ah you are right. My mistake. When I use:
sudo python /home/pi/domoticz/scripts/pyKamstrup_single.py /dev/ttyUSB1 60 21

I get:
Traceback (most recent call last):
File "/home/pi/domoticz/scripts/pyKamstrup_single.py", line 243, in <module>
value = int(value * 1000)
TypeError: unsupported ...

This is really an annoying add-on, as my firefox is automatically is set to clean all cookies in the end of the tab session and of course this board is the _only one_ I've personally seen using this add-on. I'm quite sure that GDPR does not require any board maintainers to require clicking these ...