# mesh-bot

Minimal NestJS bot for Meshtastic. Long-running service that TCP-connects to a
Meshtastic serial bridge (raw socat pipe) at `192.168.1.4:4403`, sends
`want_config_id` on connect so the firmware streams its initial sync data,
parses inbound protobuf frames, logs received text messages, and exposes HTTP
endpoints to send text.

## Local run

```sh
npm i
npm run start:dev
```

## Docker

```sh
docker compose up -d --build
```

Exposed via Traefik only (no published ports) at `http://bot.dev.kkhost.pl`.

## Endpoints

All API endpoints live under the `/api` prefix:

- `GET /api/status` — `{ connected, myNodeNum, host, port }`
- `POST /api/send` — body `{ "text": "...", "to"?: <node number | node name | "!b" | "broadcast">, "replyId"?: <packet id> }`, returns `{ id }`. Numbers pass through as-is (integer in 1..0xffffffff); names resolve like `GET /api/nodes/:id` (exact long/short name, then unique substring) — unknown or ambiguous targets are a 400. Optional `replyId` (integer in 1..0xffffffff) references an earlier message's packet id from `GET /api/messages` — when set, the recipient app renders the text as a threaded reply/quote of that packet
- `POST /api/respond` — body `{ "messageId": <packet id>, "content": "..." }`, returns `{ id }`. Reply to an earlier message by packet id (from `GET /api/messages`) with automatic routing: rx records are answered as a DM back to the original sender unless the original was a broadcast (then the reply is a broadcast), tx records go to their destination, injected messages without a sender get a broadcast. The reply always rides the record's channel and carries `replyId = messageId`, so the recipient app renders it as a threaded quote of that packet. 400 on invalid messageId/content, 404 when no message has the given id (in memory or in SQLite), 503 when the bridge is down
- `GET /api/channels` — the device's Meshtastic channels as `{ index, name, uplinkEnabled, downlinkEnabled }[]` (psk/keys are redacted; empty until the initial sync completes)
- `GET /api/device` — device info captured during the initial sync: `{ myNodeNum, firmwareVersion?, metadata?, localConfig: {<section>: ...}, moduleConfig: {<module>: ...} }`. Key material is never exposed (security publicKey/privateKey/adminKey and network wifiPsk are replaced with `"REDACTED"`); in-memory only, reset on every bridge reconnect
- `GET /api/messages` — message history, newest first: inbound text (`dir:'rx'`, with `from` and `to`) and our sends (`dir:'tx'`, with `to` + `status`). tx records start `pending` and move to `delivered`/`failed` (with human-readable `ackError`) when the routing ACK/NACK arrives; broadcasts stay `pending` because firmware strips want_ack before TX. Backed by SQLite: the in-memory buffer (last 100) is seeded from the database on startup and re-upserted every second, so history survives process restarts and bridge reconnects; the database keeps the newest 1000 rows
- `POST /api/messages` — body `{ "text": "...", "from"?: <node number> }`, returns `{ id }`. Synthetic inbox injection for external triggers: records an rx entry in the history as if received on the mesh (channel 0) so external systems can push messages to trigger communication later. NOT transmitted over RF; appears in `GET /api/messages` like any other rx message
- `GET /api/forwarded` — the last 100 rx texts that passed the notify gate and were forwarded to opencode, newest first as `{ id, from?, text, channel, at }[]`: channel matched `MESH_NOTIFY_CHANNEL`, not a self-echo. The id is the packet id (real rx) or generated record id (injected); `from` omitted when there is no sender. In-memory only — reset on restart
- `GET /api/telemetry` — telemetry history, newest first: live `TELEMETRY_APP` packets from any node as `{ from, at /* epoch ms */, kind, data }[]`. `kind` is the `meshtastic.Telemetry` oneof case name (`deviceMetrics`, `environmentMetrics`, `airQualityMetrics`, `powerMetrics`, `localStats`, `healthMetrics`, `hostMetrics` or `trafficManagementStats`) and `data` carries that variant's payload (proto uint64 fields as decimal strings; unset optional fields omitted). In-memory only, last 100, reset on every bridge reconnect
- `GET /api/nodes` — known mesh nodes as `{ num, longName?, shortName?, hwModel?, batteryLevel?, lastHeard: number|null, position?: { lat, lon, alt? }, snr?, hopsAway?, viaMqtt? }[]`, sorted by node number. Collected during the initial sync plus live position updates; names/hwModel/battery appear only when reported, `lastHeard` is epoch seconds (null = never heard), `position` only when both coordinates are known, and snr/hopsAway/viaMqtt only when carried by the NodeInfo
- `GET /api/nodes/:id` — one node looked up by exact node number (numbers or numeric strings), then case-insensitive exact long/short name, else the unique case-insensitive substring match; 404 when nothing or more than one node matches

Interactive API docs (Scalar) are served at `/`, with the OpenAPI JSON at
`/docs-json`.

```sh
curl http://localhost:3000/api/status
curl -X POST http://localhost:3000/api/send -H 'content-type: application/json' -d '{"text":"hi"}'
curl -X POST http://localhost:3000/api/send -H 'content-type: application/json' -d '{"to":123456789,"text":"hello"}'
curl -X POST http://localhost:3000/api/respond -H 'content-type: application/json' -d '{"messageId":123456789,"content":"on my way"}'
curl http://localhost:3000/api/channels
curl http://localhost:3000/api/device
curl http://localhost:3000/api/messages
curl -X POST http://localhost:3000/api/messages -H 'content-type: application/json' -d '{"text":"external trigger"}'
curl http://localhost:3000/api/forwarded
curl http://localhost:3000/api/telemetry
curl http://localhost:3000/api/nodes
curl http://localhost:3000/api/nodes/kamil
```

`to` omitted, `"!b"`, or `"broadcast"` (case-insensitive) sends to the
broadcast address `0xffffffff`; anything else is a node number or name.
DMs are unicast and wantAck-tracked via `GET /api/messages`; broadcasts stay
pending because firmware strips want_ack before TX.

All sends always target channel index 3 (`test`) — never the primary
channel. Override with `MESH_SEND_CHANNEL`.

## MCP server

The bot also exposes an MCP (Model Context Protocol) endpoint at
`POST /mcp` (outside the `/api` prefix), served in-process over the SDK's
Streamable HTTP transport in stateless mode. It maps 1:1 to the REST
endpoints — no new logic; sends ride the pinned channel like their REST
counterparts (`respond` rides the original message's channel):

- `mesh_status` — bridge connection state (`{ connected, myNodeNum, host, port }`)
- `send_message(text, to?, replyId?)` — send a text message; `to` resolves like `POST /api/send` (omitted/""/"!b"/"broadcast" → broadcast, number or numeric string → node number, else name lookup); optional `replyId` makes the message render as a threaded reply/quote of that packet id from `get_messages`; returns `{ id }`; unknown/ambiguous targets are tool errors
- `respond(messageId, content)` — reply to an earlier message by packet id (from `get_messages`) with automatic routing: rx → DM back to the sender unless the original was a broadcast, tx → its destination, no-sender injected records → broadcast; rides the record's channel with `replyId = messageId` (threaded quote); returns `{ id }`; invalid args or an unknown id are tool errors
- `list_channels` — device channels (keys redacted)
- `list_nodes` — known nodes as lean summaries
- `get_node(id)` — one node by number or name; tool error when missing/ambiguous
- `get_messages` — message history, newest first (last 100, tx records carry delivery status)
- `inject_message(text, from?)` — synthetic inbox injection for external triggers: records an rx entry in the history as if received on the mesh; NOT sent over RF; appears in `get_messages` like any other rx record
- `get_telemetry` — telemetry history, newest first (last 100): device metrics and environment sensor readings from any node; `kind` is the Telemetry oneof case name
- `device_info` — device info from the initial sync: node number, firmware version, metadata and per-section config/module-config (key material redacted as `"REDACTED"`)

Point any MCP client at it (Streamable HTTP URL):

```json
{ "mcpServers": { "mesh-bot": { "url": "http://bot.dev.kkhost.pl/mcp" } } }
```

```sh
curl -X POST http://localhost:3000/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
```

## Automated weather reports

Hourly cron job (`src/weather`): fetches current conditions for Lublin from [Open-Meteo](https://open-meteo.com/) (free, no API key) and broadcasts a one-line report on the pinned send channel (index 3, `test`) — e.g. `Lublin weather: 18°C (feels 17), partly cloudy, humidity 65%, wind 12 km/h`. A failed fetch or send only logs a warn; it never crashes the app.

- `WEATHER_CRON` (default `'0 * * * *'`) — cron expression for the report schedule
- `WEATHER_LAT` (default `51.2465`) / `WEATHER_LON` (default `22.5684`) — coordinates queried from Open-Meteo
- `WEATHER_CITY` (default `"Lublin"`) — city name in the report line

## Opencode notifier

In-process service (`src/opencode`, no separate compose service): when an rx text message arrives on `MESH_NOTIFY_CHANNEL`, it pushes it to the mesh-bot folder's live opencode session (Basic auth). The opencode workspace UUID is regenerated on host restarts, so the notifier resolves it dynamically per request via the opencode API: `GET {OPENCODE_API}/api/workspaces` → match by `path == OPENCODE_WORKSPACE_PATH` (fallback name `mesh-bot`, status `ready` preferred when several match) → `GET {proxyPath}/session` → most recently updated session (`time.updated`; first entry if absent). No caching — messages are rare. The message POST body is exactly `{"parts":[{"type":"text","text":msg}]}` with msg = `New mesh message (id <packetId>)[ from node <n>]: "<text>" — please react to it.` (the `from node` part omitted when there is no sender; the packet id is the rx packet's id, or the generated record id for injected messages). opencode accepts the message immediately but holds the HTTP response until the agent turn finishes, so a 15 s read timeout on that POST means **delivered** — treated as success, never retried; workspace/session GET failures are retried up to 3 times with backoff (2 s / 10 s / 30 s) before being dropped.

Config lives in `.env` (gitignored) and is passed via compose environment — credentials are never committed to the repo:

- `OPENCODE_API` (default `http://172.24.0.1:9898`) — opencode API base URL as seen from the bot container (dev_net bridge → host; opencode binds 0.0.0.0 on the host)
- `OPENCODE_WORKSPACE_PATH` (default `/home/krzyw/projects/sandbox/mesh-bot`) — workspace matched by its `path` field (fallback name `mesh-bot`; status `ready` preferred when several match)
- `OPENCODE_SESSION` (optional, default empty) — pins a session ID; when set, session discovery is skipped. Empty/unset → the most recently updated session of the resolved workspace is used per request
- `OPENCODE_USER` / `OPENCODE_PASS` — Basic auth credentials; missing/empty **disables** the notifier (one startup log line, no-op) instead of failing

## Env vars

- `MESH_HOST` (default `192.168.1.4`) — bridge host
- `MESH_PORT` (default `4403`) — bridge port
- `MESH_RECONNECT_MS` (default `5000`) — reconnect interval in ms
- `MESH_SEND_CHANNEL` (default `3`) — channel index all sends target (`test`; never the primary channel)
- `MESH_NOTIFY_CHANNEL` (default `3`) — channel index whose rx texts trigger the opencode notifier (see "Opencode notifier"; synthetic injected messages, channel 0, trigger it too when set to match; messages from our own node are never notified)
- `MESH_DB_PATH` (default `./data/mesh-bot.db`) — SQLite file backing the message history (parent dir created if missing; in Docker, mounted at `/app/data` via a named volume so it survives container recreation)
- `MESH_POLL_MS` (default `1000`) — how often the poller re-upserts the message history into SQLite and prunes rows beyond the newest 1000
- `PORT` (default `3000`) — HTTP listen port

Note: the serial bridge accepts only ONE client at a time — if another app is
connected to the radio, this bot will not get a connection.