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- The responsibility for handling matching CoAP No-Response Options
has been split:
- `coap_build_reply()` only needs to report this and return
`-ECANCLED`
- `coap_handle_req()` does generate the empty ACK is needed.
==> As a result, writing CoAP request handlers correctly becomes a
lost easier. Correct error handling to be present is now
sufficient for correct handling of No-Response options.
==> This change is backward compatible with existing code.
- The API doc has been cleaned up and straightened
Co-authored-by: mguetschow <mikolai.guetschow@tu-dresden.de>