[SOLVED] OpenThread Border Router add-on error

Configuration Matter/Thread
1

I’ve just got a hold of my brand spanking new SLZB-MR1U. I’ve configured radio 1 to ZHA, and it’s working just fine. I’m trying to configure Radio 2 to work with Matter over Thread, but I’m encountering some issues.

  • I’ve installed the Matter addon. It seems to be light-on any configuration, so I assume it’s working ok. The logs seem to indicate it’s working fine.
  • I’ve installed and configured the OpenThread Border Router add-on to point to the IP:Port. The Baud Rate didn’t need changing. Checking the logs. I get hte following:
-----------------------------------------------------------
Add-on: OpenThread Border Router
OpenThread Border Router add-on
-----------------------------------------------------------
Add-on version: 2.15.3
You are running the latest version of this add-on.
System: Home Assistant OS 17.0 (amd64 / generic-x86-64)
Home Assistant Core: 2026.1.2
Home Assistant Supervisor: 2026.01.1
-----------------------------------------------------------
Please, share the above information when looking for help
or support in, e.g., GitHub, forums or the Discord chat.
-----------------------------------------------------------
s6-rc: info: service banner successfully started
[16:55:46] INFO: Starting socat TCP client for OTBR daemon...
2026/01/20 16:55:46 socat[170] E tcp: wrong number of parameters (3 instead of 2)

And the last two lines keep repeating over and over.

Looking in settings (the new section), I can’t configure the Thread preferred network, presumably because of the error above.

I’ve tried adding the Open Thread Border Router integration. It asks for the URL for OpenThread Border Router’s REST API. Pointing it to Home Assistant and port 8081, just givers me “Failed to connect”, again presumably of hte error the Open Thread Border Router addon is getting.

I’ve kind of hit a brick wall. Can anybofy help?

Edit: PEBKAC error. I entered the network device in as a URL. I feel dumb. LOL.

2

Can you post your OTBR yaml config please.

3

After talking to a person on reddit, I only just got it working now… The problem was I put the IP:Port in as a URL. My bad.

4

can you please post the actual configuration / URL that provided the solution to you here so everyone can benefit from it. Thank you!

5

I think you misunderstand. My mistake was that I put it as a URL. Instead, I just entered the IP and port as specified on the SLZB-MR1U dashboard (without the “http://”), and it worked.