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Can the Bluetooth adapter included in the Raspberry Pi models be put into some sort of "promiscuous" mode -- so that it reports to the host all Bluetooth-activity that it "hears", even if it is not itself part of the conversation?

I'm not trying to break encryption, just want to be aware of any BT-radio activity going on in the device's proximity...

Mikhail T.
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Since there is documentation how to capture Bluetooth traffic with wireshark (or tshark) it might be possible.

Check out this article

Georg Bisseling
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  • For pcap-based methods to work, the communicating devices must have paired already. The article says, for _passive_ capture one has to use [Ubertooth](http://greatscottgadgets.com/ubertoothone/). So, I'm afraid, the answer to my question is "No"... – Mikhail T. Aug 12 '18 at 13:39