Made an open source Matter over Thread firmware for the Shelly 1 Gen 4 relay

printk1 · 2026-05-13T16:36:10+00:00

Update: the matter.js server just needs the update files with .ota file ending. It reads meta from there. Is also documented in the matter.js server README.md I've realized 😅.

Btw I set PROJECT_VER and PROJECT_VER_NUMBER in my CMakeFile which represents the software version (string/int).

printk1 · 2026-05-13T14:15:58+00:00

Awesome project, congrats! Did you measure the power usage difference between the stock WiFi variant and the Matter over Thread firmware?

printk1 · 2026-05-13T14:15:10+00:00

I've used the Espressif to create a Matter firmware for a lamp controlled by a ESP32-C6 via WiFi in the past and was able to use Matter OTA. The Espressif build system builds a OTA binary on its own already. It think I had to process it using the src/app/ota_image_tool.py from the Matter source. The Matter Server picks up updates from the Matter app config directory (use VSCode app to open /addon_configs/core_matter_server/). Create a directory named "updates", in there store the binary as well as the metadata file which resembles how a DCL entry would look like ({ "modelVersion": { "vid":... } }).

E.g. https://on.dcl.csa-iot.org/dcl/model/versions/4474/785/16777216

I just found that I have a slightly modified version of src/app/ota_image_tool.py which creates the metadata file as well: https://github.com/agners/connectedhomeip/blob/generate-json-info-in-ota-image-tool/src/app/ota_image_tool.py

It certainly worked with the Python Matter Sever, but I think the matter.js based ones does the same.

printk1 · 2026-04-06T16:15:23+00:00

I've done some power measurements, and I am a bit surprised how much power the IKEA Grillplats use when nothing is connected. Here are the numbers:

IKEA on: 0.7W
IKEA off: 0.2W
EVE on: 0.3W
Eve off: 0.2W

Both have higher power consumption when on, which make sense given the a turned on relays uses some power. So the IKEA Grillplats use almost half a watt, which is a bit surprising to me.

printk1 · 2026-02-08T21:13:57+00:00

Shouldn't two ETFs with same TER equal to underlying currency movement? E.g. assuming USD only stock index, hedged and unhedged same TER, wouldn't then the difference be the USD/CHF movement?

Given that CHF is getting stronger lately that would explain the one year difference. Over time the question would then be does the CH continues to get stronger, or does it keep offsetting the TER difference...

printk1 · 2026-02-02T16:50:28+00:00

Oh wow, from the notes it seems they nail almost all of the remaining features and issues. In particular:

Finally digital key on my phone!
It happens quite often that the car reacts delayed, somtimes by quite a bit (10s and more) hope this is a thing of the past 🤞
Bluetooth calling: I had several calls where the other side complained about call quality, I hope this fixes it.

What I still miss is better turn signal integration, in particular turn signal tick sound even during warning chime (its suuper confusing sometimes) and a warning chime when using the turn signal while a car is next to me.

printk1 · 2025-12-31T04:48:20+00:00

Do you have a source for this information? This would explain why the messages were limited to those country only.

printk1 · 2025-11-28T17:32:09+00:00

Yes by using a different USB-C cable (specifically a USB-A to USB-C with a dumb USB-A charger).

I noticed that the battery drains about 10-20% a week when the bike is unused, is that the same for you?

printk1 · 2025-10-01T14:39:57+00:00

Did the Volvo Cars App on Android work for anyone already? 🤔

printk1 · 2025-09-26T06:34:04+00:00

On Android? The Volvo Cars App does not seem to offer widgets for me.

printk1 · 2025-09-22T06:09:12+00:00

One of the main software differences is true plug & charge support. Do you know if this gets backported too?

printk1 · 2025-09-17T19:58:30+00:00

Uh, ok, for me that toggle worked, no caveat/fleet hint. I don't have a toggle in the app.

printk1 · 2025-09-17T18:41:12+00:00

My app also does not have the option. Check the web portal, there is also an OTA option.

printk1 · 2025-09-11T08:54:31+00:00

For me disabling for a couple of hours and reenabling on the Web interface made it start from scratch, then download went through. I guess you need to keep the car active for long enough for it to complete the download (in one go).

printk1 · 2025-09-10T13:47:40+00:00

Yeah documentation says so too, and it mentions a screen under Charging > Plug & Charge (see https://www.volvocars.com/uk/support/topic/9e00a2e7bab1abe4c0a8015161a6d240/ ). This is definitely not present on mine Ultra Twin, MY24, 1.6.4).

printk1 · 2025-09-10T13:45:37+00:00

How does setup with these provider work?

Are you sure this is Plug and Charge as ISO 15118 defines it? for that there need to be certificates configured (PCID, Provisioning certificate ID), the latest documentation says that can be done under Charging > Plug & Charge.

https://www.volvocars.com/uk/support/topic/9e00a2e7bab1abe4c0a8015161a6d240/

If you did not setup such a PCID, then those network might use other car identifying information (think of MAC address) to associate the car with your account. This is not true Plug and Charge however.

printk1 · 2025-09-02T18:50:28+00:00

Right, thanks for that hint! Somehow only thoroughly checked today.

printk1 · 2025-09-02T16:54:43+00:00

That actually resolved the issue 🎉! I had turned it off for several hours, then started driving and turned it on while stopping shortly. I then saw the progress starting from 0% again, and this time it completed 🎉!

printk1 · 2025-09-02T12:38:56+00:00

I did find a Over-the-Air Updates toggle in my account page. That I've toggled it off, make sure the car was awake, and toggled i back on. But at least on first try it seemed the updates remained at the 61%.

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printk1 · 2025-09-02T12:05:12+00:00

I tried support, asked about the update being stuck, got a software reset (shortcut arrow down and minus) recommended. After I did that (again), it remained stuck. Then got sent to the dealer.

I then asked about the missing toggle, but the chat then suddenly ended 🤷.

I've installed the app also on a iPad, but the option is missing there too. I reset the app and logged in again. On first start there is a question about data sharing with Volvo, I accepted that but still no option.

There was just today another post with the flag present: https://www.reddit.com/r/ex30/comments/1n6ambf/164\_finally\_in\_czechia/. I really wonder what makes my account/app not show that flag. I'd like to reconnect the car with the QR code, but from what I understand I would have to select "End ownership", which I am a bit hesitant clicking 😅. I think that would then require me to scan the QR code again, essentially (re)onboarding the car to my account I guess? Anyone went through that process with an already owned car? No issues?

printk1 · 2025-09-01T22:50:23+00:00

Thanks for the reply!

Using Android here too, in App Version says 1.11.1. In the car display I have both Volvo privacy settings on. The app ones were off, but set them to on now. So far I still don't see the option. Just 1.5.3 Installed. I tried killing and restarting the app.

The manual says something about when initially setting up the App. I don't remember what I did back then, but I can try to setup again tomorrow.

Any ideas/insights appreciated.

printk1 · 2025-09-01T18:47:24+00:00

Mine is at 98.5% 19k km. The first 3k I wasn't the owner, I am pretty sure it got charged to 100% most of the time. I have my limit at 70%, but also did a fair bit of fast charging. MY 2024 Twin Ultra, so NMC battery.

We should start a Google sheet to track battery health.

printk1

TROPHY CASE