@Dreded Thank you for your encouragement, I would not fail to contact you for any explanations as simple as you described it.

Thank you for the welcome.
I think your work is wonderful.
I actually place the two proposed lines and it works perfectly...
I am an electronics teacher and I work with 14- and 15-year-old students to set up a connected greenhouse. We're going to use Domoticz on a Rasberry Pi with your work "MySensors".
I would place on the site a small tuto for the set-up. I'd link it to you.
Thank you again.

Hello
I looked at the wiring of the map : https://www.amazon.fr/gp/product/B07N1K16PP/ref=ppx_yo_dt_b_asin_image_o02_s00
It is accessible on : https://github.com/emakefun/emakefun-nano-plus/blob/master/RF-Nano/Schematic/RF-Nano-Schematic.pdf
Connections 9 and 10 are reversed from the recommended connection : https://www.mysensors.org/build/connect_radio
How do I change the library to exchange both legs ?
Thank you very much for your work.