I struggle for a while in the case of monitoring data from smartmeter (S0-Impulse). I count the S0-pulses with a Raspi 1wire-USB-Master in my current distribution board. The Data from the electric meter and the gas meter are stored as numerical values in a rrd-Database (not rrd4j) on the Raspi. My Openhab 2.1 is running on a VM in the same Network and has access to the database over a samba-share. At this point I have no idea how to read the data from the rrd-file to build any Graphs. I have no programming skills and need examples to build it for my own needs. I would be glad if someone has a hint for me.