@Override
        public void setBreak(boolean value) throws IOException {
            setConfigSingle(SILABSER_SET_BREAK_REQUEST_CODE, value ? 1 : 0);
        }
emulate external XON/OFF
@throws IOException
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Cp21xxSerialDriver.java