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The data from the REST API should give you a smaller resolution since you should get "fresh" data every time you call it.
However if you want to catch peaks and the like, you will essentially need a different feature where the device would store the max, min and average values over a period of time. As far as I can see currently the 3em is sending the data at an interval and it sends whatever the current data is at that time...
Please correct me if the value is actually build as an average over the 5 minutes...