SAP: Do not send padding when packet size is mutiple of 4

        /* Payload */

        os.write(value);

        for(int i = 0, n = 4 - (value.length % 4) ; i < n; i++) {

        if (value.length % 4 != 0) {

            for (int i = 0; i < (4 - (value.length % 4)); ++i) {

                os.write(0); // Padding

            }

        }

    }

    public void write(OutputStream os) throws IOException {

        /* Write the header */