Did iOS 7.1 break 4S iBeacon support? Proximity is always CLProximityUnknown on 4S and RSSI is always zero. Please help, in the middle of beta testing

Question

After I updated my 4S to iOS 7.1 my wifi suddenly stopped working, which is okay since I like the challenge of optimizing my app's performance. However, I've also noticed that iBeacon ranging may not be working properly as the "proximity" is always reported as CLProximityUnknown and the RSSI value is always zero. Just to clarify, the UUID, major and minor are being read as expected. It's just the proximity functionality that appears to be misfiring.

Given that my wifi stopped working, perhaps my 4S's hardware is simply failing. That being said, has anyone else seen this issue?

This is important because my app ignores iBeacons whose proximity is unknown. I may just get rid of this check though. Does anyone know if CLProximityUnknown mean the beacon is further away than CLProximityFar? Or does it simply just mean it wasn't able to determine the beacon's proximity?

UPDATE:

It's my 4S (which is kind of a relief). Looks like updating to iOS 7.1 fried my chip. =(

Thanks for the help guys!

UPDATE 2

Putting my iPhone 4S in the refrigerator for 30 minutes actually did the trick. My wifi works now too (likely temporary though as it'll probably overheat again). x_x

Answer 1

CoreLocation still works in 7.1 on the iPhone 4S. See my detailed test results here, which were done on a 4S. So this is most likely an issue with your test setup, either the phone, the beacon or a combination of both.

First, do a reboot to see if the problem still persists as @gokhan-karaca suggests. Then try another iBeacon (what kind are you using now?), ideally an iOS-based one if you have a second device to test with. It may be that a software filter on the RSSI is rejecting the value measured by the bluetooth chip for some reason.

Answer 2

Did you try to restart the iPhone.

ibeacon does not apear in iPhone 4S

The solution ended up being simply rebooting the iPhone as discussed in the comments below.

Answer 3

Today I read this.. I was really going crazy about that. http://beekn.net/2014/05/beacon-bug-apple-loses-ibeacon-ranging-drives-developers-mad/