MeshMonday

Simple web service for MeshCore Monday check-ins.

Features

• MQTT ingestion for meshcore/+/+/packets (all IATA regions) with topic metadata extraction per packet
• MeshCore packet decoding (header/path/payload extraction)
• Monday check-in board with DiceBear avatars and animated tiles
• Leaderboard with:
  • Most check-ins (tracked from configurable date)
  • Longest Monday streak (with streak start date)
• SQLite storage with WAL mode and dedupe by packet hash

Local macOS development (non-Docker)

1. make setup
2. Start an MQTT broker locally (localhost:1883) or point .env.local to your broker.
3. Run app once: make run
4. Run with hot reload: make dev (auto-installs air if needed)
5. Seed sample data (optional): make dev-seed
6. Replay fixtures (optional): make replay-checkins
7. Rebuild checkin packet links from stored raw packets (optional): make restore-checkin-packets

Open http://127.0.0.1:8080.

Channel decryption keys

• Public channel key is built in: 8b3387e9c5cdea6ac9e5edbaa115cd72.
• Deterministic hashtag channels: set HASHTAG_CHANNELS (comma-separated names, with or without #).
• Private channels: set PRIVATE_CHANNEL_KEYS as comma-separated 16-byte hex keys.

Ingest safety limits

• MQTT_MAX_PAYLOAD_BYTES caps raw MQTT message size before processing (default 16384).
• INGEST_MAX_PACKET_HEX_CHARS caps packet/envelope raw hex length accepted by ingest (default 8192).
• INGEST_MAX_OBSERVER_KEY_CHARS caps observer key length from envelope/topic (default 64).

UI settings

• DiceBear avatar style: set DICEBEAR_STYLE to any DiceBear style slug (e.g. rings, adventurer, pixel-art, bottts).
• Auto-refresh polling interval: set UI_POLL_SECONDS (default 15, set 0 to disable).

IATA filtering

• Ingest subscribes to all IATAs via meshcore/+/+/packets.
• Display/query filtering is controlled by IATA_FILTERS:
  • ALL for all regions
  • comma-separated list such as SEA,PDX,YVR

Key paths

• Server entrypoint: cmd/server/main.go
• MQTT replay utility: cmd/replay/main.go
• Seed utility: cmd/devseed/main.go
• SQLite + migrations: internal/storage/sqlite.go
• Decode logic: internal/meshcore/decode.go
• Monday page: web/templates/index.html
• Leaderboard page: web/templates/leaderboard.html

Tests

• make test
• make test-integration

Docker for production

1. Create .env with production values.
2. Run docker compose up -d --build

Image automation

• GitHub Actions now builds Docker images automatically:
  • Pull requests to main: build-only validation (no push).
  • Pushes to main and version tags (v*): build and push to GHCR.
• Image builds are multi-arch for linux/amd64 and linux/arm64.
• Published image path: ghcr.io/agessaman/meshmonday

Public deployment recommendations

• Run behind TLS termination (reverse proxy or load balancer).
• Keep default server timeouts and header size limits in place.
• Avoid exposing internal errors to clients (API returns generic internal_error on failures).
• Use MQTT credentials with publish ACLs scoped to expected topics.

Backups

Backup helper: scripts/backup_sqlite.sh.

Maintenance

• Rebuild checkin_packets from raw_packets with current parsing/decryption rules:
  • make restore-checkin-packets
• This is useful after schema cleanup or if packet-link rows were lost.
• Raw packet retention runs inside the server process (RAW_MONDAY_RETAIN_WEEKS, RETENTION_INTERVAL_MINUTES). Checkins and linked rows are always kept; ambient mesh traffic is trimmed to recent Mondays in TZ.
• SQLite connections use a 30s busy_timeout on every pooled connection so MQTT inserts wait briefly instead of failing while retention deletes run.
• DELETE does not shrink the .db file: freed pages go on SQLite’s freelist inside the file; the OS sees the same size until you run VACUUM (or rebuild). Retention logs freelist_mib after each prune so you can see how much space is logically free but still inside the file. The server runs a WAL checkpoint after pruning to trim the -wal sidecar when possible.
• raw_packets vs packet_observations: the first stores each distinct packet payload (large hex blobs). The second stores which observer gateway reported each (packet_hash, observer) pair for Mesh Monday check-in observer badges—not duplicate payloads. Both tables shrink when raw_packets rows are deleted (FK cascade); the file still needs VACUUM to give disk space back.
• After a large prune, compact on disk: make vacuum (uses SQLITE_PATH from your env file). Run during a low-traffic window; VACUUM needs temporary disk headroom roughly the size of the database.

Example nightly cron: 0 2 * * * cd /opt/meshmonday && ./scripts/backup_sqlite.sh ./data/meshmonday_prod.db ./backups