[riot-notifications] [RIOT-OS/RIOT] sock/dtls: add function to retrieve epoch of session (#15881)

chrysn notifications at github.com
Fri Jan 29 16:06:37 CET 2021

>From a first look, I'd need a better understanding of what "current" means w/rt received and sent messages. For example, if I receive a message and then call `sock_dtls_session_get_epoch`, can I be sure that the message I "just" received was from that epoch, or did maybe the epoch just change after that?

Sockets now have an auxiliary data API (since #14703: sock_udp_recv_aux & co). Would using those solve the abovementioned issue? There could be a field for epoch in the sock_dtls_aux_rx_t. Possibly also in sock_dtls_aux_tx_t, either to be populated by the library and read after sending, or to be set / forcing the library to send it in that epoch or not at all.

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