CoreBluetooth centralManagerDidUpdateState() method not getting invoked in Objective-C - ios

Question

I've created a React Native project and I need to discover Bluetooth devices in the background. I'm trying to implement the entire background functionality on the native side using Objective-C.
As an initial step, I'm trying to use CBCentralManager to discover the device in the foreground first and then will move to the background case.
I'm able to call the init function of my custom class which handles BLE functionality but after that CBCentralManagerDelegate methods are not being called and I'm not able to proceed further.
// BLEScan.m
#import <Foundation/Foundation.h>
#import "BLEScan.h"
#interface BLEScan() <CBCentralManagerDelegate>
#property (strong, nonatomic) CBCentralManager *manager;
#property CBPeripheral *dot;
#end
#implementation BLEScan
- (instancetype) initModule {
NSLog(#"BLEScan: init");
if (self = [super init]) {
_manager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue() options:nil];
NSLog(#"BLEScan: state %li", (long)_manager.state);
}
return self;
}
- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
// You should test all scenarios
NSLog(#"BLEScan: state %li", (long)central.state);
if (central.state != CBManagerStatePoweredOn) {
return;
}
if (central.state == CBManagerStatePoweredOn) {
// Scan for devices
[_manager scanForPeripheralsWithServices:nil options:#{ CBCentralManagerScanOptionAllowDuplicatesKey : #YES }];
NSLog(#"Scanning started");
}
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
BLEScan *scanner = [[BLEScan alloc] initModule];
return YES
}
Link to the repo - https://github.com/inkloud-infiswift/CoreBluetooth