I'm looking for the best way to emulate USB devices that are plugged into a Pi zero and connected to another Pi zero through GPIO pins, so the second Pi zero will emulate the actual device that is plugged into the first Pi zero. Could I do this using some sort of SPI interface, or maybe something like libusb or libusb_vhci? I've been researching it a bit, I'm just a little confused & don't know the best route to take...any help would be appreciated :)

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    you may be searching for the wrong thing ..... it is not emulation, it is more of a redirection ..... google usb over ethernet – jsotola Mar 17 '19 at 5:47

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