Correct ufsi timing calculation #14748
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When calculating ufsi, the function was relying on the slot processed by the unicast fhss timer callback, which can be delayed. When it happens the slot value is wrong, and the ufsi is incorrect. The ufsi is then used by the peer to determined the reply channel, so the devices are thus unsynchronized until the next uplink packet.
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@AlbanJeantheau-silabs, thank you for your changes. |
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@artokin Please review |
JarkkoPaso
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Jun 9, 2021
connectivity/nanostack/sal-stack-nanostack/source/Service_Libs/fhss/fhss_ws.c
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JarkkoPaso
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Co-authored-by: Jarkko Paso <jarkko.paso@arm.com>
JarkkoPaso
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Jun 11, 2021
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Summary of changes
This change fixes UFSI calculation. We have noticed in some circumstances the fhss timer callback can be delayed, wisun devices can lost frequency hopping synchronization.
When calculating ufsi, the function was relying on the slot processed by the unicast fhss timer callback, which can be delayed. When it happens the slot value is wrong, and the ufsi is incorrect.
The ufsi is then used by the peer to determined the reply channel, so the devices are thus unsynchronized until the next uplink packet.
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Migration actions required
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