I upgraded my 3rd Gen iPad to iOS 7.1, while my iPhone 5S is still on 7.0.4. When using the Estimote app on both devices, the iPhone can see the iPad when the iPad is broadcasting, but when the iPhone is broadcasting, the iPad can't see the iPhone.
My colleague tested the Estimote app on iOS 7.1 with an actual physical Estimote iBeacon, and he said it worked fine, so I'm hoping the issue is not with iOS 7.1.
Has there been any testing on iOS 7.1? Has anyone else seen this issue?