meshcore-analyzer/docs/user-guide/configuration.md

Configuration

CoreScope is configured via config.json in the server's working directory. Copy config.example.json to get started.

Core settings

Field	Default	Description
port	3000	HTTP server port
apiKey	—	Secret key for admin API endpoints (POST/PUT routes)
dbPath	—	Path to SQLite database file (optional, defaults to meshcore.db)

MQTT

"mqtt": {
  "broker": "mqtt://localhost:1883",
  "topic": "meshcore/+/+/packets"
}

The ingestor connects to this MQTT broker and subscribes to the topic pattern.

Multiple MQTT sources

Use mqttSources for multiple brokers:

"mqttSources": [
  {
    "name": "local",
    "broker": "mqtt://localhost:1883",
    "topics": ["meshcore/#"]
  },
  {
    "name": "remote",
    "broker": "mqtts://mqtt.example.com:8883",
    "username": "user",
    "password": "pass",
    "topics": ["meshcore/SJC/#"]
  }
]

Branding

Field	Description
branding.siteName	Site title shown in the nav bar
branding.tagline	Subtitle on the home page
branding.logoUrl	URL to a custom logo image
branding.faviconUrl	URL to a custom favicon

Theme

Colors used throughout the UI. All values are hex color codes.

Field	Description
theme.accent	Primary accent color (links, buttons)
theme.navBg	Navigation bar background
theme.navBg2	Secondary nav background
theme.statusGreen	Healthy status color
theme.statusYellow	Degraded status color
theme.statusRed	Silent/error status color

See Customization for the full list — the theme customizer exposes every color.

Node colors

Default marker colors by role:

"nodeColors": {
  "repeater": "#dc2626",
  "companion": "#2563eb",
  "room": "#16a34a",
  "sensor": "#d97706",
  "observer": "#8b5cf6"
}

Health thresholds

How long (in hours) before a node is marked degraded or silent:

Field	Default	Description
healthThresholds.infraDegradedHours	24	Repeaters/rooms → degraded after this many hours
healthThresholds.infraSilentHours	72	Repeaters/rooms → silent after this many hours
healthThresholds.nodeDegradedHours	1	Companions/others → degraded
healthThresholds.nodeSilentHours	24	Companions/others → silent

Retention

Field	Default	Description
retention.nodeDays	7	Nodes not seen in N days move to inactive
retention.packetDays	30	Packets older than N days are deleted daily

Note: Lowering retention does not immediately shrink the database file. SQLite marks deleted pages as free but does not return them to the filesystem unless incremental auto-vacuum is enabled. New databases created after v0.x.x have auto-vacuum enabled automatically. Existing databases require a one-time migration — see the Database guide.

Database

Field	Default	Description
db.vacuumOnStartup	false	Run a one-time full VACUUM on startup to enable incremental auto-vacuum (blocks for minutes on large DBs)
db.incrementalVacuumPages	1024	Free pages returned to the OS after each retention reaper cycle

See Database for details on SQLite auto-vacuum, WAL, and manual maintenance. See #919 for background.

Channel decryption

Field	Description
channelKeys	Object of "label": "hex-key" pairs for decrypting channel messages
hashChannels	Array of channel names (e.g., "#LongFast") to match by hash

See Channels for details.

Map defaults

"mapDefaults": {
  "center": [37.45, -122.0],
  "zoom": 9
}

Initial map center and zoom level.

Regions

"regions": {
  "SJC": "San Jose, US",
  "SFO": "San Francisco, US"
}

Named regions for the region filter dropdown. The defaultRegion field sets which region is selected by default.

Cache TTL

All values in seconds. Controls how long the server caches API responses:

"cacheTTL": {
  "stats": 10,
  "nodeList": 90,
  "nodeDetail": 300,
  "analyticsRF": 1800
}

Lower values = fresher data but more server load.

Packet store

Field	Default	Description
packetStore.maxMemoryMB	1024	Maximum RAM for in-memory packet store
packetStore.estimatedPacketBytes	450	Estimated bytes per packet (for memory budgeting)
packetStore.retentionHours	0	Only load packets younger than N hours on startup and keep them in memory. Set this on any instance with a large DB. 0 = unlimited (loads full DB history — causes OOM on cold start when the DB has hundreds of thousands of paths). Recommended: same as retention.packetDays × 24 (e.g. 168 for 7 days).

Warning: Leaving retentionHours at 0 on a large database will cause the server to OOM-kill itself on every cold start. The full packet history is loaded into the subpath index at startup; a DB with ~280K paths produces ~13M index entries before the process is killed.

Timestamps

Field	Default	Description
timestamps.defaultMode	"ago"	Display mode: "ago" (relative) or "absolute"
timestamps.timezone	"local"	"local" or "utc"
timestamps.formatPreset	"iso"	Date format preset

Live map

Field	Default	Description
liveMap.propagationBufferMs	5000	How long to buffer observations before animating

HTTPS

"https": {
  "cert": "/path/to/cert.pem",
  "key": "/path/to/key.pem"
}

Provide cert and key paths to enable HTTPS.

Geographic filtering

"geo_filter": {
  "polygon": [[51.55, 3.80], [51.55, 5.90], [50.65, 5.90], [50.65, 3.80]],
  "bufferKm": 20
}

Restricts ingestion and API responses to nodes within the polygon plus a buffer margin. Remove the block to disable filtering. Nodes with no GPS fix always pass through.

Can also be configured live via the 🗺️ GeoFilter tab in the Customizer (requires apiKey).

See Geographic Filtering for the full guide.

Home page

The home section customizes the onboarding experience. See config.example.json for the full structure including steps, checklist, and footerLinks.