Arthur, how do you get Droidplanner setup and working in the first place if there is no way to configure the USB port? When I try to connect using my Android Mini PC all I get is an error saying “Mavlink error, no devices found”.
Did you plug in the telem radio to the port? It should then ask you if you want to let DP use it which of course you say yes. DP defaults to usb so there’s really nothing to configure on that.
I finally got it working after flashing the radios with new firmware.