Sorry I have to ask again (I would be equally happy for a link with a similar discussion, I did not found one). Maybe some sees my mistake, because I do not get the correct data:
I forward the data that I receive correctly in TTN to another device.
Her I decrypt the data. I use AES128 in EBC-Mode with the AppSKey which should give the same data I receive in TTN.
(Conferring to this page https://www.thethingsnetwork.org/docs/lorawan/security I use the right and only needed key.)
Am I mistaken somewhere? If not I will challenge the implementation of my decryption-code.
Many thanks in advance!