Linux

Linux has a built-in USB/IP client - the vhci-hcd virtual host controller - so a USBIP virtual device imported into the kernel behaves exactly like real hardware.

Your program is the USB/IP server here: it listens, and usbip attach is the client that connects to it.

sudo modprobe vhci-hcd                       # load the virtual HCD (once per boot)
sudo usbip attach -r 127.0.0.1 -b 1-1        # import the device served on :3240