https://www.kosemo.cz/files/614_63040124_servisni-navod-2107_cz.pdf
https://www.kosemo.cz/files/05647118_bfu_obsluha_cz.pdf
ovladani buderus bfu
https://the78mole.de/reverse-engineering-the-buderus-km217/
https://www.tindie.com/products/the78mole/buderus-km271-wifi-replacement/
https://the78mole.de/projects/km271-wifi-howto/