Method makePortId

android/src/UsbSerialHelper.java:100–110

(UsbDevice device, int iface,
                                   boolean withSerialNumber)

  }

  private static String makePortId(UsbDevice device, int iface,
                                   boolean withSerialNumber) {
    String id = makeDeviceId(device, withSerialNumber);

    if (iface > 0)
      /* a secondary interface on the same device: append the
         interface index */
      id += "#" + iface;

    return id;
  }

  final class UsbDeviceInterface {
    public final UsbDevice device;