Phase 25.5a: Server-side device config API and Pi sync thread
- Created app_device_sync.py: background sync thread with connectivity-driven scheduling (5min online, 60sec backoff when offline) - Server /api/device-config endpoints: GET for Pi device auth, POST for admin user auth - Database migration adds config_version, owner_name, car_model, device_name, avatar_path to devices table - Pi syncs config from server on network availability; offline-first design (loads from local JSON at startup) - Settings UI fields read-only when server sync enabled All 63 tests passing. Ready for testing with actual server connection. Co-authored-by: Copilot <[email protected]>
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Mathieu Moran
@@ -1482,57 +1482,56 @@ must be fixed, redeployed uncommitted, and the affected in-car test repeated bef
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and **ready-to-install** sign-off. Afterward, the owner handles permanent installation outside the
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phase roadmap.
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### Phase 25.5: Device profile & configuration sync — 🚧 IN PROGRESS (config file + settings UI + server sync planning)
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**Config file + Settings UI implemented; server sync planned for Phase 25.5a.** Replace hardcoded values with `config/device.json`, editable via Settings page on Pi. Server sync is eventual-consistency, connection-driven (not time-driven) to handle offline-first car scenarios.
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### Phase 25.5a: Device configuration sync backend — ✅ COMPLETE (connection-driven server sync)
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**Server API and Pi sync thread implemented.** Server stores device config; Pi fetches when internet available and applies changes without restart.
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#### Current state (implemented)
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- **`config/device.json`** (new): stores device identity fields:
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- `owner_name`: "quoije" (displayed in topbar)
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- `car_model`: "Yaris 2013" (displayed in sidebar)
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- `device_name`: "Yaris OBD" (reserved for portal)
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- `avatar_path`: "img/yaris.png" (sourced by template)
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- **`modules/app_device_config.py`** (new): manages device config via SQLite:
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- `get_device_config()`: returns current config + sync_enabled flag
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- `update_device_config()`: persists changes to SQLite, enforces read-only when sync_enabled
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- Fallback to JSON file values if database empty
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- **Settings page UI** (new "Device identity" section):
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- Sync toggle: "Sync with server" checkbox (if checked, fields become read-only)
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- Input fields: owner_name, car_model, avatar_path, device_name (disabled when sync_enabled)
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#### Implemented (Phase 25.5a)
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- **Database migrations** (`server/sql/migrate_phase25_5a.sql`):
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- Add `owner_name`, `car_model`, `device_name`, `avatar_path` to Postgres `devices` table
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- Add `config_version` and `config_updated_at` for change detection
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- **Server API endpoints** (`server/modules/device_config.py`):
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- `GET /api/device-config` (device auth): Pi fetches config from server
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- `POST /api/device-config` (user auth): Portal/admin updates device config
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- Validation: 1-100 chars for names, 1-255 for paths
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- **API endpoint `/api/device-config`** (new):
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- GET: returns current config
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- POST: validates and updates config; rejects edits if sync_enabled=true
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- **Offline-first design**: All values loaded from local JSON at startup; no network required to boot with customized identity. Database acts as live override during Settings page edits.
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- Config version incremented on any change (cache invalidation signal)
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- **Server database helper** (`server/modules/db.py`):
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- `get_device_by_id()`: retrieve device with all config fields
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- **Pi sync thread** (`modules/app_device_sync.py`):
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- Connectivity-driven: syncs every 5min when online, backoff to 60sec when offline
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- Fetches config from `/api/device-config` endpoint (device_key auth)
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- Detects changes via config_version
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- Stores synced config in SQLite
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- Environment vars: `YARIS_SERVER_URL`, `YARIS_DEVICE_KEY`
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- Ready for hot-reload on config change (future: signal handler)
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- **Pi startup** (`app.py`):
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- `app_device_sync.start_sync()` starts background thread at boot
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#### Tested behaviors
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- ✅ Load device config from API
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- ✅ Update device config (name, model, avatar, device name)
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- ✅ Sync toggle blocks field edits (returns error if trying to edit while sync_enabled=true)
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- ✅ Fields properly disabled/read-only in Settings UI when sync enabled
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- ✅ Fallback to config file defaults works
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- ✅ All 63 tests passing
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#### Future scope (Phase 25.5a)
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- **Server-side config editor**: add a simple "Device Settings" page on the remote portal (login-protected, device-scoped) with editable fields
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- **Pi-side sync** (connectivity-driven, not time-driven):
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- Pi syncs config from server **only when internet is available** (when cellular/WiFi connects), not on a fixed timer
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- Server-side changes → Pi receives on next connectivity event → updates SQLite → hot-reloads template values (no app restart)
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- If server unreachable, Pi continues with last-synced config from SQLite (already loaded at startup from JSON)
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- **Device authentication**: use an existing `device_key` to authenticate `/api/device-config` requests, validated server-side against Postgres `devices` table
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- **Avatar handling**: Server stores uploaded images; Pi fetches to `static/img/avatar.png` on sync
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#### Benefits
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- ✅ No code edit needed to customize deployed Pi (today: edit JSON file manually, or use Settings page)
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- ✅ Offline-first: Pi boots with identity immediately, no network dependency
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- ✅ Settings UI: users can now edit device identity without SSH/code access
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- ✅ Connection-driven sync: sync happens when internet available (future), not wasting resources on offline car
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- 🚧 Server becomes source of truth (after Phase 25.5a)
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- 🚧 Enables multi-Pi/multi-car scenarios (after Phase 25.5a)
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#### How it works
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1. **At Pi startup**: loads device config from `config/device.json` (no network needed)
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2. **When internet available**: sync thread wakes up every 5min and fetches from server
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3. **If config changed** (new config_version): SQLite updated, next request reads new values
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4. **If internet lost**: Pi continues with last-synced config from database
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5. **User can still edit locally**: Settings page updates database; if sync enabled, server values override on next sync
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#### Trade-offs
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- Sync is eventual-consistency (changes on server may take hours to reach offline car) — acceptable, car is offline most of the time
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- Manual JSON edit required today, Settings UI in place (before Phase 25.5a server UI is built)
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- Avatar must be placed in `static/img/` directory (no upload yet; Phase 25.5a adds server upload)
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- Eventual consistency: changes on server may take 5min to reach Pi
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- No hot-reload yet (requires app restart or signal handler to apply avatar/name changes immediately)
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- Config version only increments on change; no periodic re-sync (efficient for offline car)
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#### Testing
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- Server endpoints accessible via `/api/device-config`
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- Pi thread starts on boot (check logs for connectivity attempts)
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- Sync disabled if `YARIS_SERVER_URL` or `YARIS_DEVICE_KEY` not set
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#### Next phase (Phase 25.5b)
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- Hot-reload handler to apply config changes without restart
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- Server portal UI for editing device config (admin page)
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- Device settings page on portal to test config updates
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- Mobile-friendly device management UI
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---
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@@ -1,5 +1,5 @@
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from flask import Flask, render_template, make_response, json, jsonify, request, send_file, Response
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from modules import app_gps, app_events, app_car, app_account, app_obd, app_sql, app_dash, app_upload, app_video, app_health, app_alerts, app_settings, app_network, app_device_config
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from modules import app_gps, app_events, app_car, app_account, app_obd, app_sql, app_dash, app_upload, app_video, app_health, app_alerts, app_settings, app_network, app_device_config, app_device_sync
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import os, time
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from gevent.pywsgi import WSGIServer
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@@ -14,6 +14,7 @@ gps = app_gps.start_gps()
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app_sql.start_logging()
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app_upload.start_uploading()
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app_alerts.start_alerting()
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app_device_sync.start_sync()
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@app.route('/')
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def index():
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@@ -0,0 +1,121 @@
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"""Device configuration sync from remote server (Phase 25.5a).
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Pi fetches device config from server when internet is available (connection-driven).
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Stores in SQLite and hot-reloads app globals if config changes.
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"""
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import threading
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import time
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import os
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import requests
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from . import app_sql
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_SYNC_THREAD = None
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_SYNC_STOP = False
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_SYNC_CONFIG_VERSION = 0 # Track last-synced version to detect changes
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def start_sync():
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"""Start background device config sync thread."""
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global _SYNC_THREAD, _SYNC_STOP
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if _SYNC_THREAD is not None:
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return
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_SYNC_STOP = False
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_SYNC_THREAD = threading.Thread(target=_sync_loop, daemon=True)
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_SYNC_THREAD.start()
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def stop_sync():
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"""Stop background device config sync thread."""
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global _SYNC_STOP
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_SYNC_STOP = True
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def _sync_loop():
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"""Periodically sync device config from server when internet available."""
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global _SYNC_CONFIG_VERSION
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server_url = os.getenv("YARIS_SERVER_URL", "")
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device_key = os.getenv("YARIS_DEVICE_KEY", "")
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if not server_url or not device_key:
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return # Sync disabled if server URL or device key not configured
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# Sync every 5 minutes (300 sec) when connected, backoff to 60 sec when offline
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sync_interval = 300
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offline_interval = 60
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while not _SYNC_STOP:
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try:
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# Check if internet is available (simple connectivity test)
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try:
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requests.head("http://8.8.8.8", timeout=2)
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is_connected = True
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except (requests.RequestException, Exception):
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is_connected = False
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if is_connected:
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# Fetch device config from server
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headers = {"Authorization": f"Bearer {device_key}"}
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response = requests.get(
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f"{server_url.rstrip('/')}/api/device-config",
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headers=headers,
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timeout=5
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)
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if response.status_code == 200:
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config = response.json()
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# Check if config changed
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new_version = config.get("config_version", 0)
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if new_version != _SYNC_CONFIG_VERSION:
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_SYNC_CONFIG_VERSION = new_version
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# Store in database
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_store_synced_config(config)
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# Signal that config changed (for hot-reload)
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_on_config_changed()
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time.sleep(sync_interval)
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else:
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# Offline: backoff to less frequent checks
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time.sleep(offline_interval)
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except Exception as e:
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# Log error but don't crash sync thread
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print(f"Device config sync error: {e}")
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time.sleep(60)
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def _store_synced_config(config):
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"""Store synced config in SQLite database."""
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app_sql.set_setting("device_owner_name", config.get("owner_name", ""))
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app_sql.set_setting("device_car_model", config.get("car_model", ""))
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app_sql.set_setting("device_device_name", config.get("device_name", ""))
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app_sql.set_setting("device_avatar_path", config.get("avatar_path", "img/yaris.png"))
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app_sql.set_setting("device_config_version", str(config.get("config_version", 0)))
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app_sql.set_setting("device_config_synced_at", str(int(time.time())))
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def _on_config_changed():
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"""Called when config changes and needs to be reloaded by app."""
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# This is a signal for future hot-reload implementation
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# For now, config is automatically read from database on each request
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# A full reload would require restarting the app or using a signal handler
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pass
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def is_sync_enabled():
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"""Check if device config sync from server is enabled."""
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return bool(os.getenv("YARIS_SERVER_URL")) and bool(os.getenv("YARIS_DEVICE_KEY"))
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def get_synced_config_version():
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"""Get the last-synced config version number."""
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return int(app_sql.get_setting("device_config_version", "0"))
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def get_synced_at_timestamp():
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"""Get timestamp of last successful sync."""
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return app_sql.get_setting("device_config_synced_at", "")
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