Sure you aren't thinking of the Model A and Zero? The B and B+ have a USB hub & ethernet adapter, but no OTG or USB device ports exposed. It's kind of tricky

Sure you aren't thinking of the Model A and Zero? The B and B+ have a USB hub & ethernet adapter, but no OTG or USB device ports exposed. It's kind of tricky to use the A and Zero's USB device port but people have been figuring it out recently: https://learn.adafruit.com/turning-your-raspberry-pi-zero-into-a-usb-gadget https://learn.adafruit.com/turning-your-raspberry-pi-zero-in... Check out the Beaglebone Black too, it has a USB device and host port and its kernel is all setup to use the USB gadget kernel modules. By default it uses the g_multi module to make its USB device port look like a USB storage and ethernet adapter, but you can modify it to use any other USB gadget driver, GadgetFS, etc.