Hello Philipp!
Thank you very much, i will try.
What I do not understand, how do I get the event-id, with mqtt?
As I know now, after short reading, I have to send the file to the event binaries, like:
POST /event/events/{id}/binaries, but how do i get this id, when i get the command via mqtt ?
Sorry for asking so much questions, but I am a little bit lost 
Regards, manfred