pkg/wakaama: add Light Control object implementation

[leandrolanzieri]

Contribution description

This PR adds the implementation of the Light Control LwM2M object. The object takes care of the resources, the actual interaction to the light is done via a callback registered during instance creation. The wakaama example has been adapted to instantiate this object once ~if the LED0 is present~.

Testing procedure

• Check that the example works and the LED0 can be accessed.

Issues/PRs references

None

[fjmolinas]

@cgundogan @leandrolanzieri is this of interest for the next release?

[stale[bot]]

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[Teufelchen1]

Is there a way to have a unit or integration test for this?

[leandrolanzieri]

Is there a way to have a unit or integration test for this?

For this I think it would make sense to think about a generic LwM2M object tester application that can be extended as we add our object implementations. Probably out of the scope of this one.

I rebased and updated some things now:

• use ztimer_stopwatch to keep track of the on time
• allow server resetting on time
• the example always includes the light object
• a new command in the example cli to control the light object from the node's side
• updated documentation on the example

[Teufelchen1]

LGTM! There are some static test issues you might want to fix?

I tested it on native and it works fine!

[leandrolanzieri]

Squashed!

[riot-ci]

Murdock results

:heavy_check_mark: PASSED

ea2440f4ebb166ec069ed9816282c9bc533951e0 examples/lwm2m: add light control object

Success	Failures	Total	Runtime
10008	0	10009	06m:56s

Artifacts

[leandrolanzieri]

Thanks for the review!