new_contents: import usb
  
  dev = usb.core.find(idVendor=0x0456,idProduct=0xcee2)
  dev.set_interface_altsetting(0,1)
  dev.get_active_configuration()[(0,1)][1].write([10]*511)
  x = dev.get_active_configuration()[(0,1)][0].read(1024)
  print x[0], len(x)
  dev.ctrl_transfer(0xc0, 0x01, 0, 0, 1)
  
subject: add working pyusb bulk loopback test code