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The era of open voice assistants has arrived - Home Assistant
(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. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
It's USB-C, there are POE adapters. It's low wattage using an esp32, you could absolutely use a USB c poe splitter for this.
That solves only power, not Ethernet.