We have a problem showing the realtime data on our local emoncms. The data in the graph is not showing for the power feed and when looking into the source code, we find NULL values for the data points. Is there something we are looking over ?
This is happening with the feed we crated from a multiplication of two inputs, namely the power_online_W feed.
We are working on the emonpi.local platform with local AP, without internet connection. Raspberry Pi Model B+, emonSD-30Oct18. We are installing a DC monitoring system with inputs from Arduino via serial connection. This is not our first setup, with the Raspberry Pi 2 Model B and emonSD-07Nov16 we had it working last year.
What log can I post for more clarity of the issue ?