core bluetooth crash in iOS 7 - ios

Question

I have developed a bluetooth app, which runs fine on iOS 6, but when I run it on iOS 7 the application crashes in the -didDiscoverPeripheral call back. The crash info suggests that a release is called on the CBPeripheral object. I have used ARC for memory management, here is my declaration,initialisation of the CBPeripheral object and the call back code:
#interface BrLEDiscovery () <CBCentralManagerDelegate, CBPeripheralDelegate> {
CBCentralManager *centralManager;
CBPeripheral *currentperipheral;
BOOL pendingInit;
}
- (id) init
{
self = [super init];
if (self) {
pendingInit = YES;
centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];
currentperipheral=[[CBPeripheral alloc]init];
founddevice=FALSE;
foundPeripherals = [[NSMutableArray alloc] init];
connectedServices = [[NSMutableArray alloc] init];
}
return self;
}
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{ NSLog(#"Found Peripheral %#",[peripheral name]);
if ([[peripheral name] isEqualToString:peripheralname]) {
founddevice=TRUE;
currentperipheral=peripheral;
if (![foundPeripherals containsObject:peripheral]) {
[foundPeripherals addObject:peripheral];
[discoveryDelegate discoveryDidRefresh];
[discoveryDelegate DiscoveryDidFindDevice:peripheral];
}
[RecursiveScanTimer invalidate];
}
}

Answer 1

From your description, it's pretty likely to be crashing on this line:
currentperipheral=peripheral;
To me, it's kinda messy allocating a CBPeripheral object in your init and then assigning the peripheral at an unknown time later (especially with arc). If you want to keep reference to a discovered peripheral, just create a CBPeripheral object in your interface, retain the discovered peripheral, and assign it to your interface peripheral.
Just try something like this:
currentPeripheral = [discoveredPeripheral retain];//where discoveredPeripheral is the one given in the delegate callback
I personally don't use arc for any of my corebluetooth related applications..You need to be really careful with the corebluetooth framework and peripheral references though...it gets messyyy.
Note: If you do not always need to have direct contact with the peripheral, it's often handy to just keep a record of the CFUUIDRef (or identifier for iOS 7) and just retrieve the peripheral whenever you need it... Good luck!