@Heizelmann My answer also presumed using sleep() in the main loop, but to combine it with a seperate ISR. This concept seems to work, at least this was my conclusion when reading the mentioned PulseCounter-sketch, that can be configured as sleeping or non-sleeping node. But I may be wrong, all my nodes are on power supplies until now...

@division can you please describe which concrete RF24 Library you took , which version of MySensors library you use, and how you integrate the RF24 library into MySensors?

the Node To Node must be seen as a Gateway to node :) the controller is not mandatory. so we rethink the topology. Gateway (node0) <---> Node1 <---> Node2 <---> 3.. 4... The Gateway in 2022/2023 must be used, how to do!!?!! ...... a Node Useful :) (yes an old message, but to refresh the ideas ) happy holidays to you all

Sorry, my fault. The receiveTime function is called. The problem was that I had an error in the Serial.println() statement so it doesn't appear in the log.

@mfalkvidd Thanks for the link to this thread. I didn't found this before. It is exactly my problem, so we can close this thread and continue discussing in thisone. @tekka Thank you for this outlook. For me this feature is essential and I am wondering if it is not implemented from the beginning. So I hope that it will be published soon. Anyway I like MySensors and the great developer community. Many thanks to all.