@mfalkvidd Thanks a lot for your quick reply.

I had problems with incoming messages ans loop.
If you use nrf24 @Yveaux suggested me to use irq to handle incoming messages.
I my case it solved my problem

https://forum.mysensors.org/topic/7190/irq-pin-for-nrf24l01

Thanks.
Everything is ok.
I now have a node with 3 push-buttons for 3 colors settings and vocals commands for lazy persons or Tony stark. It's for a Iron Man reactor with neopixels...
I wanted to Say : "Jarvis.. Iron Man laser" to have flash effects with neopixels.

For this i use mysensors + jeedom + Google Home mini + ifft.

Need to had Wait(200) in my loop to be sure to receive message from gateway.

Thanks again