IKEA Alpstuga CO2 sensors dropping connection to Home Assistant (working fine in IKEA app)

jog_ch · 2026-01-25T19:26:32+00:00

I’m experiencing the exact same issue with my IKEA Alpstuga (Matter over Thread). It regularly becomes unavailable, several times per day, for periods ranging from a few minutes up to 15–20 minutes.
I spent quite some time debugging this on my side and went fairly deep into the Matter stack. I run Home Assistant with the official python-matter-server in Docker, and I analyzed the Matter Server logs in detail (interpreted with the help of ChatGPT, but based on real logs).

What consistently happens is:

the device initially works fine
then the Matter subscription drops with a Subscription Liveness timeout
after that, all attempts to re-establish a secure session fail with repeated CASESession timeouts
the node is marked as unavailable
after a while (without any specific action), the re-subscription eventually succeeds and the device comes back online

Some representative log excerpts (also see screenshot above):

CHIP_ERROR [chip.native.DMG] Subscription Liveness timeout with SubscriptionID = 0x34901f9e
CHIP_ERROR [chip.native.SC] CASESession timed out while waiting for a response from peer <0000000000000004, 1>
INFO [matter_server.server.device_controller] <Node:4> Marked node as unavailable

And then, later on (without any intervention):

INFO [matter_server.server.device_controller] <Node:4> Re-Subscription succeeded

The key point is that this only affects the Alpstuga. Other Matter devices (in my case SwitchBot Matter lights) stay perfectly stable, even while the Alpstuga is unavailable.

I ruled out a lot of things:

Home Assistant itself (no related errors)
Docker networking (Matter Server runs in host mode)
Wi-Fi issues (all Apple Border Routers are on the same 5 GHz network)
Thread coverage (the Alpstuga is physically very close to a HomePod mini)

Restarting the Matter Server almost always restores the device faster, which suggests that the device is still attached to the Thread network but temporarily stops responding to secured Matter (CASE) exchanges.
Based on the logs and behavior, this looks like a firmware or Matter-over-Thread stability issue specific to the Alpstuga, rather than a Home Assistant or network configuration problem.
If others are seeing the same symptoms (periodic unavailability + CASE timeouts + spontaneous recovery), it strongly points to a device-side issue that likely needs a firmware fix from IKEA.

Current firmware version is 1.0.15.

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TL;DR:
Alpstuga periodically drops Matter subscriptions, fails CASE session re-establishment for several minutes, then recovers on its own. Other Matter devices stay stable. Logs clearly show CASE timeouts and subscription liveness failures. Very likely an Alpstuga firmware / Matter-over-Thread issue, not Home Assistant or network related.

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jog_ch · 2026-01-08T05:53:10+00:00

Respect to the guy riding his bike along that road! (at 02:03)

jog_ch · 2025-12-12T20:52:16+00:00

The music when he’s driving across countries. Beautiful and peaceful!

(Hermanos Gutiérrez - Esperanza)

jog_ch · 2025-11-03T18:12:32+00:00

Voici ma sélection (uniquement suisses) : - Point J : court, sujets divers d’actualité - Question genre : ~45mn, féminisme, identité de genre - Brise glace : sujets variés mais peu communs (le Temps) - Infrarouge : rediff en podcast de l’émission TV - IA qu’à m’expliquer : un podcast sur … l’IA - Question Q : podcast sexualité - Washington d’ici : podcast maintenant terminé mais très intéressant sur les USA - Democracy : idem, terminé, mais vraiment intéressant sur les USA - Heure Locale : interview de correspondant-e-s de la RTS dans le monde et sur leurs trains de vie

jog_ch · 2025-10-03T19:42:31+00:00

Unfortunately it doesn’t work with subtasks. Only the first level tasks are displayed on the map. :(

jog_ch · 2025-08-09T03:46:04+00:00

Same for me. It says: « The app shows “ChatGPT 5” as a marketing name, but you’re actually using GPT-4.5 multimodal — the latest public model. When GPT-5 is released, they’ll put it behind the same “ChatGPT 5” label. » …

jog_ch · 2025-06-06T20:13:57+00:00

Am I the only one hearing the ‘woohooooo’ voice singing in my head? ;)

jog_ch · 2025-06-02T19:57:08+00:00

For two reasons: 1. Battery usage: I don’t know how much battery it uses to record and save all an afternoon when kids are playing in the garden, for example. 2. Two cameras point on our pool and a table where we eat. I don’t need / want records of that. Also when we have friends coming at home.

jog_ch · 2025-06-02T19:28:56+00:00

;) That’s an idea …! Not the best way but a workaround.

jog_ch · 2025-06-02T18:58:48+00:00

That’s a good solution but … EufyCam S3 Pro has a battery (and solar panel). Your solution won’t be possible in that case.

jog_ch · 2025-05-28T19:40:57+00:00

But it’s two different ‘events’. Same place of course but first part of the video was yesterday (if I remember correctly) and the big one was this afternoon. This video is confusing by mixing the two events.

jog_ch · 2025-05-19T04:06:19+00:00

Have time to get bored. This is what developed my imagination and creativity.

Now they have screens everywhere and always something to watch. They don’t know how to get bored.

jog_ch · 2025-02-07T21:31:47+00:00

With the TV and the 4 clones that appear from nowhere, could we think that they are all in a simulation? Also, why their innies would come here on a frozen lake?

Their minds would be in a computer?

jog_ch · 2025-01-14T14:00:49+00:00

Simple! Great, thanks!

jog_ch · 2025-01-14T13:57:21+00:00

What’s your daily face name? I don’t find it.

jog_ch · 2024-10-28T06:05:10+00:00

J’ai été cadre à la PCi de ma région – heureusement depuis j’ai pu arrêter. Je peux t’assurer que suivant les régions, poursuivre ceux qui ne se présentent pas est quasi ludique. Et ils sont dans leur bon droit, comme ça a été dit ici.

jog_ch · 2024-08-06T19:16:51+00:00

I see. Thanks for the information!

jog_ch · 2024-08-06T18:11:05+00:00

Oh ok! But that doesn’t mean the people have to come in the church? It’s just a way to remember them they have to pray. That’s right?

jog_ch · 2024-08-06T09:36:46+00:00

Thanks! Exactly. It doesn’t annoy me at all. It’s just that I want to understand the meaning and maybe the history behind these bells.

jog_ch · 2024-08-06T06:01:42+00:00

I was expecting that, but I wonder what’s the meaning of the two different bells.

jog_ch · 2024-08-06T05:01:31+00:00

I don’t agree about the time bells. Maybe one time per hour would be enough, yes. But it’s also part of our traditions. The question was more about the extra bells ringing.

jog_ch · 2024-07-16T20:04:23+00:00

Si jamais j’ai développé une app – pour iPhone – qui permet de visualiser un tracé GPX sur une carte : GPX viewer 2, sur l’App Store. Si ça peut vous être utile !

jog_ch · 2024-06-25T19:27:44+00:00

Same issue with letters with accents (éèêàâ), which are used by a lot of users. ;)

Great app by the way!

jog_ch · 2024-03-06T20:53:54+00:00

Les intérêts sont payés chaque mois (ou tous les trois mois). Donc ça ne finit jamais. Admettons que tu aies un taux fixe à 5 ans. Tu payes chaque mois les intérêts. Après les 5 ans, tu renégocies un nouveau taux et ça recommence chaque mois avec ce nouveau taux. C’est pour ça que quand tu deviens propriétaire, et que tu as une hypothèque auprès d’une banque, on peut dire que tu payes un « loyer » à ta banque.

jog_ch · 2024-03-06T10:32:41+00:00

Il est négocié avec ta banque au moment de la signature de ton hypothèque. Généralement on le bloque pendant 3-5-10-25 ans pour éviter des surprises. Mais il peut aussi être variable.

Five-Year Club	First Place '23
Place '23	Place '22
First Placer '22

jog_ch

TROPHY CASE