FYI the meter is transmitting every 15 minutes
Here is wmbus log. Its seeing the 8971 on USB0
But unhappy with the connection
Warning! Desired link modes none cannot be set for device /dev/ttyUSB0:im871a[78563412]
s6-rc: info: service legacy-services: stopping
I did not install any drivers manually. I am afraid I cannot really help, because I am not familiar with your setup (I am running HA OS).