Central manager method is not being called .. - ios

Question

i am new to iOS any one please give some suggestion to me.My process to get status about the bluetooth ring scanner. The bluetooth scanner is working fine and my app getting data form the scanner. But now my task is, whenever i open my app ring scanner should connect automatically. and also i want to display the bluetooth status icon in my app.
1) Ring scanner connected already or connected when my app launch - Bluetooth icon (Blue Colour)
2) Ring Scanner not connected - Bluetooth icon (Red colour)
3) Ring Scanner lost connection or sleep due to lack of activity - Bluetooth icon (Grey colour).
i have started working on this concept but centralManager method is not getting called. Here is my code. any one please help me
h.file
#import <CoreBluetooth/CoreBluetooth.h>
#property (nonatomic, strong) NSString *connected;
#property (nonatomic) CBCentralManager *bluetoothManager;
m.file
- (void)viewDidLoad
{
[super viewDidLoad];
_bluetoothManager = [[CBCentralManager alloc] initWithDelegate:self
queue:nil
options:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0]
forKey:CBCentralManagerOptionShowPowerAlertKey]];
}
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
NSString *stateString = nil;
switch(_bluetoothManager.state)
{
case CBCentralManagerStateResetting: stateString = #"The connection with the system service was momentarily lost, update imminent."; break;
case CBCentralManagerStateUnsupported: stateString = #"The platform doesn't support Bluetooth Low Energy."; break;
case CBCentralManagerStateUnauthorized: stateString = #"The app is not authorized to use Bluetooth Low Energy."; break;
case CBCentralManagerStatePoweredOff: stateString = #"Bluetooth is currently powered off.";
{
UIAlertView *BluetoothOff = [[UIAlertView alloc] initWithTitle:#"Warning!!" message:#"Turn ON Bluetooth in setting!" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[BluetoothOff show];
}
break;
case CBCentralManagerStatePoweredOn: stateString = #"Bluetooth is currently powered on and available to use.";
{
// [self.bluetoothManager scanForPeripheralsWithServices:nil options:nil];
[self startScan];
}
break;
default: stateString = #"State unknown, update imminent.";
break;
}
NSLog(#"Bluetooth State: %#",stateString);
}
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral*)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
NSLog(#"DiscoverPeripheral#");
}
-(void)centralManager:(CBCentralManager *)central didRetrievePeripherals:(NSArray *)peripherals
{
NSLog(#"RetrievePeripherals#");
}
-(void)centralManager:(CBCentralManager *)central didRetrieveConnectedPeripherals:(NSArray *)peripherals
{
NSLog(#"RetrieveConnectedPeripherals#");
}
-(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
NSLog(#"Connection Failed#");
}
-(void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
NSLog(#"Disconnected#");
}
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
[peripheral setDelegate:self];
[peripheral discoverServices:nil];
self.connected = [NSString stringWithFormat:#"Connected: %#", peripheral.state == CBPeripheralStateConnected ? #"YES" : #"NO"];
}
- (void) startScan
{
NSLog(#"Start scanning");
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], CBCentralManagerScanOptionAllowDuplicatesKey, nil];
[self.bluetoothManager scanForPeripheralsWithServices:nil options:options];
}

Answer 1

You just save the UUID of the peripheral in your internal database and try to reconnect it after the application launched using the same UUID.
Save it in
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{
NSLog(#"peripheral.identifier=%#",peripheral.identifier.UUIDString);
}
After connecting with the peripheral you can read any value provided by the scanner.