As far as we know, the nRF24L01+ radio is not compatible with the CC2511 on the Wixel. I compared section 7.3 (Enhanced Shockburst packet format) of the nRF24L01+ datasheet to section 13.8.2 (Packet Format) of the CC2511 datasheet, and it looks like the nRF24L01P+ uses a 9-bit packet control field while all of the fields in the CC2511’s packet are multiples of 8 bits. I think this is just one of many differences between the two radios so I doubt you could make them communicate.