Hi,
I am starting to see many of my matter devices is offline/unavailable.
Its both on the Nanoleaf and Ikea apps that it seems to go “offline”
Do anyone have some idea where I should look to maybe see if its a HP23 issue with Matter devices since IKEA is the new addon to this.
Are any Matter devices without an app affected as well? (to rule our possible app issues).
Do you use zigbee devices with Homey as well?
If true, how many?
Did you (temporary) replace the power unit and USB-C cable already?
While both Ikea and Nanoleaf use Matter-over-Thread, it might be a an interference issue:
Homeys’ Thread and zigbee use the same chip (called Multiprotocol), AND they use the same frequency band as 2.4GHz wifi.
You should be able to view and possibly change the Thread channel here or here.
Wifi 2.4GHz should be set to preferrably channel 1 or 6 or 11.
If it"s not possible to change the Thread channel, you’d change the wifi channel, to separate it from the used Thread/zigbee channel
I have the same problem. All my Ikea Matter lamps are no longer accessible after today’s Homey Pro update (12.10.1).
When attempting to repair, no connection can be established via Matter.
A good practice after a firmware update which causes (weird) issues: cut the power for 10 minutes, and try again.
Unfortunately, Matter devices are still unreliable. Often, various devices do not function properly (e.g., plugs do not display energy consumption). Some devices do not function at all.
As things stand today, I can only recommend that everyone refrain from using Matter if possible. If you do use Matter, please ask in the forum whether anyone has experience with the device and whether it really works.
Otherwise, I agree with Peter’s opinion. A restart/PTP often improves the situation.
Same here…
@Undertaker : If no one used Matter devices, then Athom wouldn’t be able to improve anything either. 
However, it is very frustrating for users to spend a lot of money on devices only to discover that they do not work, or only work partially. It is not always Homey’s fault. It does not work any better on Home Assistant.
It’s better to fall back on the tried and tested wireless standards that work well.
I’ve been working with Matter for a long time. Apart from not needing an app, I haven’t been able to identify any advantages yet. Being a beta tester for Athom is not our job.
all my TAPO matter devices are also offline after the update and can’t “repair” them 
in the TAPO app they are working fine
Everyone Is A Tester™
I agree with you to some extent, but I also think that everyone is old enough and should inform themselves beforehand.
Anyone who simply wants a functioning smart home should choose technologies that work. But if you want something experimental, you can choose something different and gain experience. As you yourself write, it’s not always Homey’s fault. For example, I have two Matter light bulbs from Aqara, which still work perfectly after the update, but the FP300 multisensor does not…
Yes, it’s not our job to be testers for Athom, but you enjoy tinkering and testing, don’t you?
I also like to test things and try new things to gain experience…
Just throwing in my Matter over Thread experiences from the last days/weeks:
I am using HomePods/minis + AppleTV as basis for Thread. Homey SHS uses this network from the beginning, also Ikea’s Dirigera Hub and Aqara’s M3 hub joined – nice so far.
Adding any Matter over Thread device in any possible way (first setup in Apple Home, Aqara, Ikea or Homey), then adding it to other platforms using the temporary pairing code generated in the platform’s apps leads to a stable connection in every platform, except Homey.
Hours/days later, the devices appear offline in Homey, but still work on all other platforms.
I’ve noticed now:
Viewing the Thread network details in the Aqara app from an in Homey offline shown device reactivates it.
So for example just reading all Thread network stats from an Aqara Door/Window Sensor P2, that went offline in Homey, is online and working fine after this procedure (give it 30-60 minutes). Now they’re all online for about 1–2 days. We’ll see, if they stay online or if I have to repeat this procedure from time to time.
Side note:
WiFi on ch. 9 – Thread on ch. 25 – Zigbee-Bridges on ch. 11 (Hue) and 15 (Aqara) and one unknown one (Ikea).
2 Aqara Door/Window Sensor P2, 1 Aqara Door Lock U200, 1 Ikea Klippbok water sensor. (Had about 20 more Matter over Thread devices from Ikea but removed them during this annoying process. Maybe I’ll try to add them later again.)
Homey SHS on Raspi 5.
The LAN connected Matter-Zigbee bridges (Dirigera, M3) work fine.
Hi Peter,
Thanks for the reply, and sorry for be a bit late for the reply. 
Question 1:
Matter: In total is there 17 matter devices. 3 devices is from Nanoleaf and are NL54 GU10 bulps. 1 of those is not always connected to power. But it have never been an issue.
The rest of my Matter devices is from IKEA, and none of them was connected from the app when they were connected, cause the app just got updated a couple of days later. So yes my IKEA matter devices are not connected from the app. (yet)
Question 2:
I have in total 51 zigbee devices. 27 of those is zigbee router devices.
None of those were “offline” when I had the issue.
Question 3:
After you mentioned the power+cable I have tried another power supply+cable. And this was still the same. I had yesterday switch to a POE injector to see if his will bring any issues, so far still working.
Question 4:
I could see your idea with the interference issue. I have used Homey for 1 year now, and so far, its the first time i experince this issue. We’re living in an apartment building, so there is a lot of wireless in the area.
Homey is using zigbee channel 15.
From your Homey dev link to Matter I could not see/change any channels regarding Matter channels.
If I could disable WiFi while LAN is detected, they could maybe be less interference.
When I see the outage of some of the matter devices, it was not all. Some Ikea like ALPSTUGA and one of the TIMMERFLOTTE was still online with the Nanoleaf rest was “offline”.
As I side note, I bought my first Ikea matter devices 11 december, and added those direct and not from the Ikea app.
I then added a device more 27/12, and the last was added 3 januar. After that I also posted a suggest to the Ikea app to update it.
And as you could see in the changelog, Athom updated the app 7 januar.
Regards Ulrik
From what I remember it’s possible in setup mode.
Combined with Matter-over-Thread, it can work fine, it can be (very) flaky → it’s not recommended (by others, like, Home Assistant) to use both Matter-over-Thread & zigbee with a so called multiprotocol device like Homey uses;
Homey uses one chip for both, you can imagine one of the two protocols “loses” the battle, or maybe even devices of both protocols.
When you’re planning to expand your Matter-over-Thread devices, I would consider moving zigbee completely to f.i. zigbee2mqtt when the flakyness can’t be fixed by fine turning.
Thanks again for the fast reply Peter.
The only way I found was from the web playground api, here I could run homey.system and disable/enable wifi. But that one dont allow the HomeyScript. So all manuel work.
Really crap that the HP23 had one chip for both. I have actually bought a SM light MR3 device, that have more chips. But Its not setup yet in min HP23.
Its kind of nice to hear the issue could be caused of I have both zigbee and Matter.
Let me hear if there is something more that I should test.
An update regarding the power to the Homey. Since I have switcher over to the POE injector that is not the default one. It have actually been stable.
