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Improve NTP synchronization by rejecting synchronization if the standard deviation of the time offset or round-trip delay is larger than 1 second. This ensures the time cannot go off even in cases where the network connectivity is really bad

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Signed-off-by: DL6ER <dl6er@dl6er.de>
This commit is contained in:
DL6ER
2024-06-07 18:50:14 +02:00
parent 93f751f90a
commit 671771ceb0
1 changed files with 9 additions and 0 deletions
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src/ntp/client.c
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@@ -418,6 +418,15 @@ bool ntp_client(const char *server, const bool settime, const bool print)
log_info("Average time offset: (%e +/- %e s)", theta_avg, theta_stdev);
log_info("Average round-trip delay: (%e +/- %e s)", delta_avg, delta_stdev);
// Reject synchronization if the standard deviation of the time offset
// or round-trip delay is larger than 1 second
if(theta_stdev > 1.0 || delta_stdev > 1.0)
{
log_warn("Standard deviation of time offset is too large, rejecting synchronization");
free(ntp);
return false;
}
// Compute trimmed mean (average excluding outliers)
double theta_trim = 0.0, delta_trim = 0.0;
unsigned int trim = 0;