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You're not limited to the Aranet4 app. The device speaks Bluetooth and there are Python and Go libraries for parsing the protocol. There is also a Prometheus exporter for it.

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Home Assistant already has an integration to read from it as well.

You will need a BT -> HA relay, but you can do that with any ESP32 board and ESPHome.

I'm running hass on a raspberry pi 4 and its built-in bluetooth works fine, no extra setup needed.

Only for huge distances. I have mine connected directly to the BT of the mini pc I use to host HA.

Yeah, I'm running HA on the server that I use for all home services, so I needed the BT relay.

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