[riot-notifications] [RIOT-OS/RIOT] gcoap: improve block-wise transfer API. (#16715)

Martine Lenders notifications at github.com
Thu Aug 5 16:05:14 CEST 2021

#### Description
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After working a bit with block-wise transfer in both `gcoap` and `libcoap`, I kind of hate how block-wise transfer is handled in `gcoap`. A lot of work is already taken of once shoulder by using the slicer (which is also non-obvious, because there are no examples for that in the repo), but still there is a lot of in-depth knowledge about RFC 7959 required to enable you to exchange large data. `libcoap` solves quiet nicely (but still far from perfect), by having `_large_` versions of functions that could require block-wise transfer that hide most of the mechanics of block-wise transfer from the user. A similar user-friendly approach would be desirable. 

### Useful links
- https://libcoap.net/doc/reference/develop/man_coap_block.html

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