sbuf[i] = sbuf[i + 1];
            }
            int b;
            if ((b = in.read()) == -1) return null;
            sbuf[35] = (byte)b;
        }

        key.mid = Encdec.dec_uint16le( sbuf, 34 ) & 0xFFFF;

        /* Unless key returned is null or invalid Transport.loop() always
         * calls doRecv() after and no one else but the transport thread