The binding doesn’t seem to retrieve data by the meter (e.g meter_watts). Interesetingly the null value is populated at first (null value being set), but then no more reports are retrieved.
Confirmed with “Z Wave PC Controller” that meter data is sent, accordingly to the configuration params.
Any advices on how to debug this further down? (DISCLAIMER: total beginner)
Please provide a DEBUG log.
When the binding starts, it will poll the meter and sets the value.
The device is probably not polled after startup and you should rely on the meter to send the data unsolicited. This my require configuration of the device to tell it to end data at the rate you want.
That link helped me a lot, because I was not aware you could have debug log on only a specific binding - thanks! As it seems, data is tranferred as configured and also seen by openhab - its just always the same. 
I’ll skip posting the log, as I don’t see the point anymore.
I opened a ticket with aeotec and will see what comes out of that.
What is your setting for parameter 80 Group 1 notifications ?
The default setting (3) is to send Hail CC only for manual switch.
I’ve the default there currently. Configured watts and energy in 101 and 102 with both 30sek report time. As written before the values are reported, but are always the same. It must have worked at one point, otherwise I wouldn’t have a value of 3.29 at kWh (see log)
2019-12-11 00:35:24.053 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Command received zwave:device:70cce884:node14:switch_binary --> ON [OnOffType]
2019-12-11 00:35:35.362 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_watts to 0 [DecimalType]
2019-12-11 00:35:37.693 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:switch_binary to ON [OnOffType]
2019-12-11 00:35:37.721 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_kwh to 3.298 [DecimalType]
2019-12-11 00:35:55.117 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_watts to 0 [DecimalType]
2019-12-11 00:35:56.551 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_watts to 0 [DecimalType]
2019-12-11 00:36:09.179 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_kwh to 3.298 [DecimalType]
2019-12-11 00:36:09.314 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_kwh to 3.298 [DecimalType]
2019-12-11 00:36:28.949 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_watts to 0 [DecimalType]
2019-12-11 00:36:43.861 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_kwh to 3.298 [DecimalType]
2019-12-11 00:36:59.549 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_watts to 0 [DecimalType]
2019-12-11 00:37:14.365 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_kwh to 3.298 [DecimalType]
2019-12-11 00:37:29.303 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_watts to 0 [DecimalType]
2019-12-11 00:37:44.702 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Updating channel state zwave:device:70cce884:node14:meter_kwh to 3.298 [DecimalType]
2019-12-11 00:37:59.850 [DEBUG] [ding.zwave.handler.ZWaveThingHandler] - NODE 14: Command received zwave:device:70cce884:node14:switch_binary --> OFF [OnOffType]
I’d put solved tag, to not attract more help of you guys, as this seems to be a hardware issue. Will keep you updated either way