Thing actions: Support @ActionOutput
for single return values
#4430
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See discussion in openhab/openhab-addons#17504 (comment).
This adds processing of the ActionOutput annotation for Thing actions with a single return value, which allows providing a label for use in the UI. The output name for those actions is "result", which is now the default value in the @ActionOutput annotation. If a binding overrides the default name, a warning is logged.
If a Thing action returns a Map<String, Object> but does not provide the @ActionOutputs annotation, a warning is logged.