GL-S200 Thread Border Router Integration Plan

Planning notes for adding a GL.iNet GL-S200 as a Thread Border Router for Home Assistant on concord NUC.

Device Overview

GL-S200 (product page)

Spec	Value
CPU	QCA9531 @ 650 MHz
RAM / Flash	128 MB DDR2 / 128 MB NAND
OS	GL.iNet firmware (OpenWrt 21.02, kernel 5.4)
Radios	Thread + BLE 5.0 + Wi-Fi 2.4 GHz b/g/n (150 Mbps)
Ports	1x WAN, 1x LAN (10/100 Mbps)
Power	USB-C 5V / 2A
Role	Thread Border Router (OTBR) — not a Matter controller; Matter runs on top via python-matter-server already deployed on the NUC

Where to Plug It In

Must land on the same L2 segment as Home Assistant.

HA runs as a Docker container on vish-concord-nuc with network_mode: host. The NUC sits on 192.168.68.0/22 (gateway 192.168.68.1) — deliberately separated from the main homelab LAN (192.168.0.0/24).

Thread/Matter border router discovery uses mDNS (_meshcop._udp), which is link-local. Cross-subnet discovery would require an mDNS reflector (not currently deployed). So:

✅ Plug S200 WAN into a switch/AP on 192.168.68.0/22 (same segment as the NUC).
❌ Do not plug into the main 192.168.0.0/24 LAN — HA will not see it.

Existing Stack on Concord NUC

Compose: concord_nuc/homeassistant.yaml

Service	Purpose	Status
`homeassistant`	HA Core (host networking)	Running
`matter-server`	python-matter-server (host networking)	Running
`piper`	Wyoming TTS (port 10200)	Running
`whisper`	Wyoming STT (port 10300)	Running
`openwakeword`	Wyoming wake word (port 10400)	Running

The Matter server is already in place — the S200 plugs in as the radio layer for Thread. No compose changes needed to add the S200 itself.

Integration Steps (When Device Arrives)

Physical setup
- Connect S200 WAN to the 192.168.68.0/22 network.
- Power via USB-C (5V/2A).
- First-boot admin UI reachable at 192.168.8.1 until reconfigured, then at the DHCP-assigned 192.168.68.x address.
- Update firmware, set an admin password.
Verify mDNS discovery from the NUC
```
# Run on concord NUC (Tailscale: 100.72.55.21)
avahi-browse -rt _meshcop._udp
```
Should list the S200 as a Thread Border Router with a TXT record containing rv=1, tv=1.3.0, etc.
Add to Home Assistant
- Settings → Devices & Services → Add Integration → Thread
- S200 should auto-discover. Add it as an External Thread Border Router.
- Settings → Devices & Services → Add Integration → Matter (BETA) (already configured to talk to the local matter-server container).
Pair Matter devices
- Use the Home Assistant Companion app (iOS/Android) to pair.
- The app hands off Thread commissioning credentials to each device so it joins the S200's mesh.

Gotchas

Firmware lag: GL.iNet's OTBR implementation trails upstream OpenThread. Check the admin UI for firmware updates before committing to the device.
No Zigbee: S200 is Thread-only. Existing Zigbee devices (if any) still need a separate coordinator (e.g., a Zigbee stick on the NUC via Zigbee2MQTT or ZHA).
Thread credential backup: Once the S200 forms an operational dataset (network name, PAN ID, network key), export and back it up — losing it means re-commissioning every Thread device.
HA network_mode: host is load-bearing: If HA is ever migrated to bridge networking, Matter/Thread discovery breaks. Keep host networking.

Status

S200 acquired
Plugged into 192.168.68.0/22 segment
mDNS discovery verified from NUC
Added to HA Thread integration
First Matter device paired
Thread operational dataset backed up

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