The nRF52840 DK is the recommend development kit, it emulates the nRF52811, and can be used as a starting point for development before moving over to a custom board. Please note that this development kit does not support Bluetooth Direction Finding" I read this from a nRF52 datasheet. I would like to find out what restrictions are in the nRF52840DK that I could not use it to prototype a Direction Finding application. Is there anywhere I can go around it still using nRF52840DK?