I tested the USB OTG functionality using an OTG cable, I even tried an externally powered USB OTG cable ( works on my Boox C67ML) and a powered USB hub connected with an USB cable with the OTG pin lifted (works with my Chuwi Android/Win10 tablet). I also tried the USB-C audio dongle by Apple, which is supposed to work with Android devices as well. Nothing seems to be working. I am only getting an Earphone indicator at the top bar if I connect the Apple audio dongle or the USB-C hub (docking station that works with a Samsung Android phone), but there is no audio out and Linux kernel reports no device detected.
Is it possible to provide support for the USB OTG on the Nova? I suppose it should be possible if it worked on the cheap C67ML. Having the USB audio with audio quality not crippled by the bluetooth bandwidth would be great, and having the serial port over USB would be great for some apps as well.