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

János Brodbeck notifications at github.com
Fri May 28 13:13:08 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?

True, I change it to ssize_t, that makes sense to keep, because positive values still returns sent bytes.

Regarding moving to a separate PR: I can do that. Gives possibly also again more attention that this PR is (IMHO) in advanced state.

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