I am quite happy about this solution 
Could you help me with one more thing:
I only would like the Adeunis Decoder to process the Raw Payload:
I dont know how to extract the single fields of the msg.payload recieved from the TTN Input.
Probably i have to use a function to convert the 11 Bytes Buffer to a string, that then is the input for the function ?
Any help also tutorials or documentation will be great.
Thank you a lot!