tree 8d19b48ac84a9052e3777915b3cdcb398dfdf4a0
parent 9b0d3db228037402e4b632b7239b295c4a399c74
author Abtin Keshavarzian <abtink@google.com> 1690411840 -0700
committer GitHub <noreply@github.com> 1690411840 -0700
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[mle] update Avd trickle timer interval based on router neighbor count (#9307)

This commit updates the `TrickleTimer` to allow `IntervalMax` and
`IntervalMin` to be changed while the timer is running. In particular,
when `IntervalMax` is changed to a value that is shorter than the
current interval being used by the timer, the timer will adapt the
new shorter interval and may fire immediately.

A unit test `test_trickle_timer` has been added to validate the
behavior of `TrickleTimer` in detail. All different scenarios where
`IntervalMax` or `IntervalMin` are changed are covered by the
unit test.

The new mechanism to change the trickle timer `IntervalMax` is
used to update the MLE Advertisement trickle timer. The `IntervalMax`
is determined based on the number of router neighbors of the device
with link quality 2 or better. If the device has fewer router neighbors,
it will use a shorter `IntervalMax`. As new links are established
with routers, the `IntervalMax` is recalculated and updated on the
Advertisement trickle timer.

This commit also adds a new test `test-024-mle-adv-imax-change.py` to
validate updates to the `IntervalMax` value based on the number of
router neighbors.

Co-authored-by: David Smith <david.smith@mmbnetworks.com>