a 100644
--- a/app/src/main/java/com/evsuite/abrp/UploadSettings.java
+++ b/app/src/main/java/com/evsuite/abrp/UploadSettings.java
@@ -1,14 +1,79 @@
 package com.evsuite.abrp;
 
+import android.content.SharedPreferences;
+
 /**
- * Placeholder — the service is always-on and samples on a fixed 15-second scheduler, so
- * there is no user-configurable upload policy left. Kept as an empty shell so any stray
- * references compile during the ABRP removal; will be deleted once all callers are gone.
+ * User-configurable upload policy.
+ *
+ * Defaults are deliberately conservative. The head unit is awake whenever the car is on,
+ * and both the upload tick and the GPS subscription cost power the whole time, so the
+ * default cadence is the slowest one that still keeps an ABRP route plan usable.
  */
 final class UploadSettings {
 
-    static final String KEY_AUTOSTART = "autostart";
-    static final boolean DEFAULT_AUTOSTART = true;
+    static final String KEY_INTERVAL_SEC    = "upload_interval_sec";
+    static final String KEY_BOOST_LOW_SOC   = "boost_low_soc";
+    static final String KEY_LOW_SOC_PERCENT = "low_soc_percent";
+    static final String KEY_AUTOSTART       = "autostart";
+    static final String KEY_ABRP_UPLOAD_ENABLED = "abrp_upload_enabled";
 
-    private UploadSettings() { }
+    /**
+     * On by default: an ABRP plan is only useful if it is fed from the moment the drive
+     * starts, and nobody opens this app before setting off. Kept as a switch because a
+     * service that starts itself must also be switchable off.
+     */
+    static final boolean DEFAULT_AUTOSTART = true;
+    static final boolean DEFAULT_ABRP_UPLOAD_ENABLED = true;
+
+    /**
+     * Default cadence while driving. 60 s is roughly 1.5 km between points at motorway
+     * speed, which ABRP can still track; going much slower makes the live plan lag
+     * reality. Parked and idle backs off far further on its own — see UploadCadence.
+     */
+    static final int DEFAULT_INTERVAL_SEC = 60;
+
+    /** Offered in the UI. Kept short so the list stays a single glance on a car screen. */
+    static final int[] INTERVAL_CHOICES_SEC = { 15, 30, 60, 120, 300 };
+
+    static final boolean DEFAULT_BOOST_LOW_SOC = true;
+
+    /** Below this, range planning gets tight and ABRP needs a finer SOC curve. */
+    static final int DEFAULT_LOW_SOC_PERCENT = 20;
+
+    /** Cadence used while SOC is low and the boost is enabled. */
+    static final int BOOSTED_INTERVAL_SEC = 15;
+
+    final int intervalSec;
+    final boolean boostLowSoc;
+    final int lowSocPercent;
+    final boolean abrpUploadEnabled;
+
+    UploadSettings(int intervalSec, boolean boostLowSoc, int lowSocPercent) {
+        this(intervalSec, boostLowSoc, lowSocPercent, DEFAULT_ABRP_UPLOAD_ENABLED);
+    }
+
+    UploadSettings(int intervalSec, boolean boostLowSoc, int lowSocPercent,
+                   boolean abrpUploadEnabled) {
+        this.intervalSec = intervalSec;
+        this.boostLowSoc = boostLowSoc;
+        this.lowSocPercent = lowSocPercent;
+        this.abrpUploadEnabled = abrpUploadEnabled;
+    }
+
+    static UploadSettings from(SharedPreferences prefs) {
+        return new UploadSettings(
+                prefs.getInt(KEY_INTERVAL_SEC, DEFAULT_INTERVAL_SEC),
+                prefs.getBoolean(KEY_BOOST_LOW_SOC, DEFAULT_BOOST_LOW_SOC),
+                prefs.getInt(KEY_LOW_SOC_PERCENT, DEFAULT_LOW_SOC_PERCENT),
+                prefs.getBoolean(KEY_ABRP_UPLOAD_ENABLED, DEFAULT_ABRP_UPLOAD_ENABLED));
+    }
+
+    static UploadSettings defaults() {
+        return new UploadSettings(
+                DEFAULT_INTERVAL_SEC, DEFAULT_BOOST_LOW_SOC, DEFAULT_LOW_SOC_PERCENT);
+    }
+
+    long intervalMs() {
+        return intervalSec * 1000L;
+    }
 }
diff --git a/app/src/main/res/drawable/ic_tab_server.xml b/app/src/main/res/drawable/ic_tab_server.xml
new file mode 100644
index 0000000..3f45ef0
--- /dev/null
+++ b/app/src/main/res/drawable/ic_tab_server.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Arrow into a tray: the Server tab (where the telemetry goes). Tinted by
+     @color/nav_tab_foreground. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:strokeColor="#FFFFFFFF"
+        android:strokeWidth="2"
+        android:strokeLineCap="round"
+        android:strokeLineJoin="round"
+        android:fillColor="#00000000"
+        android:pathData="M4,14V19H20V14" />
+    <path
+        android:strokeColor="#FFFFFFFF"
+        android:strokeWidth="2"
+        android:strokeLineCap="round"
+        android:strokeLineJoin="round"
+        android:fillColor="#00000000"
+        android:pathData="M12,3V13M8,7L12,3L16,7" />
+</vector>
diff --git a/app/src/main/res/layout-w1000dp/activity_main.xml b/app/src/main/res/layout-w1000dp/activity_main.xml
index c1cae25..bd06d3b 100644
--- a/app/src/main/res/layout-w1000dp/activity_main.xml
+++ b/app/src/main/res/layout-w1000dp/activity_main.xml
@@ -10,6 +10,7 @@
                 <com.google.android.material.button.MaterialButton android:id="@+id/tabConsumption" style="@style/Widget.EV.NavTab" android:layout_width="match_parent" android:layout_height="64dp" android:layout_marginBottom="6dp" android:text="@string/tab_consumption" app:icon="@drawable/ic_tab_vehicle" />
                 <com.google.android.material.button.MaterialButton android:id="@+id/tabCharging" style="@style/Widget.EV.NavTab" android:layout_width="match_parent" android:layout_height="64dp" android:layout_marginBottom="6dp" android:text="@string/tab_charging" app:icon="@drawable/ic_tab_service" />
                 <com.google.android.material.button.MaterialButton android:id="@+id/tabService" style="@style/Widget.EV.NavTab" android:layout_width="match_parent" android:layout_height="64dp" android:layout_marginBottom="6dp" android:text="@string/tab_service" app:icon="@drawable/ic_tab_service" />
+                <com.google.android.material.button.MaterialButton android:id="@+id/tabServer" style="@style/Widget.EV.NavTab" android:layout_width="match_parent" android:layout_height="64dp" android:layout_marginBottom="6dp" android:text="@string/tab_server" app:icon="@drawable/ic_tab_server" />
                 <com.google.android.material.button.MaterialButton android:id="@+id/tabWifi" style="@style/Widget.EV.NavTab" android:layout_width="match_parent" android:layout_height="64dp" android:layout_marginBottom="6dp" android:text="@string/tab_wifi" app:icon="@drawable/ic_tab_wifi" />
                 <com.google.android.material.button.MaterialButton android:id="@+id/tabLog" style="@style/Widget.EV.NavTab" android:layout_width="match_parent" android:layout_height="64dp" android:layout_marginBottom="6dp" android:text="@string/tab_log" app:icon="@drawable/ic_tab_log" />
             </LinearLayout>
diff --git a/app/src/main/res/layout-w1000dp/pane_service.xml b/app/src/main/res/layout-w1000dp/pane_service.xml
index 9eced4d..0d904ea 100644
--- a/app/src/main/res/layout-w1000dp/pane_service.xml
+++ b/app/src/main/res/layout-w1000dp/pane_service.xml
@@ -3,12 +3,9 @@
     <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:padding="24dp" android:baselineAligned="false">
         <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" android:layout_marginEnd="16dp" android:padding="24dp" android:background="@drawable/bg_glass">
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/design_service_controls" android:textAppearance="@style/Text.EV.Eyebrow" />
-            <TextView android:id="@+id/status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/bg_input_panel" android:padding="16dp" android:layout_marginTop="20dp" android:layout_marginBottom="12dp" android:text="@string/status_stopped" android:textAppearance="@style/Text.EV.Body" />
-            <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/service_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_upload_enabled" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
+            <TextView android:id="@+id/status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/bg_input_panel" android:padding="16dp" android:layout_marginTop="20dp" android:layout_marginBottom="12dp" android:text="@string/state_stopped" android:textAppearance="@style/Text.EV.Body" />
             <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/abrp_upload_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Secondary" />
-            <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/autostart_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_autostart" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
-            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_autostart" android:textAppearance="@style/Text.EV.Secondary" />
         </LinearLayout>
         <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" android:padding="24dp" android:background="@drawable/bg_glass">
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/design_service_timing" android:textAppearance="@style/Text.EV.Eyebrow" />
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 4a92f4f..a0ea4c8 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -17,6 +17,7 @@
       <com.google.android.material.button.MaterialButton android:id="@+id/tabConsumption" style="@style/Widget.EV.NavTab.Compact" android:layout_width="0dp" android:layout_height="76dp" android:layout_weight="1" android:text="@string/tab_consumption" app:icon="@drawable/ic_tab_vehicle"/>
       <com.google.android.material.button.MaterialButton android:id="@+id/tabCharging" style="@style/Widget.EV.NavTab.Compact" android:layout_width="0dp" android:layout_height="76dp" android:layout_weight="1" android:text="@string/tab_charging" app:icon="@drawable/ic_tab_service"/>
       <com.google.android.material.button.MaterialButton android:id="@+id/tabService" style="@style/Widget.EV.NavTab.Compact" android:layout_width="0dp" android:layout_height="76dp" android:layout_weight="1" android:text="@string/tab_service" app:icon="@drawable/ic_tab_service"/>
+      <com.google.android.material.button.MaterialButton android:id="@+id/tabServer" style="@style/Widget.EV.NavTab.Compact" android:layout_width="0dp" android:layout_height="76dp" android:layout_weight="1" android:text="@string/tab_server" app:icon="@drawable/ic_tab_server"/>
       <com.google.android.material.button.MaterialButton android:id="@+id/tabWifi" style="@style/Widget.EV.NavTab.Compact" android:layout_width="0dp" android:layout_height="76dp" android:layout_weight="1" android:text="@string/tab_wifi" app:icon="@drawable/ic_tab_wifi"/>
       <com.google.android.material.button.MaterialButton android:id="@+id/tabLog" style="@style/Widget.EV.NavTab.Compact" android:layout_width="0dp" android:layout_height="76dp" android:layout_weight="1" android:text="@string/tab_log" app:icon="@drawable/ic_tab_log"/>
     </LinearLayout>
diff --git a/app/src/main/res/layout/pane_server.xml b/app/src/main/res/layout/pane_server.xml
new file mode 100644
index 0000000..455efa2
--- /dev/null
+++ b/app/src/main/res/layout/pane_server.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" android:clipToPadding="false">
+    <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp">
+        <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp" android:background="@drawable/bg_glass">
+            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/server_card_title" android:textAppearance="@style/Text.EV.Eyebrow" />
+            <com.google.android.material.textfield.TextInputLayout android:id="@+id/server_url_layout" style="@style/Widget.EV.Input" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:hint="@string/hint_server_url" app:helperText="@string/helper_server_url">
+                <com.google.android.material.textfield.TextInputEditText android:id="@+id/server_url_input" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:inputType="textUri" android:singleLine="true" android:textSize="20sp" />
+            </com.google.android.material.textfield.TextInputLayout>
+            <com.google.android.material.textfield.TextInputLayout android:id="@+id/server_token_layout" style="@style/Widget.EV.Input" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:hint="@string/hint_server_token" app:endIconMode="password_toggle" app:endIconMinSize="72dp" app:helperText="@string/helper_server_token">
+                <com.google.android.material.textfield.TextInputEditText android:id="@+id/server_token_input" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:inputType="textPassword" android:singleLine="true" android:textSize="20sp" />
+            </com.google.android.material.textfield.TextInputLayout>
+            <com.google.android.material.textfield.TextInputLayout android:id="@+id/installation_id_layout" style="@style/Widget.EV.Input" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:hint="@string/hint_installation_id" app:helperText="@string/helper_installation_id">
+                <com.google.android.material.textfield.TextInputEditText android:id="@+id/installation_id_input" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:inputType="text" android:singleLine="true" android:textSize="18sp" android:fontFamily="monospace" />
+            </com.google.android.material.textfield.TextInputLayout>
+            <com.google.android.material.button.MaterialButton android:id="@+id/server_save_button" style="@style/Widget.EV.Button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/btn_save" android:layout_marginTop="20dp" />
+            <com.google.android.material.button.MaterialButton android:id="@+id/server_test_button" style="@style/Widget.EV.Button.Outlined" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/btn_test" android:layout_marginTop="8dp" />
+            <LinearLayout android:id="@+id/connection_status_row" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:gravity="center_vertical" android:orientation="horizontal" android:visibility="gone">
+                <View android:id="@+id/connection_indicator" android:layout_width="10dp" android:layout_height="10dp" android:layout_marginEnd="12dp" android:background="@drawable/circle_indicator" />
+                <TextView android:id="@+id/connection_status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="@style/Text.EV.Body" />
+            </LinearLayout>
+        </LinearLayout>
+        <Space android:layout_width="1dp" android:layout_height="20dp" />
+        <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp" android:background="@drawable/bg_glass">
+            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/design_private_title" android:textAppearance="@style/Text.EV.Title" />
+            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/design_private_body" android:textAppearance="@style/Text.EV.Secondary" android:layout_marginTop="16dp" android:lineSpacingMultiplier="1.3" />
+            <com.google.android.material.button.MaterialButton android:id="@+id/import_button" style="@style/Widget.EV.Button.Outlined" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/btn_import" android:layout_marginTop="24dp" />
+            <TextView android:id="@+id/import_hint" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="12dp" android:textAppearance="@style/Text.EV.Secondary" android:textIsSelectable="true" />
+        </LinearLayout>
+    </LinearLayout>
+</ScrollView>
diff --git a/app/src/main/res/layout/pane_service.xml b/app/src/main/res/layout/pane_service.xml
index 9d8557f..cfdda55 100644
--- a/app/src/main/res/layout/pane_service.xml
+++ b/app/src/main/res/layout/pane_service.xml
@@ -3,12 +3,9 @@
     <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp">
         <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp" android:background="@drawable/bg_glass">
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/design_service_controls" android:textAppearance="@style/Text.EV.Eyebrow" />
-            <TextView android:id="@+id/status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/bg_input_panel" android:padding="16dp" android:layout_marginTop="20dp" android:layout_marginBottom="12dp" android:text="@string/status_stopped" android:textAppearance="@style/Text.EV.Body" />
-            <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/service_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_upload_enabled" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
+            <TextView android:id="@+id/status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/bg_input_panel" android:padding="16dp" android:layout_marginTop="20dp" android:layout_marginBottom="12dp" android:text="@string/state_stopped" android:textAppearance="@style/Text.EV.Body" />
             <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/abrp_upload_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Secondary" />
-            <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/autostart_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_autostart" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
-            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_autostart" android:textAppearance="@style/Text.EV.Secondary" />
         </LinearLayout>
         <Space android:layout_width="1dp" android:layout_height="20dp" />
         <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="24dp" android:background="@drawable/bg_glass">
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 341259d..ef89248 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -2,7 +2,6 @@
     <string name="app_name">Nils\' MG4</string>
 
     <!-- Main screen -->
-    <string name="tab_abrp">ABRP</string>
     <string name="tab_service">Upload</string>
     <string name="tab_vehicle">Overview</string>
     <string name="tab_consumption">Consumption</string>
@@ -11,6 +10,7 @@
     <string name="consumption_subtitle">Since start, motor, lifetime and trip counters</string>
     <string name="charging_title">Charging</string>
     <string name="charging_subtitle">Live battery values and SOC/power curve</string>
+    <string name="tab_server">Server</string>
     <string name="tab_wifi">Wi-Fi</string>
     <string name="tab_log">Logs</string>
 
@@ -42,45 +42,45 @@
     <string name="vehicle_tire_fr">Front Right</string>
     <string name="vehicle_tire_rl">Rear Left</string>
     <string name="vehicle_tire_rr">Rear Right</string>
-    <string name="card_config">Configuration</string>
-    <string name="hint_api_key">ABRP API Key</string>
-    <string name="default_abrp_api_key" translatable="false">8cfc314b-03cd-4efe-ab7d-4431cd8f2e2d</string>
-    <string name="helper_api_key">Default: open-source ABRP telemetry key. You may replace it with your own.</string>
-    <string name="api_key_required">Enter your ABRP API key first</string>
-    <string name="hint_token">ABRP User Token</string>
-    <string name="helper_token">Find your token in the ABRP app: Settings → Connections → Generic (Manual Entry)</string>
-    <string name="desc_toggle_api_key">Show or hide API key</string>
-    <string name="desc_toggle_token">Show or hide user token</string>
     <string name="btn_save">Save</string>
     <string name="btn_test">Test connection</string>
     <string name="btn_import">Import from file</string>
 
+    <!-- Server page -->
+    <string name="server_card_title">Car server</string>
+    <string name="hint_server_url">Server URL</string>
+    <string name="helper_server_url">For example https://car.stinnesbeck.com</string>
+    <string name="hint_server_token">Ingest token</string>
+    <string name="helper_server_token">The server\'s INGEST_TOKEN, at least 24 characters</string>
+    <string name="hint_installation_id">Installation ID</string>
+    <string name="helper_installation_id">Your data is stored under this ID. Keep it when reinstalling.</string>
+    <string name="server_err_url">Enter an https:// URL</string>
+    <string name="server_err_token">The token must be at least 24 characters, without spaces</string>
+    <string name="server_err_installation_id">Not a valid ID (UUID)</string>
+    <string name="server_saved">Server settings saved</string>
+    <string name="server_not_configured">Server not configured — open the Server tab</string>
+    <string name="import_hint">Put a text file with server_url and token in %1$s (on the head unit or a USB stick in the same folder), then press Import.</string>
+
     <!-- Config file import -->
-    <string name="import_ok">Config imported — press Test to verify</string>
+    <string name="import_ok">Config imported and saved — press Test to verify</string>
     <string name="import_err_read">Could not read that file</string>
-    <string name="import_err_empty">No ABRP settings found in that file</string>
+    <string name="import_err_empty">No settings found in that file</string>
     <string name="import_err_not_found">No config file found. Copy it to %1$s</string>
 
     <!-- Connection test -->
     <string name="conn_testing">Testing…</string>
-    <string name="conn_ok">Connected — API responding OK</string>
-    <string name="conn_err_auth">Auth failed — check your API key and token</string>
+    <string name="conn_ok">Connected — server accepts the token</string>
+    <string name="conn_err_auth">Token rejected — check it against the server\'s INGEST_TOKEN</string>
     <string name="perm_denied_location">Location denied — telemetry will have no position. Grant it in Settings to send GPS to ABRP.</string>
     <string name="perm_denied_car">Vehicle data denied — no battery %%, speed or range will be sent. Grant it in Settings.</string>
     <string name="perm_denied_all">Location and vehicle data denied — only a timestamp will be sent. Grant both in Settings.</string>
     <string name="conn_err_no_internet">No internet connection</string>
     <string name="conn_err_timeout">Connection timed out</string>
     <string name="conn_err_http">Server error (HTTP %1$d)</string>
-    <string name="token_required">Enter your ABRP token first</string>
 
-    <string name="card_service">Upload Service</string>
-    <string name="label_upload_enabled">Enable background telemetry</string>
-    <string name="label_abrp_upload_enabled">Upload telemetry to ABRP</string>
-    <string name="hint_abrp_upload_enabled">Turn this off when DiPlay sends ABRP data. Local consumption tracking and background telemetry keep running.</string>
-    <string name="label_autostart">Start automatically with the car</string>
-    <string name="hint_autostart">Uploading resumes on its own when the head unit powers up. Turn this off to start it by hand from this screen.</string>
+    <string name="label_abrp_upload_enabled">Send live telemetry to the server</string>
+    <string name="hint_abrp_upload_enabled">The server stores it and forwards it to ABRP. Turn this off when another app feeds ABRP; consumption and charging tracking keep running.</string>
 
-    <string name="status_stopped">Service not running</string>
 
     <!-- Cadence configuration -->
     <string name="label_frequency">Upload frequency</string>
@@ -100,8 +100,8 @@
     <string name="state_stopped">Stopped</string>
     <string name="state_starting">Starting…</string>
     <string name="state_running">Running</string>
-    <string name="state_tracking_locally">Tracking locally — ABRP upload off</string>
-    <string name="notif_tracking_locally">Tracking locally — ABRP upload off</string>
+    <string name="state_tracking_locally">Tracking locally — live telemetry off</string>
+    <string name="notif_tracking_locally">Tracking locally — live telemetry off</string>
     <string name="state_error">In error — last %1$d uploads failed</string>
 
     <!-- Call log -->
diff --git a/app/src/main/res/values/strings_design.xml b/app/src/main/res/values/strings_design.xml
index 8cce1d3..dbadaea 100644
--- a/app/src/main/res/values/strings_design.xml
+++ b/app/src/main/res/values/strings_design.xml
@@ -7,8 +7,8 @@
   <string name="design_brand_footer">ON THE ROAD, ELECTRIC</string>
   <string name="design_overview_title">Your drive at a glance.</string>
   <string name="design_overview_subtitle">Data from your car, all in one place.</string>
-  <string name="design_abrp_title">Connect to your route.</string>
-  <string name="design_abrp_subtitle">Link your car with your ABRP account.</string>
+  <string name="design_server_title">Where your data goes.</string>
+  <string name="design_server_subtitle">Your own server stores it and passes it on to ABRP.</string>
   <string name="design_service_title">You focus on the road.</string>
   <string name="design_service_subtitle">Your data stays up to date in the background.</string>
   <string name="design_wifi_title">Stay connected.</string>
@@ -18,9 +18,9 @@
   <string name="design_battery">BATTERY</string>
   <string name="design_energy">ENERGY AND TEMPERATURE</string>
   <string name="design_tires">TIRE PRESSURES</string>
-  <string name="design_account">ACCOUNT LINK</string>
+  <string name="design_account">SERVER LINK</string>
   <string name="design_private_title">Your private connection.</string>
-  <string name="design_private_body">The token links your car to your ABRP account. Your credentials are stored encrypted on this device.</string>
+  <string name="design_private_body">The token lets the car write to your server. It is stored encrypted on this device; your ABRP credentials stay on the server.</string>
   <string name="design_no_data">Values that cannot be read are shown as &#x2014;.</string>
   <string name="design_service_controls">UPLOAD CONTROL</string>
   <string name="design_service_timing">UPDATE FREQUENCY</string>
diff --git a/app/src/test/java/com/evsuite/abrp/AbrpApiTest.java b/app/src/test/java/com/evsuite/abrp/AbrpApiTest.java
deleted file mode 100644
index 6852511..0000000
--- a/app/src/test/java/com/evsuite/abrp/AbrpApiTest.java
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.evsuite.abrp;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-
-import org.junit.Test;
-
-/**
- * [T-912] Credentials must reach ABRP in the request body. A URL is logged by
- * proxies, CDNs and crash reporters; a body is not.
- */
-public class AbrpApiTest {
-
-    @Test
-    public void endpointUrlCarriesNoCredentials() {
-        assertFalse(AbrpApi.API_URL.contains("?"));
-        assertFalse(AbrpApi.API_URL.contains("api_key"));
-        assertFalse(AbrpApi.API_URL.contains("token"));
-    }
-
-    @Test
-    public void endpointIsHttps() {
-        assertTrue(AbrpApi.API_URL.startsWith("https://"));
-        assertTrue(AbrpApi.VERIFY_URL.startsWith("https://"));
-    }
-
-    /** [T-913] The Test button must not be able to write telemetry. */
-    @Test
-    public void credentialCheckDoesNotTargetTheTelemetryWriteEndpoint() {
-        assertFalse("le test de connexion ne doit jamais viser /tlm/send",
-                AbrpApi.VERIFY_URL.contains("/tlm/send"));
-        assertTrue(AbrpApi.VERIFY_URL.contains("get_next_charge"));
-    }
-
-    @Test
-    public void bodyCarriesAllThreeParameters() throws Exception {
-        String body = AbrpApi.formBody("KEY", "TOK", "{\"utc\":1}");
-        assertTrue(body.contains("api_key=KEY"));
-        assertTrue(body.contains("token=TOK"));
-        assertTrue(body.contains("tlm="));
-    }
-
-    @Test
-    public void bodyIsFormEncoded() throws Exception {
-        // A token with URL-significant characters must not break the body layout.
-        String body = AbrpApi.formBody("a+b/c", "d&e=f", "{\"utc\":1}");
-        assertEquals("api_key=a%2Bb%2Fc&token=d%26e%3Df&tlm=%7B%22utc%22%3A1%7D", body);
-    }
-}
diff --git a/app/src/test/java/com/evsuite/abrp/ConfigImportTest.java b/app/src/test/java/com/evsuite/abrp/ConfigImportTest.java
index 61dff8f..bde9e65 100644
--- a/app/src/test/java/com/evsuite/abrp/ConfigImportTest.java
+++ b/app/src/test/java/com/evsuite/abrp/ConfigImportTest.java
@@ -8,34 +8,37 @@ import static org.junit.Assert.assertTrue;
 import org.junit.Test;
 
 /**
- * ABRP config file parsing — pure JVM, no Android needed.
+ * Config file parsing — pure JVM, no Android needed.
  *
- * The file exists so a user does not have to type a long api_key and token on the car's
+ * The file exists so a user does not have to type a long server URL and token on the car's
  * on-screen keyboard, so the parser must be forgiving about whitespace, case and comments
  * while never inventing a value the file did not set.
  */
 public class ConfigImportTest {
 
     @Test
-    public void parsesCredentials() {
-        ConfigImport c = ConfigImport.parse("api_key = abc123\ntoken = def456\n");
-        assertEquals("abc123", c.apiKey);
+    public void parsesServerSettings() {
+        ConfigImport c = ConfigImport.parse("server_url = https://car.example.com\ntoken = def456\n"
+                + "installation_id = 6f1a2b3c-4d5e-4f60-8a9b-0c1d2e3f4a5b\n");
+        assertEquals("https://car.example.com", c.serverUrl);
         assertEquals("def456", c.token);
+        assertEquals("6f1a2b3c-4d5e-4f60-8a9b-0c1d2e3f4a5b", c.installationId);
         assertFalse(c.isEmpty());
     }
 
     @Test
     public void ignoresCommentsBlankLinesAndCase() {
         ConfigImport c = ConfigImport.parse(
-                "# my config\n\n  API_KEY =  key  \n# token below\nTOKEN=tok\n");
-        assertEquals("key", c.apiKey);
+                "# my config\n\n  SERVER_URL =  https://x.example  \n# token below\nTOKEN=tok\n");
+        assertEquals("https://x.example", c.serverUrl);
         assertEquals("tok", c.token);
     }
 
     @Test
     public void absentKeysStayNullSoNothingIsWiped() {
         ConfigImport c = ConfigImport.parse("token = only-token\n");
-        assertNull(c.apiKey);
+        assertNull(c.serverUrl);
+        assertNull(c.installationId);
         assertEquals("only-token", c.token);
         assertNull(c.intervalSec);
         assertNull(c.boostLowSoc);
@@ -80,8 +83,8 @@ public class ConfigImportTest {
 
     @Test
     public void aliasKeysAreAccepted() {
-        ConfigImport c = ConfigImport.parse("apikey = k\nuser_token = t\n");
-        assertEquals("k", c.apiKey);
+        ConfigImport c = ConfigImport.parse("url = https://k.example\ningest_token = t\n");
+        assertEquals("https://k.example", c.serverUrl);
         assertEquals("t", c.token);
     }
 }
diff --git a/app/src/test/java/com/evsuite/abrp/HeadUnitWeatherTest.java b/app/src/test/java/com/evsuite/abrp/HeadUnitWeatherTest.java
deleted file mode 100644
index 2f8f45e..0000000
--- a/app/src/test/java/com/evsuite/abrp/HeadUnitWeatherTest.java
+++ /dev/null
@@ -1,109 +0,0 @@
-package com.evsuite.abrp;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
-
-import org.junit.Test;
-
-/**
- * The broadcast parser, on the JVM.
- *
- * What is under test is not the vendor's payload — that shape is unverified and may well be
- * something else on the car. It is that the parser finds a temperature wherever the payload
- * puts it, refuses to invent one, and says what it was given when it fails, because the
- * diagnostic is the only thing that reaches a driver with no adb.
- */
-public class HeadUnitWeatherTest {
-
-    @Test
-    public void readsATemperatureAndThePlaceItIsFor() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload((
-                "{\"code\":0,\"weather\":{\"temperature\":27,\"unit\":\"C\","
-                        + "\"address\":\"Toulouse\",\"conditionType\":1}}"));
-        assertEquals(27f, weather.temperatureC(), 0.01f);
-        assertEquals("Toulouse", weather.place());
-        // The diagnostic carries the reading's age: a broadcast arrives when the weather app
-        // refreshes, so "where from" without "how long ago" does not say whether to trust it.
-        assertEquals("Toulouse/0min", weather.diagnostic());
-    }
-
-    @Test
-    public void findsTheValueWhereverThePayloadNests_it() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload((
-                "{\"data\":{\"current\":[{\"tempValue\":\"18.5\",\"tempUnit\":\"C\"}]}}"));
-        assertEquals(18.5f, weather.temperatureC(), 0.01f);
-    }
-
-    @Test
-    public void convertsAFahrenheitPayload() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload(("{\"temperature\":81,\"temperatureUnit\":\"F\"}"));
-        assertEquals(27.2f, weather.temperatureC(), 0.1f);
-    }
-
-    @Test
-    public void anUnnamedUnitIsTakenAsCelsius() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload(("{\"temp\":21}"));
-        assertEquals(21f, weather.temperatureC(), 0.01f);
-    }
-
-    @Test
-    public void aPayloadWithoutATemperatureReportsWhatItWasGiven() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload(("{\"conditionType\":3,\"address\":\"Toulouse\"}"));
-        assertNull(weather.temperatureC());
-        assertTrue(weather.diagnostic(), weather.diagnostic().startsWith("no temperature in {"));
-        assertTrue(weather.diagnostic(), weather.diagnostic().contains("conditionType"));
-    }
-
-    @Test
-    public void readsThePlaceFromACityKeyToo() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload("{\"temp\":14,\"city\":\"Auzeville\"}");
-        assertEquals(14f, weather.temperatureC(), 0.01f);
-        assertEquals("Auzeville", weather.place());
-    }
-
-    @Test
-    public void aBroadcastWithNothingReadableIsReportedNotGuessed() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload(null);
-        assertNull(weather.temperatureC());
-        assertEquals("broadcast carried no JSON", weather.diagnostic());
-    }
-
-    @Test
-    public void beforeAnyBroadcastTheDiagnosticSaysSo() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        assertNull(weather.temperatureC());
-        assertEquals("no broadcast yet", weather.diagnostic());
-    }
-
-    @Test
-    public void malformedJsonDoesNotEscapeTheReceiver() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.acceptPayload(("{not json at all"));
-        assertNull(weather.temperatureC());
-        assertTrue(weather.diagnostic(), weather.diagnostic().contains("reading broadcast"));
-    }
-
-    @Test
-    public void aRestoredReadingIsReportedWithItsAge() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.restore(19.5f, "Toulouse", System.currentTimeMillis() - 45 * 60 * 1000L);
-        assertEquals(19.5f, weather.temperatureC(), 0.01f);
-        assertEquals("Toulouse/45min", weather.diagnostic());
-    }
-
-    @Test
-    public void anAbsentStickyBroadcastIsNotMistakenForAFailedParse() {
-        HeadUnitWeather weather = new HeadUnitWeather();
-        weather.accept(null);
-        assertNull(weather.temperatureC());
-        assertEquals("none held, none sent yet", weather.diagnostic());
-    }
-}
diff --git a/app/src/test/java/com/evsuite/abrp/ServerConfigTest.java b/app/src/test/java/com/evsuite/abrp/ServerConfigTest.java
new file mode 100644
index 0000000..f5bf0c8
--- /dev/null
+++ b/app/src/test/java/com/evsuite/abrp/ServerConfigTest.java
@@ -0,0 +1,47 @@
+package com.evsuite.abrp;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/** What the Server tab and the config import accept — pure JVM. */
+public class ServerConfigTest {
+
+    @Test
+    public void urlIsTrimmedAndLosesTrailingSlashes() {
+        assertEquals("https://car.example.com", ServerConfig.normalizeUrl("  https://car.example.com//  "));
+        assertEquals("https://car.example.com/base", ServerConfig.normalizeUrl("https://car.example.com/base/"));
+    }
+
+    @Test
+    public void plainHttpAndJunkAreRefused() {
+        // The token travels in a header; over plain http anyone on the hotspot could read it.
+        assertNull(ServerConfig.normalizeUrl("http://car.example.com"));
+        assertNull(ServerConfig.normalizeUrl("car.example.com"));
+        assertNull(ServerConfig.normalizeUrl("https://"));
+        assertNull(ServerConfig.normalizeUrl("https:///path"));
+        assertNull(ServerConfig.normalizeUrl("https://user@car.example.com"));
+        assertNull(ServerConfig.normalizeUrl("https://car.example.com/?x=1"));
+        assertNull(ServerConfig.normalizeUrl(null));
+    }
+
+    @Test
+    public void tokenMustMeetTheServersMinimum() {
+        assertTrue(ServerConfig.isValidToken("0123456789abcdef01234567"));
+        assertFalse(ServerConfig.isValidToken("too-short"));
+        assertFalse(ServerConfig.isValidToken("0123456789abcdef 01234567"));
+        assertFalse(ServerConfig.isValidToken(null));
+    }
+
+    @Test
+    public void installationIdMustBeAUuidTheServerAccepts() {
+        assertTrue(ServerConfig.isValidInstallationId("6f1a2b3c-4d5e-4f60-8a9b-0c1d2e3f4a5b"));
+        assertTrue(ServerConfig.isValidInstallationId(java.util.UUID.randomUUID().toString()));
+        assertFalse(ServerConfig.isValidInstallationId("6f1a2b3c-4d5e-0f60-8a9b-0c1d2e3f4a5b")); // version 0
+        assertFalse(ServerConfig.isValidInstallationId("not-a-uuid"));
+        assertFalse(ServerConfig.isValidInstallationId(""));
+    }
+}
diff --git a/app/src/test/java/com/evsuite/abrp/TelemetryQueueTest.java b/app/src/test/java/com/evsuite/abrp/TelemetryQueueTest.java
new file mode 100644
index 0000000..823a491
--- /dev/null
+++ b/app/src/test/java/com/evsuite/abrp/TelemetryQueueTest.java
@@ -0,0 +1,40 @@
+package com.evsuite.abrp;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.List;
+
+import org.junit.Test;
+
+/** The offline buffer for live samples — pure JVM. */
+public class TelemetryQueueTest {
+
+    @Test
+    public void batchesOldestFirstAndKeepsThemUntilConfirmed() {
+        TelemetryQueue queue = new TelemetryQueue();
+        queue.add("a");
+        queue.add("b");
+        assertEquals(List.of("a", "b"), queue.peekBatch());
+        // Not confirmed yet: a failed request must not lose them.
+        assertEquals(2, queue.size());
+        queue.remove(2);
+        assertEquals(0, queue.size());
+    }
+
+    @Test
+    public void aBatchNeverExceedsWhatTheServerAccepts() {
+        TelemetryQueue queue = new TelemetryQueue();
+        for (int i = 0; i < 1200; i++) queue.add(String.valueOf(i));
+        List<String> batch = queue.peekBatch();
+        assertEquals(TelemetryQueue.MAX_BATCH, batch.size());
+        assertEquals("0", batch.get(0));
+    }
+
+    @Test
+    public void whenFullTheOldestSamplesAreDropped() {
+        TelemetryQueue queue = new TelemetryQueue(3);
+        for (String s : new String[]{"a", "b", "c", "d", "e"}) queue.add(s);
+        assertEquals(List.of("c", "d", "e"), queue.peekBatch());
+        assertEquals(2, queue.dropped());
+    }
+}