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The original was posted on /r/homeassistant by /u/xxpapertigersxx on 2026-05-09 17:52:13+00:00.
I made an open source Matter over Thread firmware for the Shelly 1 Gen 4.
Shelly said they likely won't add the feature via firmware update, offering Matter over Wifi instead. So I spent a chunk of time figuring it out for my off grid Sprinter van setup.
I have these little relays commissioned to both HA using the Matter integration and Apple Home simultaneously, all humming along as on/off devices for lights using Matter over Thread - both commissioned separately without a HomeKit bridge. What started this journey mainly surrounded requirements related to having a low infrastructure smart home on wheels where wifi isn't exactly the most reliable or power conscious option I wanted to go with on a mainly 12v solar/battery system.
Hope this helps someone else out like it did for me. It's fully reversible if you back up the stock firmware. Could even go ESPHome direction if you want OpenThread and don't care too much about the Matter protocol side of it.