There are simple and cheap USB dongles that can detect 868 MHz devices. I got myself a "nanoCUL" for this purpose.
This consists of an Arduino Nano and a Texas Instruments CC1101 radio chip which can be connected to a PC via USB.
There are several firmware projects for the dongle. SignalDuino, culfw, a-culfw, ...
I tried them all but unfortunately the protocol is not supported. So I must dig deeper here.
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