The RFLink (433mhz) has a great PCB (for Mega though) that has both Nrf24+ slot and 433 transiever slot - but at this moment the only thing implemented is the 433mhz function - so its a bit of work.

I have a serial gateway. I've talked about wi-fi only for comparaison, but... It seem that it's not really comparable. Thanks for your answers anyway !

It's because at the very beginning, it was for the 110v-230v-ac-to-mysensors-pcb-board. And the space taken by the arduino-nano in this particular project. And i keep thinking this way. But there is no way that I put free cable without protection in hight voltage area ! And you people, don't do it too ! :boom:

@martinhjelmare Stupid me! Thanks for bringing this up - these issues are so simple, but very easy to overlook. I was about to start pulling my hair out....