Just to promote my idea a little more.
Find attached 2 screenshots of the data I retieve from RRD using rrd graph tool. It shows rain in %, luminace (day/night)% and cloud coverage % over two days. As you can see my rain sensor is not working propperly I need to add a heater to prevent showing e.g. 50% when it is just foggy outside but no rain. The second graph shows Tsky and Tamb.
I think it would be a nice feature for the INDI weatherstation as well to use RRD. Of course you can retrieve the most current sensor data as well just as plain values instead of a graph to feed it into Ekos.
If anybody is interested to build a prototype that provides an integration into INDI / Ekos I can provide a ready to use database with real data stored and a description of the layout (kind of data in what order). Attached you find a script listing for the creation of my rrd database. The sensor data are accessed by name e.g. "Tsky" (range -20 to 80), "clouds" (range 0 to 100) etc. .
RRD is GPL you find it here: oss.oetiker.ch/rrdtool/index.en.html

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