Relax frame counter

When activating a node via OTAA is possible to relax the frame counter?

When i perform the node activation, it doesn’t restart the frame-counter somehow

No, relax-frame counter mode is ABP only. When the frame-counters don’t reset, it means that the OTAA activation hasn’t been processed.

Thanks, this could be an issue with the node itself

The OTAA is triggered by the node right?
If i have an arbitrary node sending frames once a day and want to connect it to the lora-server, i have to wait until it sends the frame?

That depends on the implementation of your device. I would say that when you reset it, the first thing it does is perform a new OTAA. But again, that fully depends on how the firmware was implemented.