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[csl] adjust polling closer to the CSL Timeout end (#7463)

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Thread Certification Harness makes use of CSL Timeout configurations
as low as 10 seconds, with the expectation that the SSED will try to
autosync very near to the end of the CSL Timeout.

However, the default configuration is to send a Data Request 4 secs
before, which makes several certification tests to fail due to
unexpected polling.

This commit sets the default `pollAhead` to 1 second, aligning better
with the certification testing expectations.

For the on field deployments it shouldn't be an issue that the Data
Request does not reach the parent exactly before the CSL Timeout
expiration since it will resynchronize anyway once one of the
retransmissions reaches the parent.
This commit is contained in:
Eduardo Montoya
2022-03-10 14:00:33 -08:00
committed by GitHub
parent b34f2a3fd3
commit c16abe00e6
1 changed files with 2 additions and 1 deletions
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src/core/mac/data_poll_sender.cpp
+2 -1
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@@ -550,7 +550,8 @@ uint32_t DataPollSender::GetDefaultPollPeriod(void) const
#if OPENTHREAD_CONFIG_MAC_CSL_RECEIVER_ENABLE && OPENTHREAD_CONFIG_MAC_CSL_AUTO_SYNC_ENABLE
if (Get<Mac::Mac>().IsCslEnabled())
{
period = OT_MIN(period, Time::SecToMsec(Get<Mle::MleRouter>().GetCslTimeout()));
period = OT_MIN(period, Time::SecToMsec(Get<Mle::MleRouter>().GetCslTimeout()));
pollAhead = static_cast<uint32_t>(kRetxPollPeriod);
}
#endif