static UsbSerialProber getCustomProber() {
        ProbeTable customTable = new ProbeTable();
        customTable.addProduct(0x1234, 0x0001, FtdiSerialDriver.class); // e.g. device with custom VID+PID
        customTable.addProduct(0x1234, 0x0002, FtdiSerialDriver.class); // e.g. device with custom VID+PID
        return new UsbSerialProber(customTable);
    }
add devices here, that are not known to DefaultProber

if the App should auto start for these devices, also
add IDs to app/src/main/res/xml/device_filter.xml
usbSerialExamples/src/main/java/com/hoho/android/usbserial/examples/CustomProber.java