I did, but after a simulated "power outage" item.state would simply return 0, so my sensor would reset and start accumulating KWH from 0 again. I updated use rrd4j rather than my.openhab and used pulseCountItem.previousState(false, "rrd4j").state // get the most recent update, even if it is the same as the current state It's now working :-)

I found late last night that the issue was the line var String msg = message.get(5) so by looking at your code I'm pretty confident that it will work. I haven't digged into the details, but it seems like the Pulse Meter request for last pulse count // Fetch last known pulse count value from gw gw.request(CHILD_ID, V_VAR1); doesn't carry any payload, so String[] message has a length of 5 rather than 6. So the error message "5" is some weird presentation of an IndexOutOfBoundsException

@Daniel-Lindberg go wire wrap! Its the future! :smile: