In reply to Phil B.

Hello Phil. As Vikas mentioned, Cisco intends to certify the CGR1240. So yes, any certified FAN device will interoperate with a certified CGR1240.

Do note that FAN's certification scope is UDP down through the radio (OSI layers 1-4). Further details about the FAN stack can be had from a recent Wi-SUN presentation to IETF.

https://datatracker.ietf.org/meeting/97/materials/slides-97-lpwan-35-wi-sun-presentation-00