Basically I would like to push data from the PI Server on PI Points updating instead of time-interval based requests
This is possible through the use of Data Pipes within the AF SDK. We have a learning video on how to use these in code that you can find here which is part of our larger course on how to get started with the AF SDK.
Have you looked at Data Pipes? This signs up to a PI tag for updates, but you need to routinely check the pipe for new events. Theres a good video that shows you about it here.
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And some code examples
Retrieving data ...