@SuppressWarnings({"unused"})
    public static Map<Integer, int[]> getSupportedDevices() {
        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<>();
        supportedDevices.put(UsbId.VENDOR_SILABS,
                new int[] {
            UsbId.SILABS_CP2102, // same ID for CP2101, CP2103, CP2104, CP2109
            UsbId.SILABS_CP2105,
            UsbId.SILABS_CP2108,
        });
        return supportedDevices;
    }
emulate external XON/OFF
@throws IOException
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Cp21xxSerialDriver.java