Build local push connectivity for restricted networks

10:07 - Create Configuration

import NetworkExtension

let manager = NEAppPushManager()
manager.matchSSIDs = [ "Cruise Ship Wi-Fi", "Cruise Ship Staff Wi-Fi" ]
manager.providerBundleIdentifier = "com.myexample.SimplePush.Provider"
manager.providerConfiguration = [ "host": "cruiseship.example.com" ]
manager.isEnabled = true

manager.saveToPreferences { (error) in
    if let error = error {
        // Handle error
        return
    }
    // Report success
}

11:11 - App Extension life cycle management and reporting VoIP call

// Manage App Extension life cycle and report VoIP call 

class SimplePushProvider: NEAppPushProvider {

    override func start(completionHandler: @escaping (Error?) -> Void) {
        // Connect to your provider server       
        completionHandler(nil)
    }

    override func stop(with reason: NEProviderStopReason,
                                   completionHandler: @escaping () -> Void) {
        // Disconnect your provider server
        completionHandler()
    }
    
    func handleIncomingVoIPCall(callInfo: [AnyHashable : Any]) {
        reportIncomingCall(userInfo: callInfo)
    }
}

11:57 - Handling incoming VoIP call in the containing app

class AppDelegate: UIResponder, UIApplicationDelegate, NEAppPushDelegate {
    func application(_ application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions:       
                     [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        NEAppPushManager.loadAllFromPreferences { (managers, error) in
            // Handle non-nil error
            for manager in managers {
                manager.delegate = self
            }
        }
        return true
    }
    
    func appPushManager(_ manager: NEAppPushManager,
                didReceiveIncomingCallWithUserInfo userInfo: [AnyHashable: Any] = [:]) {
        // Report incoming call to CallKit and let it display call UI
    }
}