I am using a chart for showing my iPhone presence. The underlying script returns either 0 or 1 and so should the graph display either 0 or 1.
But oddly enough sometimes the graph shows values in-between:
I have never noticed this behavior in OH1.
Is this a problem of the chart? Or the persistence (I am using rrd4j for the charts)? Or is there anything I can do against? Maybe I have to synchronize the refresh rate and the script execution (every minute)?
Any ideas are welcome…