TFA 30.3233.01 rain sensor

Hi,
Is anyone here using the TFA 30.3233.01 rain sensor?
I am using this with the RFXcomm integration. Total rail seems to work - however this is a cumulative total over time.

Rain rate is always shown as “unknown” - even when there has been rain. I would expect this to be 0mm/h if no rain, or some positive number if there had been rain

Does anyone else have this working?

For anyone findig this with google. This device provides a cumulative value that is similar to utility meters. With the HA native Utility Meter integration you can set up a sensor to track daily, monthly or yearly cumulative values that reset at the end of the respective period.