parameters for missing 'hvac_mode' in bsblan.py

[fuimsr]

@fuimsr If you can provide the parameters number with the functions behind it needed for climate platform. I have already multiple heating circuits support so maybe this is also ok to implement now.

Originally posted by @liudger in #1271

I can not reply on the original issue anymore as it is limited to collaborators, but I would like to help in any way. How can I download this, or is there a standardized format for writing them down?

[liudger]

I'll give you a list with parameters from the regular parameters for climate. You can find the parameters in your system and add them to the list