# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## What this project does

Yodmon is a bridge between the **Yodeck** digital signage API and **Zabbix** monitoring. It polls the Yodeck API every 10 minutes, stores player state in SQLite, exposes the data via SNMP v2c (for Zabbix to poll every minute), auto-creates/updates Zabbix hosts, and provides a web dashboard.

## Running locally (dev)

```bash
pip install flask requests apscheduler
python dev_server.py          # web UI at http://localhost:8080
python snmp_test.py           # print OID tree to verify SNMP data
python snmp_test.py --filter <name_or_id>
```

`dev_server.py` sets `DB_PATH` to `./data/yodmon.db` and skips SNMP (Linux/Docker only).

## Running in Docker

```bash
docker compose up -d          # SNMP on :161/udp, web UI on :8080
```

Before starting, set `APP_HOST` in `docker-compose.yml` to the host IP reachable by Zabbix, and optionally fill in `ZABBIX_URL` / `ZABBIX_PASSWORD`.

## Configuration

All settings come from environment variables (see `app/config.py`). Key ones:

| Variable | Default | Purpose |
|---|---|---|
| `YODECK_API_TOKEN` | — | `Token yodeck:<secret>` format |
| `APP_HOST` | `127.0.0.1` | IP Zabbix uses to reach this app's SNMP agent |
| `ENTERPRISE_OID` | `.1.3.6.1.4.1.99999` | Root OID for all player data |
| `SNMP_COMMUNITY` | `public` | SNMPv2c community string |
| `ZABBIX_URL` | `""` | Leave empty to disable Zabbix auto-sync |
| `DB_PATH` | `/data/yodmon.db` | SQLite file path |

## Architecture

```
Yodeck API (every 10 min)
    └── app/scheduler.py  →  app/yodeck.py     fetches all screens (paginated)
                          →  app/database.py   upserts players + writes logs
                          →  app/zabbix.py     creates/updates Zabbix hosts via JSON-RPC API

Zabbix SNMP poll (every 1 min)
    └── snmpd (net-snmp)  →  snmp/pass_persist.py  reads SQLite, serves OIDs over stdin/stdout

Web UI
    └── app/web.py (Flask)  →  templates/index.html  shows player table + activity log
```

**SNMP OID structure** — `ENTERPRISE_OID.1.1.<column>.<yodeck_id>`:
- col 1 `STRING` hostname (`yodeck-<id>`)
- col 2 `STRING` display name
- col 3 `INTEGER` online (0/1)
- col 4 `STRING` last_seen (ISO-8601)
- col 5 `INTEGER` updating (0/1)
- col 6 `INTEGER` registered (0/1)

The Yodeck ID is used directly as the SNMP table index, so OIDs are stable and predictable (e.g. `.1.3.6.1.4.1.99999.1.1.3.54239` = online status of player 54239).

**Database** — two tables in `yodmon.db`:
- `players` — one row per Yodeck player, upserted on each poll
- `logs` — append-only activity log; event types: `yodeck_fetch`, `zabbix_sync`, `snmp_transfer`, `error`

**Docker entrypoint** (`entrypoint.sh`) templates `/etc/snmp/snmpd.conf` from env vars at startup, then starts `snmpd` in the background before handing off to `python main.py`.

**Zabbix integration** (`app/zabbix.py`) targets Zabbix 6.0+ API (`item type 20` = SNMP agent). Set `ZABBIX_URL` to enable; the sync runs after every successful Yodeck poll.