By referencing to the Developer Forums, we could handle multiple concurrent sessions using iphone11.
The maximum number of concurrent sessions is two. When we try to connect another one devices, session(_:didInvalidateWith:) on the NISessionDelegate is called with NIError.Code.activeSessionsLimitExceeded.
I'd like to know three or more concurrent sessions are running using newer version like iphone12.
Does anyone have any knowledge?
We tested it on iP12, iP12 mini and iP12 pro. Four devices can work all together (every device has 3 sessions so 12 sessions). After adding fifth device we are receiving NIError.Code.activeSessionsLimitExceeded. Devices are working on 14.8 and 15.0.
Apple documentation https://developer.apple.com/documentation/nearbyinteraction/nierror/3571288-activesessionslimitexceeded?changes=_8 says: "The maximum number of concurrent Nearby Interaction sessions may vary across device type and platform."
Maybe someone tested it on iP13 with iOS15?