HA + deconz (Zigbee) + ZBT-2 (Thread/Matter): Cannot create/find Matter network

Configuration Matter/Thread
1

Hi *,
I’ve read a lot of material, but somethin is different with my installation:
Setup:
Fresh install in a Pi4 on SSD (coming from deconz with ioBroker).
Installed deconz and imported my old config --° works
Pi gets a permanent IP on 192.168.xxx.xxx internal network
System is now updated to 2026.9.2
Leave all configs on default.

Have some ikea matter devices and wanted to use them. Bought an ZBT-2 for this.
Installed it and selected/flashed the matter firmware as described here till Step 6:

All fine so far, but the next step doesn’t work for me.
I only see the “you dont’ have a prefered network”

Installed manually Thread, Matter server & OTBR as they were NOT installed automatically
OTBR selected automatically
/dev/serial/by-id/usb-Nabu_Casa_ZBT-2_441BF6857E98-if00
instead of
/dev/serial/by-id/usb-FTDI_FT230X_Basic_UART_DM01H1K3-if00-port0
which seems to be OK for me.

ZBT-2 is slowly flashing

Did all so far directly via browser, not via companion app.

OTBR log seems a little bit strange cause of an stated IP starting with 172, which is NOT part of my network

Any idea, where there could be the problem?

Any additional infos needed?

Regards

s6-rc: info: service banner successfully started
s6-rc: info: service otbr-agent: starting
[15:29:43] INFO: Setup OTBR firewall...
[15:29:43] INFO: Migrating OTBR settings if needed...
2026-09-15 15:29:43 homeassistant asyncio[234] DEBUG Using selector: EpollSelector
2026-09-15 15:29:43 homeassistant zigpy.serial[234] DEBUG Opening a serial connection to '/dev/serial/by-id/usb-Nabu_Casa_ZBT-2_441BF6857E98-if00' (baudrate=460800, xonxoff=False, rtscts=True)
2026-09-15 15:29:43 homeassistant serialx.platforms.serial_posix[234] DEBUG Locking serial port '/dev/serial/by-id/usb-Nabu_Casa_ZBT-2_441BF6857E98-if00'
2026-09-15 15:29:43 homeassistant serialx.platforms.serial_posix[234] DEBUG Configuring serial port '/dev/serial/by-id/usb-Nabu_Casa_ZBT-2_441BF6857E98-if00'
2026-09-15 15:29:43 homeassistant serialx.platforms.serial_posix[234] DEBUG Configuring serial port: TcsetattrFlags(iflag=0, oflag=0, cflag=2147486896, lflag=0, ispeed=4100, ospeed=4100, cc_vmin=0, cc_vtime=0) + cc=[b'\x03', b'\x1c', b'\x7f', b'\x15', b'\x04', 0, 0, b'\x00', b'\x11', b'\x13', b'\x1a', b'\x00', b'\x12', b'\x0f', b'\x17', b'\x16', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00', b'\x00']
2026-09-15 15:29:43 homeassistant serialx.platforms.serial_linux[234] DEBUG Setting low latency mode: True
2026-09-15 15:29:43 homeassistant serialx.platforms.serial_posix[234] DEBUG Setting modem pins: ModemPins[dtr rts]
2026-09-15 15:29:43 homeassistant serialx.platforms.serial_posix[234] DEBUG Setting TIOCMBIS: 0x00000006
2026-09-15 15:29:43 homeassistant zigpy.serial[234] DEBUG Connection made: <serialx.platforms.serial_linux.LinuxSerialTransport object at 0x7fa402a190>
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Sending frame SpinelFrame(header=SpinelHeader(transaction_id=0, network_link_id=0, flag=2), command_id=<CommandID.RESET: 1>, data=b'\x02')
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Sending data b'~\x80\x01\x02\xea\xf0~'
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Immediately writing b'~\x80\x01\x02\xea\xf0~'
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Sent 7 of 7 bytes
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Event loop woke up reader
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Received b'~\x80\x06\x00p\xeet~'
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Decoded HDLC frame: HDLCLiteFrame(data=b'\x80\x06\x00p')
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Parsed frame SpinelFrame(header=SpinelHeader(transaction_id=0, network_link_id=0, flag=2), command_id=<CommandID.PROP_VALUE_IS: 6>, data=b'\x00p')
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Sending frame SpinelFrame(header=SpinelHeader(transaction_id=3, network_link_id=0, flag=2), command_id=<CommandID.PROP_VALUE_GET: 2>, data=b'\x08')
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Sending data b'~\x83\x02\x08\xbc\x9a~'
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Immediately writing b'~\x83\x02\x08\xbc\x9a~'
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Sent 7 of 7 bytes
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Event loop woke up reader
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Received b'~\x83\x06\x08\\:\xa2\xff\xfe\xbf\x1a`W\xa1~'
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Decoded HDLC frame: HDLCLiteFrame(data=b'\x83\x06\x08\\:\xa2\xff\xfe\xbf\x1a`')
2026-09-15 15:29:43 homeassistant universal_silabs_flasher.spinel[234] DEBUG Parsed frame SpinelFrame(header=SpinelHeader(transaction_id=3, network_link_id=0, flag=2), command_id=<CommandID.PROP_VALUE_IS: 6>, data=b'\x08\\:\xa2\xff\xfe\xbf\x1a`')
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Closing at the request of the application
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Backgrounding a close request: None
2026-09-15 15:29:43 homeassistant zigpy.serial[234] DEBUG Waiting for serial port to close
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Closing connection: None
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Closing file descriptor 7
2026-09-15 15:29:43 homeassistant serialx.descriptor_transport[234] DEBUG Calling protocol `connection_lost` with exc=None
2026-09-15 15:29:43 homeassistant zigpy.serial[234] DEBUG Connection lost: None
Settings file /data/thread/0_5c3aa2fffebf1a60.data is not a valid OTBR settings file, skipping
No existing settings files found, skipping
[15:29:44] INFO: Starting otbr-agent...
[NOTE]-AGENT---: Running 0.3.0-337711e7
[NOTE]-AGENT---: Thread version: 1.4.0
[NOTE]-AGENT---: Thread interface: wpan0
[NOTE]-AGENT---: Radio URL: spinel+hdlc+uart:///dev/serial/by-id/usb-Nabu_Casa_ZBT-2_441BF6857E98-if00?uart-baudrate=460800&uart-flow-control
[NOTE]-AGENT---: Radio URL: trel://end0
[NOTE]-ILS-----: Infra link selected: end0
00:00:00.000 [C] P-RadioSpinel-: RCP => [C] Platform------: Reset info: 0x3 (EXT)
00:00:00.000 [C] P-RadioSpinel-: RCP => [C] Platform------: Extended Reset info: 0x301 (PIN)
[WARN]-UTILS---: /usr/src/ot-br-posix/src/rest/network_diag_handler.cpp:1302 lacking some attributes for deviceId be445b17cd433f7f
[WARN]-UTILS---: /usr/src/ot-br-posix/src/rest/network_diag_handler.cpp:1246 cannot get LeaderData while detached
[WARN]-UTILS---: /usr/src/ot-br-posix/src/rest/rest_devices_coll.cpp:232 - AddItem - be445b17cd433f7f
[WARN]-REST----: REST server failed to start on 172.30.32.1:8081
00:00:00.052 [W] P-Netif-------: Failed to process request#2: No such process
Connection to 172.30.32.1 8081 port [tcp/tproxy] succeeded!
s6-rc: info: service otbr-agent successfully started
s6-rc: info: service otbr-agent-configure: starting
Done
[15:29:44] INFO: Setting OpenThread mDNS local hostname to homeassistant-otbr.
Done
Done
Done
s6-rc: info: service otbr-agent-configure successfully started
s6-rc: info: service otbr-agent-rest-discovery: starting
00:00:00.469 [W] P-Daemon------: Daemon read: Connection reset by peer
[15:29:44] INFO: Successfully sent discovery information to Home Assistant.
s6-rc: info: service otbr-agent-rest-discovery successfully started
s6-rc: info: service legacy-services: starting
s6-rc: info: service legacy-services successfully started
2

That’s the docker network, completely normal. Have you enabled ipv6?

3

Hi,
yes, it was automatically enabled:
Bildschirmfoto 2026-09-16 um 08.42.04

Regarding your docker comment. As I didn’t explicitly use docker. Am I right, that HA uses docker internally e.g. for add-ons?
Regards

4

Correct. HAOS apps are just docker containers managed by the supervisor.

1 Like
5

Any further ideas from someone regarding my problem?
In addition i see as soon as I connect the zbt-2 it breaks down my zigbee connections. Isn’t it possible that zigbee and matter coexist? Antennas ZBT-2 and Conbee I have round about 50 cm distance

6

There shouldn’t be any problem having Zigbee and Matter running simultanously. I haven’t used Deconz in many years, so I am quite rusty. Can you check if you see anything in the logs? If Zigbee breaks when you enable Matter I’m thinking there is a misconfiguration somewhere.

7

What about Step 7?

8

Manual says: " You will now see a Home Assistant OpenThread Border Router."
But I don’t see it in this dialog, only “no preferred network”. There I get stucked

9

There is something, unfortunately I don’t know what it is, that seems way off, which suggests to be the install has a flaw somewhere.

The OTBR Log shows:
[15:29:44] INFO: Setting OpenThread mDNS local hostname to homeassistant-otbr.

which means that the OTBR is sending mDNS advertisements out, and this is what the Thread Integration receives and uses to show what Thread Border Routers it sees. From what I understand, your Thread Integration is not showing any Thread Border Routers. If you installed this HA with HAOS, then these advertisements should show up.

10

Fixed.
The also installed deconz/phoscon listen also on port 8081. Switched deconz to another port. After HA restart I got a new/default matter network, which I can set as default.
Thx to all

11

Hmm, can I mark this as closed/fixed?