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SMLIGHT
Release notes · Feb 28, 2026 · 2 min read

SLZB-OS v3.2.6.dev0

New: Thread + OTBR running on the device (SLZB-xU only) — evaluation/beta mode

You can now run OpenThread Border Router (OTBR) directly on the SLZB device, instead of running the OTBR add-on/app in Home Assistant.

Why this could be a no-brainer:

  • Home Assistant connects to OTBR via a network REST API, so you no longer rely on the Serial-over-IP link used in "Thread to external OTBR" mode.
  • Aims to improve reliability of Thread connectivity between Home Assistant and SLZB devices.

Home Assistant setup: OTBR REST API is available at http://device-ip:8080

Important notes / limitations:

  • Initial (beta) integration — may have limitations or unexpected behavior.
  • IPv6 is required and will be force-enabled when this mode is activated.
  • Cannot run together with "router (standard)" mode for the Ethernet ↔ WiFi bridge, or with Zigbee Hub mode.
  • "Transparent" WiFi ↔ Ethernet bridge mode is incompatible with this mode (use a previous SLZB-OS version if you need it).
  • Availability: SLZB-xU series only.
  • Alternative: you can still use "Thread + remote OTBR" mode (USB/Ethernet).

Improvements

  • Added uptime info for Socket2 and Socket3 in /ha_sensors.

Fixes

  • Fixed a crash in Zigbee Hub mode when a received value is larger than expected.