did you search? https://developer.apple.com/documentation/nearbyinteraction/discovering_peers_with_multipeerconnectivity

https://developer.apple.com/documentation/nearbyinteraction/implementing_interactions_between_users_in_close_proximity

https://developer.apple.com/videos/play/wwdc2020/10668/ The Nearby Interaction framework streams distance and direction between opted-in Apple devices containing the U1 chip Not necessarily, it says "apple devices with u1 chip", next apple watches have u1 chip