@Geelbuik it is a known issue, see https://github.com/mysensors/MySensors/issues/1458 tobof created this issue in mysensors/MySensors open Recursive call of process() and wait() when using signing #1458

actually it is thanks a lot

@flyingdomotic certainly. But I do not have time for MySensors development at the moment, only support. But pull requests are always welcome!

@Søren-Heide-Larsen different networks can be achieved by setting different channels / network ID. See here for NRF24 and here for RFM69. There is no pairing function in MySensors.