func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
     // setup registration
    let registration = DeviceRegistration(serverURL: URL(string: "<# URL of the running AeroGear UnifiedPush Server #>")!)

    // attemp to register
    registration.register(clientInfo: { (clientDevice: ClientDeviceInformation!) in
        // setup configuration
        clientDevice.deviceToken = deviceToken
        clientDevice.variantID = "<# Variant Id #>"
        clientDevice.variantSecret = "<# Variant Secret #>"

        // apply the token, to identify THIS device
        let currentDevice = UIDevice()

        // --optional config--
        // set some 'useful' hardware information params
        clientDevice.operatingSystem = currentDevice.systemName
        clientDevice.osVersion = currentDevice.systemVersion
        clientDevice.deviceType = currentDevice.model
        },

        success: {
            print("UnifiedPush Server registration succeeded")
        },
        failure: {(error: Error!) in
            print("failed to register, error: \(error.localizedDescription)")
        })
}

  func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
     // setup registration
    let registration = DeviceRegistration(config: "pushconfig")

    // attemp to register
    registration.register(clientInfo: { (clientDevice: ClientDeviceInformation!) in
        // setup configuration
        clientDevice.deviceToken = deviceToken
        let currentDevice = UIDevice()
        // set some 'useful' hardware information params
        clientDevice.operatingSystem = currentDevice.systemName
        clientDevice.osVersion = currentDevice.systemVersion
        clientDevice.deviceType = currentDevice.model
        },       
        success: {
            print("UnifiedPush Server registration succeeded")
        },
        failure: {(error: Error!) in
            print("failed to register, error: \(error.localizedDescription)")
        })
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        PushAnalytics.sendMetricsWhenAppLaunched(launchOptions: launchOptions)
        return true
    }

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        // Send metrics when app is launched due to push notification
        PushAnalytics.sendMetricsWhenAppAwoken(applicationState: application.applicationState, userInfo: userInfo)

        // Do stuff ...
        fetchCompletionHandler(UIBackgroundFetchResult.noData)
    }