void etx_handle_beacon(ipv6_addr_t *candidate_address)
{
/*
* Handle the ETX probe that has been received and update all infos.
* If the candidate address is unknown, try to add it to my struct.
*/
DEBUG(
"ETX beacon package received with following values:\n"
"\tPackage Option:%x\n"
"\t Data Length:%u\n"
"\tSource Address:%d\n\n", etx_rec_buf[ETX_PKT_OPT], etx_rec_buf[ETX_PKT_LEN],
candidate_address->uint8[ETX_IPV6_LAST_BYTE]);
etx_neighbor_t *candidate = etx_find_candidate(candidate_address);
if (candidate == NULL) {
//Candidate was not found in my list, I should add it
candidate = etx_add_candidate(candidate_address);
if (candidate == NULL) {
DEBUGF("[ERROR] Candidate could not get added\n");
DEBUG("Increase the constant ETX_MAX_CANDIDATE_NEIHGBORS\n");
return;
}
}
//I have received 1 packet from this candidate in this round
//This value will be reset by etx_update to 0
candidate->tx_cur_round = 1;
// If i find my address in this probe, update the packet_rx value for
// this candidate.
etx_probe_t *rec_pkt = etx_get_rec_buf();
for (uint8_t i = 0; i < rec_pkt->length / ETX_TUPLE_SIZE; i++) {
DEBUG("\tIPv6 short Addr:%u\n"
"\tPackets f. Addr:%u\n\n", rec_pkt->data[i * ETX_TUPLE_SIZE],
rec_pkt->data[i * ETX_TUPLE_SIZE + ETX_PKT_REC_OFFSET]);
if (rec_pkt->data[i * ETX_TUPLE_SIZE]
== own_address->uint8[ETX_IPV6_LAST_BYTE]) {
candidate->packets_rx = rec_pkt->data[i * ETX_TUPLE_SIZE
+ ETX_PKT_REC_OFFSET];
}
}
//Last, update the ETX value for this candidate
etx_update(candidate);
}
double etx_get_metric(ipv6_addr_t * address) {
etx_neighbor_t * candidate = etx_find_candidate(address);
if (candidate != NULL ) {
if (etx_count_packet_tx(candidate) > 0) {
//this means the current etx_value is not outdated
return candidate->cur_etx;
} else {
//The last time I received a packet is too long ago to give a
//good estimate of the etx value
return 0;
}
}
return 0;
}