How to listen quietly for other Bluetooth devices?

[Mikhail T.]

On 08.07.2017 23:22, Maksim Yevmenkin wrote:
> i'm not aware (not have i ever seen) of-the-shelf bluetooth dongle that is capable of going into "promiscuous" mode.

Thank you, Max, for sharing your expertise... So, you are saying, the 
decision on whether to notify the host of a particular bit of traffic 
the dongle "hears" is controlled by the hard-coded logic on the dongle 
itself -- and can not be reprogrammed by the host?

Sad... Maybe, I will have to "broadcast" something in order to register 
responses.

    -mi