[riot-notifications] [RIOT-OS/RIOT] net/gcoap: support DTLS (#15549)

Martine Lenders notifications at github.com
Thu May 27 10:44:15 CEST 2021

> > ```
> > * Made one gcoap API change: Changed return type from `gcoap_req_send` from size_t to int, to allow negative return values. In this case, `gcoap_req_send` now returns `-ENOTCONN`, when the authentication process with the remote peer failed.
> > ```
> Why not `ssize_t` then?

And should this maybe moved to another PR, so the API change is more prominent?

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