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TSCH: reduce keep-alive traffic as we get more accurate drift estimates

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Simon Duquennoy 2016-06-23 18:43:12 +02:00 • committed by Simon Duquennoy
parent ab706a6f33
commit 15dc86aeb1
3 changed files with 31 additions and 7 deletions
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16
core/net/mac/tsch/tsch.c
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@ -151,6 +151,8 @@ uint8_t tsch_join_priority;
static uint8_t tsch_packet_seqno = 0;
/* Current period for EB output */
static clock_time_t tsch_current_eb_period;
/* Current period for keepalive output */
static clock_time_t tsch_current_ka_timeout;
/* timer for sending keepalive messages */
static struct ctimer keepalive_timer;
@ -187,6 +189,12 @@ tsch_set_join_priority(uint8_t jp)
}
/*---------------------------------------------------------------------------*/
void
tsch_set_ka_timeout(uint32_t timeout)
{
tsch_current_ka_timeout = timeout;
}
/*---------------------------------------------------------------------------*/
void
tsch_set_eb_period(uint32_t period)
{
tsch_current_eb_period = MIN(period, TSCH_MAX_EB_PERIOD);
@ -256,10 +264,10 @@ keepalive_send()
void
tsch_schedule_keepalive()
{
/* Pick a delay in the range [TSCH_KEEPALIVE_TIMEOUT*0.9, TSCH_KEEPALIVE_TIMEOUT[ */
if(!tsch_is_coordinator && tsch_is_associated) {
unsigned long delay = (TSCH_KEEPALIVE_TIMEOUT - TSCH_KEEPALIVE_TIMEOUT / 10)
+ random_rand() % (TSCH_KEEPALIVE_TIMEOUT / 10);
/* Pick a delay in the range [tsch_current_ka_timeout*0.9, tsch_current_ka_timeout[ */
if(!tsch_is_coordinator && tsch_is_associated && tsch_current_ka_timeout > 0) {
unsigned long delay = (tsch_current_ka_timeout - tsch_current_ka_timeout / 10)
+ random_rand() % (tsch_current_ka_timeout / 10);
ctimer_set(&keepalive_timer, delay, keepalive_send, NULL);
}
}