/* 2 bytes checksum */
if (WITH_CHECKSUM) {
cc2420Data[pos++] = (byte) (contikiCRC & 0xff);
cc2420CRC.addBitrev(contikiCRC & 0xFF);
cc2420Data[pos++] = (byte) ((contikiCRC >> 8) & 0xff);
cc2420CRC.addBitrev((contikiCRC >> 8) & 0xFF);
}
/* (TODO) 3 bytes timestamp */
if (WITH_TIMESTAMP) {
cc2420Data[pos++] = 0;