[riot-notifications] [RIOT-OS/RIOT] gcoap: multi-transport support for clients (#16688)

Martine Lenders notifications at github.com
Tue Jul 27 23:43:57 CEST 2021


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### Contribution description
https://github.com/RIOT-OS/RIOT/pull/15549 introduced DTLS support for CoAP, but did not make it possible to select the transport on request. Since switching between CoAP and CoAPS (CoAP-over-DTLS) as client is a valid use case (one might want to e.g. talk to one server over CoAP and to another over CoAPS), this change makes that possible.

This is only a draft for now.

TODOs:

- [ ] Testing.
- [ ] Also make listeners configurable at run-time.

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### Testing procedure
Untested for now.
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### Issues/PRs references
Follow-up on https://github.com/RIOT-OS/RIOT/pull/15549
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/16688

-- Commit Summary --

  * gcoap: multi-transport support for clients

-- File Changes --

    M sys/include/net/gcoap.h (95)
    M sys/net/application_layer/gcoap/gcoap.c (121)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/16688.patch
https://github.com/RIOT-OS/RIOT/pull/16688.diff

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