[riot-notifications] [RIOT-OS/RIOT] sys/net/gcoap: allow seperate response (#16578)

Jana Eisoldt notifications at github.com
Tue Jun 22 17:10:33 CEST 2021


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### Contribution description

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Gcoap doesn't allow sending separate responses on CON messages (see #14393). This can be useful if it is known ahead that computations on the server will take longer. Otherwise the client will retransmit the request and a timeout will occur.
This PR allows to choose separate responses instead of piggybacked responses for a resource. It does not allow to send separate responses per request by the handler itself (as suggested in #14395), but is done by gcoap in case this was selected for a resource.

### Testing procedure

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Start a gcoap server and GET from a client `/riot/board` (as CON message). Observing it with Wireshark shows that an Empty response message is sent before the actual response is sent.

### Issues/PRs references
See also #14395, #14393
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/16578

-- Commit Summary --

  * seperate response in gcoap

-- File Changes --

    M examples/gcoap/gcoap_cli.c (4)
    M sys/include/net/gcoap.h (5)
    M sys/include/net/nanocoap.h (3)
    M sys/net/application_layer/gcoap/gcoap.c (23)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/16578.patch
https://github.com/RIOT-OS/RIOT/pull/16578.diff

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