Built-in RaspberryPi WiFi can do monitor mode. Kali Linux even has a raspberry pi image. RaspberryPi also has built in Bluetooth that supports 4.1 and low energy. Since Bluetooth is a less powerful signal, is there anything I could do with that?
I didn't know the onboard adapter supported monitor mode, that is ligitmately useful knownledge for me. Thanks, it should be simple to build your own sniffer to just plan around with. Carefull if you are in the EU though, not that it is removely possible to catch a silent sniffer.