[SOLVED] SYSTEMINFO binding: device index for network?


I have openhab2 (2.2.0) running on my RPI3 with the systeminfo binding working (incl temperature!)
Now I want to monitor the network bytes sent and received using this binding.
However it needs a deviceIndex (https://parg.co/UMo) but I do not understand how (and where) to add this.
Without it the variable returns 0, perhaps because it is looking at the WIFI interface instead of the ethernet.

Is there anyone who got this working ?



Tnx !