@user2684 Thanks for the advice. Now I got it running.:yum::pray:

@zboblamont My question is related to:
https://github.com/mysensors/NodeManager
This should be an easy way to get sensors running. It should be nice, if You have a battery- powered node as well.
But for me it is not clear what to to, if You want some extra information to be transmitted.
So I thought, that would be as easy as setting up a node.

Only playing a little with:
"NODEMANAGER_HOOKING OFF allow custom code to be hooked in the out of the box sensors"

As far as I understand, Your way is the conventional approach.
That will work for sure, but than power saving is an issue.
I want that stuff be powered by solar or battery. So it should be very power efficient. That is the reason to try the NodeManager.