Ne ne... Das habe ich schon übersetzen können. Aber ich verstehe das Problem nicht und dachte das du es ggf. verstanden hast
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Hmmm.. The first Part of your answer are very interesting for me. (Sorry for my english)..
Its the jason string the Problem...hmmm ... Iam not a professional programer. But you can try to contact shelly support on shelly.cloud. you can easily do that via Chat on thier www side.
The support is great and not like T-Mobile .
Other way... Look into the fhem mqtt2server Modul. If the syntax is no problem for you, you can transfer it. Fhem SVN in Google...its Open Source.
i dont unterstand the Problem. Can you give us more Information pls?
Why your server send false headers? Why you use this way, if you can use ready Systems (iObroker, fhem,.....).
This is http get and not mqtt but i think that can be a way. Wich System you use?
The correct Header is shown in the Doku. Are you programer or beginner? I quest, because in normal, a programer can read and use the Doku. Iam not a programer but with more Input, i think we can help