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What is the best way to programmatically get notified of a arbitrary change in value of a given Pi tag?  Notifications?  Any other Way?

Question asked by chriswhsu on Oct 22, 2015
Latest reply on Oct 22, 2015 by chriswhsu

We are looking to call a REST API when a given tag's value meets some arbitrary condition.


What ways are there to do this?  We are currently querying the Pi database ever second or two, which adds latency and overhead.