/* A periodic process to send TSCH Enhanced Beacons (EB) */
PROCESS_THREAD(tsch_send_eb_process, ev, data)
{
static struct etimer eb_timer;
PROCESS_BEGIN();
/* Wait until association */
etimer_set(&eb_timer, CLOCK_SECOND / 10);
while(!tsch_is_associated) {
PROCESS_WAIT_UNTIL(etimer_expired(&eb_timer));
etimer_reset(&eb_timer);
}
/* Set an initial delay except for coordinator, which should send an EB asap */
if(!tsch_is_coordinator) {
etimer_set(&eb_timer, random_rand() % TSCH_EB_PERIOD);
PROCESS_WAIT_UNTIL(etimer_expired(&eb_timer));
}
while(1) {
unsigned long delay;
if(tsch_is_associated && tsch_current_eb_period > 0) {
/* Enqueue EB only if there isn't already one in queue */
if(tsch_queue_packet_count(&tsch_eb_address) == 0) {
int eb_len;
uint8_t hdr_len = 0;
uint8_t tsch_sync_ie_offset;
/* Prepare the EB packet and schedule it to be sent */
eb_len = tsch_packet_create_eb(&hdr_len, &tsch_sync_ie_offset);
if(eb_len > 0) {
struct tsch_packet *p;
/* Enqueue EB packet */
if(!(p = tsch_queue_add_packet(&tsch_eb_address, NULL, NULL))) {
PRINTF("TSCH:! could not enqueue EB packet\n");
} else {
PRINTF("TSCH: enqueue EB packet %u %u\n", eb_len, hdr_len);
p->tsch_sync_ie_offset = tsch_sync_ie_offset;
p->header_len = hdr_len;
}
}
}
}
if(tsch_current_eb_period > 0) {
/* Next EB transmission with a random delay
* within [tsch_current_eb_period*0.75, tsch_current_eb_period[ */
delay = (tsch_current_eb_period - tsch_current_eb_period / 4)
+ random_rand() % (tsch_current_eb_period / 4);
} else {
delay = TSCH_EB_PERIOD;
}
etimer_set(&eb_timer, delay);
PROCESS_WAIT_UNTIL(etimer_expired(&eb_timer));
}
PROCESS_END();
}
/* A periodic process to send TSCH Enhanced Beacons (EB) */
PROCESS_THREAD(tsch_send_eb_process, ev, data)
{
static struct etimer eb_timer;
PROCESS_BEGIN();
/* Wait until association */
etimer_set(&eb_timer, CLOCK_SECOND / 10);
while(!tsch_is_associated) {
PROCESS_WAIT_UNTIL(etimer_expired(&eb_timer));
etimer_reset(&eb_timer);
}
/* Set an initial delay except for coordinator, which should send an EB asap */
if(!tsch_is_coordinator) {
etimer_set(&eb_timer, random_rand() % TSCH_EB_PERIOD);
PROCESS_WAIT_UNTIL(etimer_expired(&eb_timer));
}
while(1) {
unsigned long delay;
if(tsch_is_associated && tsch_current_eb_period > 0) {
/* Enqueue EB only if there isn't already one in queue */
if(tsch_queue_packet_count(&tsch_eb_address) == 0) {
int eb_len;
uint8_t hdr_len = 0;
uint8_t tsch_sync_ie_offset;
/* Prepare the EB packet and schedule it to be sent */
packetbuf_clear();
/* We don't use seqno 0 */
if(++tsch_packet_seqno == 0) {
tsch_packet_seqno++;
}
packetbuf_set_attr(PACKETBUF_ATTR_FRAME_TYPE, FRAME802154_BEACONFRAME);
packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, tsch_packet_seqno);
#if TSCH_SECURITY_ENABLED
if(tsch_is_pan_secured) {
/* Set security level, key id and index */
packetbuf_set_attr(PACKETBUF_ATTR_SECURITY_LEVEL, TSCH_SECURITY_KEY_SEC_LEVEL_EB);
packetbuf_set_attr(PACKETBUF_ATTR_KEY_ID_MODE, FRAME802154_1_BYTE_KEY_ID_MODE); /* Use 1-byte key index */
packetbuf_set_attr(PACKETBUF_ATTR_KEY_INDEX, TSCH_SECURITY_KEY_INDEX_EB);
}
#endif /* TSCH_SECURITY_ENABLED */
eb_len = tsch_packet_create_eb(packetbuf_dataptr(), PACKETBUF_SIZE,
tsch_packet_seqno, &hdr_len, &tsch_sync_ie_offset);
if(eb_len != 0) {
struct tsch_packet *p;
packetbuf_set_datalen(eb_len);
/* Enqueue EB packet */
if(!(p = tsch_queue_add_packet(&tsch_eb_address, NULL, NULL))) {
PRINTF("TSCH:! could not enqueue EB packet\n");
} else {
PRINTF("TSCH: enqueue EB packet %u %u\n", eb_len, hdr_len);
p->tsch_sync_ie_offset = tsch_sync_ie_offset;
p->header_len = hdr_len;
}
}
}
}
if(tsch_current_eb_period > 0) {
/* Next EB transmission with a random delay
* within [tsch_current_eb_period*0.75, tsch_current_eb_period[ */
delay = (tsch_current_eb_period - tsch_current_eb_period / 4)
+ random_rand() % (tsch_current_eb_period / 4);
} else {
delay = TSCH_EB_PERIOD;
}
etimer_set(&eb_timer, delay);
PROCESS_WAIT_UNTIL(etimer_expired(&eb_timer));
}
PROCESS_END();
}
