Broken OpenThread network

Configuration Matter/Thread
1

I own one Matter via OpenThread device and it was working great for a couple of months now.

Somehow it stopped working a few days ago, but I did not investigate it. Today I did some restarting and fiddling around but could not get it to work. Because it is only one device I decided to reinstall the OpenThread Border Router
addon and reset the device to build up from scratch. But even that is not working.

After adding the device all seems to go smooth but after a while the Companion app says it cannot connect to the thread network. In the OTBR logging I notice the following:

00:00:27.467 [N] Mle-----------: RLOC16 2000 -> fffe
00:00:27.824 [N] Mle-----------: Attach attempt 1, AnyPartition reattaching with Active Dataset
00:00:34.324 [N] RouterTable---: Allocate router id 8
00:00:34.324 [N] Mle-----------: RLOC16 fffe -> 2000
00:00:34.325 [N] Mle-----------: Role detached -> leader
00:00:34.325 [N] Mle-----------: Partition ID 0x5e4a3439
[NOTE]-BBA-----: BackboneAgent: Backbone Router becomes Primary!
00:00:36.261 [W] DuaManager----: Failed to perform next registration: NotFound

So my guess is the app (or device?) can reach the addon but it is not able to find a way back?

I’m out of ideas for now.

Some details about my config:

  • Core 2025.2.3
  • Supervisor 2025.02.1
  • Operating System 14.2
  • Frontend 20250210.0
  • Sonoff OT dongle
2

How many network interfaces do you have in HA?

3

Just one, running on a Odroid with wired connection. It has IPv4 and IPv6 enabled and IPv6 connectivity is available as far as I can see (tried pinging some public IPv6 services).

4

I reverted HA to a full backup of a week ago but that also didn’t solve anything.

So probably it is something in my network setup, but what? I did no changes in that area last week.

Did a lot of closing out:

  • tried comisioning with an other (Android) device, same result
  • installed mDns discovery on my phone: I am able to see the OTBR
  • bypassed my Unifi wifi by enabling (2.4 Ghz) wifi directly on the router
  • disabled end re-enabled IPv6 on HA (as far I understand this has no relation to OT but better safe then sorry)
  • restarted the OTBR and Matter addons a lot

At last I changed the OT channel from 15 to 24 and suddenly it started working agian. :smile: