[riot-notifications] [RIOT-OS/RIOT] pkg/tinydtls: handling of close_notify (#16422)

János Brodbeck notifications at github.com
Tue Jul 6 18:08:02 CEST 2021

Yes, 4.2.8 is a crucial problem part here. With this workaround, we can run into the problem that we force close a session and cannot re-establish the session with the same peer until the other side timeouts/resets the session on their side. I mentioned this problem in comment https://github.com/RIOT-OS/RIOT/pull/16422#issuecomment-855876182. To be honest, I consider 4.2.8 as a MUST and not a SHOULD for a DTLS stack, especially when used on constrained devices.

But this is and was a problem even without this workaround, since we do not get informed by the API right now if the closing was successful (= ACK from the remote part). In the case closing was unsuccessful, it could make tinyDTLS unusable in the long run without noticing by the application.

This workaround should never stay forever, it's only supposed to be a temporary solution for clients, so they don't become unusable over time if the close_notify is not ACK-ed.

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