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[mle] send unicast Link Request to 1.2 parent on router role promo (#9154)

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This commit adds a new mechanism to send a unicast MLE Link Request to
the device's former parent if its version is earlier than 1.3.0, when
the device is promoted from a child to a router role. This is to
address a potential compatibility issue with some non-OpenThread
stacks which may ignore MLE Advertisements from a previous/existing
child.
This commit is contained in:
Abtin Keshavarzian
2023-06-12 11:29:06 -07:00
committed by GitHub
parent 9b99fbfd09
commit 90c090f1ef
1 changed files with 10 additions and 0 deletions
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src/core/thread/mle_router.cpp
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@@ -3542,6 +3542,16 @@ void MleRouter::HandleAddressSolicitResponse(Coap::Message *aMessage,
leader->SetNextHopAndCost(RouterIdFromRloc16(mParent.GetRloc16()), mParent.GetLeaderCost());
}
// We send a unicast Link Request to our former parent if its
// version is earlier than 1.3. This is to address a potential
// compatibility issue with some non-OpenThread stacks which may
// ignore MLE Advertisements from a former/existing child.
if (mParent.GetVersion() < kThreadVersion1p3)
{
IgnoreError(SendLinkRequest(&mParent));
}
// We send an Advertisement to inform our former parent of our
// newly allocated Router ID. This will cause the parent to
// reset its advertisement trickle timer which can help speed