Notice that the CSN line on the radio module is connected to SCK ... The master then switches the pin back to input, allowing the nRF24L01+ to control the line, but doesn’t read yet.

Well, [Ivo] developed a sniffing platform based on an Arduino Uno, a single nRF24L01+ module and a computer running the popular network protocol analyzer Wireshark (part1, part2, part3 of his ...