PI Web API Channels allow to get continuous updates for any stream or streamset (by providing its WebId). Is there any way to have a streamset object that retrieves data for multiple elements?
From StreamSet spec:
In my case I want to retrieve attribute values that share common ancestor element (but it is not the parent). I know that it would be possible to make such query with Batch controller and I need similar result using Channels. In other words I don't want to open a WebSocket connection for every element in the AF but create one connection for all of the elements.