stuff.java

    /**
     * Set specified configuration as active for given device using low-level api
     */
    public static void setActiveConfiguration(UsbDevice device, UsbConfiguration cfg) throws LibUsbException {
        DeviceList list = new DeviceList();
        LibUsb.getDeviceList(null, list);

        try {
            for (Device d : list) {
                DeviceDescriptor descriptor = new DeviceDescriptor();
                LibUsb.getDeviceDescriptor(d, descriptor);
                if (descriptor.idVendor() == device.getUsbDeviceDescriptor().idVendor() &&
                        descriptor.idProduct() == device.getUsbDeviceDescriptor().idProduct()) {
                    Context context = new Context();
                    LibUsb.init(context);
                    DeviceHandle handle = new DeviceHandle();
                    LibUsb.open(d, handle);
                    LibUsb.setConfiguration(handle, cfg.getUsbConfigurationDescriptor().bConfigurationValue());
                    LibUsb.close(handle);
                    LibUsb.exit(context);
                    return;
                }
            }
        } finally { LibUsb.freeDeviceList(list, true); }
    }