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10 sats \ 0 replies \ @nullama OP 10 Jan \ parent \ on: Meet Ruuvi, an open source bluetooth sensor (temp, humidity, and more) opensource
Yes, it is a bluetooth device.
They have many repositories in their github account, including the source for the apk, but also they have the code for the web interface as well.
They provide a gateway service, but as far as I can tell, you should be able to run it all on your own network using their source code.