[riot-notifications] [RIOT-OS/RIOT] pkg/tinydtls: add DTLS sock API implementation (#11943)

Aiman Ismail notifications at github.com
Mon Sep 30 16:36:33 CEST 2019

> I think there's a bug in the dtls-echo example. The server does not returns a hanshake failure when no matching cipher found.

This still need to be confirmed in the dtls-echo example, but not related to this PR.

> That said, with that commit applied I found a new problem. Test procedure:
>     1. Start with client ECC server PSK
>     2. Try sending to server. This will fail because no matching cipher found. Server then sends handshake failure alert to client
>     3. Reflash client, this time using PSK and try sending to server. This will also fail. The client will timeout. Server gave warning:
> ```
> WARN The message sequence number is too small, expected 1, got: 0
> ```

This is the issue I found in this PR after fixing the kernel panic issue (581b10a) you mentioned before.

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