Is there a way to check presence of a MySensors network, and proceed without if not found ?

[Petjepet]

I think it is logical to have sensors try indefinitely since this is the concept of sensors in a network.
Otherwise you would not know (when not debugging) all is ok in your network.
A network sensor not being one in an usual way, just for convenience (like my BBQ-temp sensor), has to be defined otherwise.

[gohan]

If you configure the controller to send notifications when nodes don't report anything after 1 or 2 hours, you know that something is wrong without draining the battery in the process.