Cannot add Matter devices, although OTBR is up and running

Configuration Matter/Thread
,
1

Hello!
I am desperately trying to setup my OTBR in Home Assistant with my Sonoff Dongle Max.
I flashed the dongle for Thread RCP Mode and it is running in this mode. It is also connected to my LAN (Wifi for testing).

I have configured the OTBR using the following YAML code:

device: >-
/dev/serial/by-id/usb-SONOFF_SONOFF_Dongle_Max_MG24_fe650a656dfaef11bd2995256d9880ab-if00-port0
baudrate: “460800”
flow_control: false
otbr_log_level: error
firewall: true
nat64: true
network_device: Dongle-M.local:6638

I have enabled ipv6 in my network and HA has automatically received some ipv6 configs.

When I now start the OTBR the logs say:

INFO: Successfully sent discovery information to Home Assistant.

Looks all good so far.

Still, when I am trying to add a new Matter Device (Ikea device) via the companion app, the error occurs, that there is no Thread Border Router in my private network.

I have set the preferred network in the HA Threads configuration, my OTBR is listed there and I have synched the credentials in the companion app.

Any idea what could be my problem, that I am still not able to add a matter device?

Thanks for your help.

Best Regards
Christoph

2

Did you synchronize the Thread credentials?
In HA Android App: Setup → Companion App → Troubleshooting → Sync Thread Credentials

3

yes I did multiple times.

4

I checked my config. I have

baudrate: "460800"
flow_control: false
otbr_log_level: notice
firewall: false
nat64: false
network_device: 192.168.1.79:6638

I have nat64:false Maybe that is the issue?

5

I finally fixed it.
I had all my IoT devices in a vLan and this caused some troubles. Changing this was the solution and now everything is working as expected.