Hello dognose,
Thanks for your reply.
I get around the problem as follows (since many command line commands often get lost after the next fw update).
I simply connected a second Canbus interface for the VM-3P75CT grid meter.
Can0 VM-3P75CT
Can1, BMS
WLAN Internet/VRM.
This is not the desired solution, but it works without having to invest any more time.