# Internet Monitor

## Hardware

### Primary target

  - [Waveshare ESP32-S3](https://www.waveshare.com/esp32-s3-lcd-1.3.htm?sku=30558) ([docs](https://www.waveshare.com/wiki/ESP32-S3-LCD-1.3))
  - [W5500 Ethernet Module](https://www.az-delivery.de/en/products/w5500-ethernet-netzwerk-internet-modul-fuer-arduino)

## Test procedure

1. Check physical link
   - Ethernet unplugged?
2. Run DHCP / IPv4 config
   - IP assigned?
   - Subnet?
   - Gateway?
   - DNS server?
3. Run SLAAC / IPv6 config
   - IP assigned?
   - Subnet?
   - Gateway?
   - DNS server?
3. Test local Gateway
   - Router reachable? IPv4, IPv6
4. Routing/Uplink
   - Ping 1.1.1.1, 8.8.8.8, 9.9.9.9
   - Ping 2606:4700:4700::1111, 2001:4860:4860::8888, 2620:fe::fe
5. DNS
   - Resolve google.com, cloudflare.com, example.com
   - Timeout?
   - NXDOMAIN?
6. S2S VPN
   - Ping other side
7. Packet throughput
8. Measure latency
9. Measure temperature inside rack

## Display

```
🟢 ONLINE
Latency: 23ms
Packet loss: 4.2%
IPv4: 192.168.0.123/24
IPv6: 2001:d8::1234:5678:90ab:cdef/64
Temperature: 42°C
```

## Future ideas

- Prometheus endpoint
- Test Wifi

# Build

1. Setup ESP IDF
   - Using Nix
     ```
     nix develop
     ```
   - Manually
     - Check correct version in flake
     - Setup IDF per docs: https://docs.espressif.com/projects/esp-idf/en/stable/esp32/get-started/index.html#installation
2. Configure?
3. Compile
4. Flash