For information, I successfully setup a KM200 v2 & it recognise my rc310.
Make sure you have a DHCP that always give the same address to your KM200.
1st parameter is the IP address of the KM200
For the 2 nd parameter, use the « password » which is printed on the KM200 but remove the - ex : abcd-abcd-abcd-abcd → abcdabcdabcdabcd
3rd parameter is the password you have setup on the mobile app MyDevice from Buderus.
I hope it helps.