Km200 still working for me, with the exception of gas consumption
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.
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For those of you who are frustrated with the KM200 integration in Home Assistant, I recommend taking a look at the gateway from BBQKees. I switched to it and sold my KM200. You can also use it to calculate the heating consumption as input for the energy dashboard. 
More information can you find on my website (german) or here: Configuration for Home Assistant (MQTT Discovery) — EMS Gateway documentation (bbqkees-electronics.nl)
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Hi
This looks promising, I constantly get issues with my KM200 disconecting from my Unifi network. It was ok before but since it is on a Unifi switch it very unstable.
I would buy the BBQkees but I want to be sure I can calculate the consumtion. Can you tell me how it’s doing it?
Thanks!
That was the right hint, it is now running.
RC310 V2 + KM200
Thank you very much!
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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.