Thank you both for your quick replies.
I looked at the Robin2 tutorial and tried the code for the one-way transmission and the two-way transmission. In both cases my message was not sent.
I also tried to separate the antennas further. Was a little over a meter.
Do you have any more ideas what I can do?
Here is the package I bought.
Is this maybe because I do not reset correctly? How do I do reset correctly?
Thanks 