THAT moment when you realize that the webinterface of the access point in a Devolo dLAN® 1200+ Powerline gets updated via jQuery from a json file!
curl 'http://10.xxx.yyy.zzz/cgi-bin/htmlmgr?_file=getjson&service=hpdevices'
[{"loc":"local","type":"hp200","name":"dLAN 1200+ WiFi ac","mac":"F4:06:ab:ab:ab:ab","tx":"","rx":"","ustr":"teh remote"},{"loc":"remote","type":"hp200","name":"dLAN 1200+","mac":"F4:06:aa:bb:cc:dd","tx":"85.3125","rx":"254.625","ustr":"teh master"},{}]