How to get data only updated data of webids using batch process
I assume you are asking to receive Attribute updates through PI Web API. There exist 2 different options.
The first one is the Channels controller which is using WSS protocol instead of HTTPS.
The second option is based on HTTPS and means registering for updates. This option is available through the Stream controller (single data item) and StreamSet controller (multiple data items). Because I understand you are interested in registering for multiple data items, please refer to RegisterStreamSetUpdates and RetrieveStreamSetUpdates.
Retrieving data ...