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Home Assistant officially Matters
(www.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first.
Powered by a worldwide community of tinkerers and DIY enthusiasts.
Home Assistant can be self-installed on ProxMox, Raspberry Pi, or even purchased pre-installed: Home Assistant: Installation
Discussion of Home-Assistant adjacent topics is absolutely fine, within reason.
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You can flash the Sonoff Zigbee Dongle-E to turn into a Thread antenna using OpenThread RCP. So you can run Matter over Thread. This dongle cost less than $30 on AliExpress.
https://darkxst.github.io/silabs-firmware-builder/
I’ve connected my Nuki smart lock via this dongle. Though I’m preferring to use the MQTT over Thread implementation for this lock. Since it broadcasts more information over MQTT than with the Matter integration.