Open Radar

 
I´m building an SDK that relies heavily on the iBeacon ranging and monitoring. Several customer are using our SDK already but they are reporting weird behavior, which I´m now sure is a bug in iOS 7.1

I was able to get my hands on three devices which experienced the bug. Rebooting 2 fixed the undesired behaviour. One device had a broken on/of button, so rebooting was not an option. I was able to connect that device to XCode and install Apple´s sample application AirLocate with some additional proximity UUIDs added (8 in total). I had it running with breakpoints and came to the following conclusions.

One customer reported getting the the kCLErrorDomain error 5 (monitored too many regions) but the app he was using was only monitoring 9 regions. Restarting the device fixed the error.

We´ve also been in non-technical call with some Apple employees from Munich, one of them reported this behaviour as well. Rebooting fixed his phone as well.

**Steps to reproduce**
Don´t reboot the device for some days. iBeacon based apps stop working.

All other BTLE related APIs seem to work fine. I was able to connect to a TI Sensortag  and scan for peripherals..

Reboot the device and iBeacon ranging and monitoring start working again.

You can use the AirLocate <https://developer.apple.com/library/ios/samplecode/AirLocate/Introduction/Intro.html> sample API and some iBeacons to reproduce the behviour if a device is affected.

**Expected Results**
iBeacon ranging and monitoring callbacks should trigger callbacks. CLLocationManager does not call either of the two callbacks:

	- (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region
	
	- (void)locationManager:(CLLocationManager *)manager rangingBeaconsDidFailForRegion:(CLBeaconRegion *)region withError:(NSError *)error
	
neither does the Region Monitoring call any of the callbacks:

	- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
	
	- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
	
	- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error

**Actual Results**

No callbacks at all.

**Configuration**
direct contact with customers experiencing the problem who had the following devices:

* iPhone5
* iPad3
* iPhone5s

**Version/Build**
Only seen with devices running iOS 7.1

**Additional Notes**
I´ve yet been able to reproduce the problem sucessfully.

Other resources online from people experiencing the bug:

* <http://stackoverflow.com/questions/20164952/cllocationmanager-kclerrordomain-codes>
* <http://stackoverflow.com/questions/20905843/locationmanagerrangingbeaconsdidfailforregionwitherror-kclerrordomain-16>
* <http://stackoverflow.com/questions/23029197/monitoringdidfailforregion-when-regioning-for-ibeacon-kclerrordomain-error-5>