void
uip_ds6_send_rs(uip_ds6_defrt_t *defrt)
{
u8_t unicast_rs = 0;
if (!timer_expired(&uip_ds6_timer_rs)) {
return;
}
locdefrt = NULL;
/* First check whether we can unicast the RS to a specific router rather than
* multicasting it. */
if ((defrt != NULL) && (defrt->isused)){
/* Mark this router as "sending_rs" in case it wasn't marked already */
defrt->sending_rs = 1;
locdefrt = defrt;
unicast_rs = 1;
} else {
for(locdefrt = uip_ds6_defrt_list;
locdefrt < uip_ds6_defrt_list + UIP_DS6_DEFRT_NB; locdefrt++) {
if((locdefrt->isused) && (locdefrt->sending_rs)) {
unicast_rs = 1;
break;
}
}
}
if (unicast_rs) {
if (locdefrt->rscount < UIP_ND6_MAX_RTR_SOLICITATIONS) {
/* Unicast RS and update count and timer */
uip_nd6_rs_output(&locdefrt->ipaddr);
locdefrt->rscount = locdefrt->rscount > 10 ? locdefrt->rscount : locdefrt->rscount + 1;
timer_set(&uip_ds6_timer_rs, rs_rtx_time(locdefrt->rscount) * CLOCK_SECOND);
return;
} else {
/* Switch to multicast */
locdefrt->sending_rs = 0;
rscount = locdefrt->rscount;
locdefrt->rscount = 0;
}
}
/* Multicast RS and update RS count and timer */
uip_nd6_rs_output(NULL);
if(uip_ds6_defrt_choose() == NULL) {
rscount = rscount > 10 ? rscount : rscount + 1;
} else {
rscount = 0;
}
/* Make sure we do not send rs more frequently than UIP_ND6_RTR_SOLICITATION_INTERVAL */
timer_set(&uip_ds6_timer_rs, rs_rtx_time(rscount) * CLOCK_SECOND);
}
/*---------------------------------------------------------------------------*/
static void
handle_periodic_timer(void *ptr)
{
rpl_purge_routes();
rpl_recalculate_ranks();
/* handle DIS */
#if UIP_ND6_ENGINE != UIP_ND6_ENGINE_RPL
#if RPL_DIS_SEND
next_dis++;
if(rpl_get_any_dag() == NULL && next_dis >= RPL_DIS_INTERVAL) {
next_dis = 0;
dis_output(NULL);
}
#endif
#else
if(rpl_get_any_dag() == NULL && stimer_expired(&uip_ds6_timer_dis)) {
discount++;
dis_output(NULL);
stimer_set(&uip_ds6_timer_dis, rs_rtx_time(discount));
}
#endif
ctimer_reset(&periodic_timer);
}
