Before this is possible, we'd need a USB HID driver, which doesn't seem to exist on the PSTV just yet. There is a USB Mass Storage driver however, and a Bluetooth HID driver, so perhaps you should look into Bluetooth peripherals.
8BitDo controllers are a definite maybe, the NES30 Pro (which I own) had a firmware update that added PS3 support. It's possible that you could pair the NES30 Pro with a PSTV, since AFAIK most third party DS3 controllers work fine with it.
Unfortunately, I don't own a PSTV or know anyone who does locally, so I wouldn't be able to test it for sure.
it does work in the PSTV OS and in retroarch emulators ,it saw the stick as second player in neogeo games, i didn't test turning off the ps3 controller to make arcade stick number 1, but I'm sure it can be done
it does work in the PSTV OS and in retroarch emulators ,it saw the stick as second player in neogeo games, i didn't test turning off the ps3 controller to make arcade stick number 1, but I'm sure it can be done
Actually, that does make sense. If the PSTV didn't have a USB HID driver, it couldn't sync the PS3 and PS4 controllers. I didn't even think of that. Awesome that it does work though!