(SOLVED) Sensebender Gateway and HomeAssistant: where does the battery level come from?

[pikim]

Hello,

currently I'm working on a custom Sensebender Gateway. I adapted the variant files to my hardware and it works so far. It's an Ethernet Gateway and the integration into HomeAssistant also worked well. But in HA it always shows 0% battery level (regardless of the level at the pin) and I didn't find the source location where that comes from. Can anyone tell me where to find it?

I would like to measure the supply and/or battery voltage and calculate some realistic battery level.

EDIT:
Something like

sendBatteryLevel(91);

solves the issue.