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sys/net/nanocoap: Implement Observe (Server-Side) #21147

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sys/net/nanocoap: Implement Observe (Server-Side) #21147

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maribu
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@maribu maribu commented Jan 20, 2025

Contribution description

  • Clean up and extend the separate response feature of nanocoap
  • Add a bit of glue to use the separate response feature to implement observe

Testing procedure

Starting the Server

$ sudo ip tuntap add tap0 mode tap user $(whoami)
$ sudo ip link set tap0 up
$ make BOARD=native64 -C examples/nanocoap_server -j flash term

Running a Client

$ coap-client-notls -s 60 -m get 'coap://[fe80::9826:30ff:feb8:31f4%tap0]/time'
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Issues/PRs references

None

@maribu maribu added Type: new feature The issue requests / The PR implemements a new feature for RIOT CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR labels Jan 20, 2025
@github-actions github-actions bot added Area: network Area: Networking Area: CoAP Area: Constrained Application Protocol implementations Area: sys Area: System Area: examples Area: Example Applications labels Jan 20, 2025
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riot-ci commented Jan 21, 2025 •
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Murdock results

❌ FAILED

813077a fixup! sys/net/nanocoap: improve separate response handling

Success Failures Total Runtime
1724 0 9436 02m:14s

Artifacts

@maribu maribu force-pushed the sys/net/nanocoap/observe branch 2 times, most recently from f0a998f to 124752f Compare January 21, 2025 08:06
@maribu maribu marked this pull request as ready for review January 21, 2025 08:06
@maribu maribu force-pushed the sys/net/nanocoap/observe branch 2 times, most recently from a3e9b1c to c4de045 Compare January 21, 2025 08:41
@MrKevinWeiss MrKevinWeiss added the Process: blocked by feature freeze Integration Process: The impact of this PR is too high for merging it during soft feature freeze. label Jan 21, 2025
mguetschow
mguetschow reviewed Jan 21, 2025
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I just had a high-level look at it and have some nit's below. In general I don't feel confident enough in nanocoap_sock to tell whether this takes all nanocoap quirks into account, but the implementation looks good to me in general.

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examples/nanocoap_server/coap_handler.c Show resolved Hide resolved
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@MrKevinWeiss MrKevinWeiss removed the Process: blocked by feature freeze Integration Process: The impact of this PR is too high for merging it during soft feature freeze. label Jan 21, 2025
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Freeze is over so if anyone wants to pick this up...

maribu and others added 2 commits January 21, 2025 16:34
@maribu
sys/net/nanocoap: improve separate response handling
f8872c1 
This allows sending a separate response with CoAP Options and adds a
helper to detect duplicate requests, so that resource handlers can
repeat their empty ACK on duplicates.
@maribu @mguetschow
sys/net/nanocoap: implement observe
26f4f06 
This adds the new `nanocoap_server_observe` module that implements the
server side of the CoAP Observe option. It does require cooperation
from the resource handler to work, though.

Co-Authored-By: mguetschow <[email protected]>
@maribu maribu force-pushed the sys/net/nanocoap/observe branch from c4de045 to 26f4f06 Compare January 21, 2025 15:38
benpicco
benpicco reviewed Jan 22, 2025
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@maribu
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maribu commented Jan 22, 2025

Time for squash?

squash player dancing with racket in his hand

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@miri64 miri64 Awaiting requested review from miri64 miri64 is a code owner

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@chrysn chrysn Awaiting requested review from chrysn

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@maribu @riot-ci @MrKevinWeiss @miri64 @benpicco @mguetschow