Why Use Corebluetooth Connectperipheral Did Not Call Delegate Methods in iOS8

iOS CoreBluetooth : centralManager:didConnectPeripheral / didFailToConnectPeripheral: not getting called

If you don't somehow retain the peripheral object that is delivered to didDiscoverPeripheral then it is released once this delegate method exits and you won't get a connection.

I suggest adding a property to track discovered peripherals

@property (strong,nonatomic) NSMutableArray *peripherals;

initialise this in viewDidLoad or init

self.peripherals=[NSMutableArray new];

And then add the peripheral to it in didDiscoverPeripheral

-(void) centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSLog(@"Discovered peripheral %@",peripheral.identifier.UUIDString);
    [self.peripherals addObject:peripheral];
    [central connectPeripheral:peripheral options:nil];
}

iOS 8 CoreBluetooth deprecated RSSI methods

There is a known issue that has been posted about this on the Apple Developer forums to which I have an open radar as well.

The issue seems to be that the new callback method peripheral:didReadRSSI:error: is never called on iOS 8 specifically after the initial connection is made to a peripheral. The only resolution I have found is to reset bluetooth on your phone by turning it on/off or restarting the phone.

Here is the link to open radar I filed.

UPDATE:

Just tested my example that was displaying this issue with the current 8.2 release and I am no longer seeing any issues with the new iOS 8 delegate method never being called. I am marking my radar as resolved per the 8.2 release.

Callback from CBCentralManagerDelegate to retrieve CBPeripheral on IOS8

It looks like in your original example, you aren't saving a local copy of the CBPeripheral.

From the CBCentralManager Class Reference - connectPeripheral:

Pending connection attempts are also canceled automatically when peripheral is deallocated.

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