metti gli sketch tra i tag code cosi si guardano
https://www.google.it/search?q=nrf24l01+network+topology&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjImpDC2KDbAhWlC5oKHVQ4CfMQsAQIKA&biw=1536&bih=779#imgrc=0eEC13AxtrYUsM: