[riot-notifications] [RIOT-OS/RIOT] tinydtls: add `sock_async` support for `sock_dtls` (#12907)

Martine Lenders notifications at github.com
Thu May 7 16:28:42 CEST 2020

> Yes, I agree. The blocking behavior can still be done even with `sock_async`. So that means `sock_dtls_send` will need to refer somewhere to decide to block or not. We could add a parameter `nonblock` to the function or set non-blocking per sock in `sock_dtls_create`.

How about keeping it symmetric to `recv` and making it a `timeout` where `0` is non-blocking and `SOCK_NO_TIMEOUT` is blocking? Something similar would then be needed for `sock_dtls_create_session()` as well (I was wondering why it isn't already anyway)

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