I have had trouble getting the MAP transformation service working. Tried through the PaperUI and then setup the addons.cfg file with the right bindings, and transformation service, but still see the following errors:
[rest.core.item.EnrichedItemDTOMapper] - Failed transforming the state ‘NULL’ on item ‘FF_LaundryRoom_Door’ with pattern ‘[MAP(door.map):%s’: Couldn’t transform value because transformation service of type ‘[MAP’ is not available.
# A comma-separated list of transformation services to install (e.g. “transformation = map,jsonpath”)
transformation = map
Just ran openhabian-config and updated to the latest release.