Another question. I have set up a flow to store separate tags into umh core (uns). Now I have to implement the following logic: when the tag in uns changes -- post a message to mqtt. But the message should be an aggregation of values from multiple uns tags. I thought that Stream Processor will help and created a processor flow with a dedicated data type and contract. Now I see data contract in Tag Browser. I tried using data model topic as input.But it does not return all the contained values -- only one underlying tag that changed. Please give some tips how to create a message containing values of multiple tags