Use Adobe Analytics

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // ... your existing code ..
    MobileCore.registerExtensions([Identity.self, Analytics.self, ....], {
        // ... your existing code ..

        self.sendCSMatchingKeyIfNeeded()
    })
    // ... your existing code ..
}

func sendCSMatchingKeyIfNeeded() {
  let csMatchingKeyTimestampKey = "csMatchingKey_ts"
  let csMatchingKeyValidityMs = 1_800_000 // 30 minutes

  let currentTimestamp = Int(Date().timeIntervalSince1970 * 1000)
  let csMatchingKeyIsPreviousTimestamp = UserDefaults.standard.integer(forKey: csMatchingKeyTimestampKey)

  guard (currentTimestamp - csMatchingKeyIsPreviousTimestamp) > csMatchingKeyValidityMs else {
    return
  }

  UserDefaults.standard.set(currentTimestamp, forKey: csMatchingKeyTimestampKey)

  let csMatchingKey = "csMatchingKey"
  let csMatchingKeyValue = "\(Double.random(in: 0..<1))_\(currentTimestamp)"

  Contentsquare.send(dynamicVar: DynamicVar(key: csMatchingKey, value: csMatchingKeyValue))
  MobileCore.track(state: "csMatchingKey_state", data: [csMatchingKey: csMatchingKeyValue])
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // ... your existing code ..
    [AEPMobileCore registerExtensions:@[AEPMobileEdgeIdentity.class, AEPMobileAnalytics.class] completion:^{
        // ... your existing code ..

        [self sendCSMatchingKeyIfNeeded];
    }];

    // ... your existing code ..
}

- (void)sendCSMatchingKeyIfNeeded {
    NSString *csMatchingKeyTimestampKey = @"csMatchingKey_ts";
    NSInteger csMatchingKeyValidityMs = 1800000; // 30 minutes

    NSInteger currentTimestamp = (NSInteger)([[NSDate date] timeIntervalSince1970] * 1000);
    NSInteger csMatchingKeyIsPreviousTimestamp = [[NSUserDefaults standardUserDefaults] integerForKey:csMatchingKeyTimestampKey];

    if ((currentTimestamp - csMatchingKeyIsPreviousTimestamp) <= csMatchingKeyValidityMs) {
        return;
    }

    [[NSUserDefaults standardUserDefaults] setInteger:currentTimestamp forKey:csMatchingKeyTimestampKey];

    NSString *csMatchingKey = @"csMatchingKey";
    NSString *csMatchingKeyValue = [NSString stringWithFormat:@"%f_%f", (double)arc4random() / UINT32_MAX, currentTimestamp];

    DynamicVar *csMatchingKeyDynamicVar = [[DynamicVar alloc] initWithKey:csMatchingKey
                                                      stringValue:csMatchingKeyValue
                                                            error:(NSError * _Nullable __autoreleasing * _Nullable)];
    [Contentsquare sendWithDynamicVar:csMatchingKeyDynamicVar];
    [AEPMobileCore trackState:@"csMatchingKey_state" data:@{csMatchingKey:csMatchingKeyValue}];
}