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[nRF52840] USB Vendor Specified Interface Class

Hello,

I would like to implement a Vendor Specified Interface Class for use with libusb on the nRF52840 USB. There are examples of HID, CDC, Audio, etc. But it is not clear to me how to define my own class. Basically, I would like to configure one interface, where I set the bInterfaceClass to 0xFF, and have one bulk IN endpoint, and one bulk OUT endpoint.

I've been trying to fill some struct to give to app_usbd_class_append(), but I can't really figure out what to put there.

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