Xamarin Firebase for iOS giving fcm 501 error - ios

Question

I have been struggling with this for several days and have found many other posts on the subject, but nothing seems to fix the problem I have. I have a feeling this might be simple as I have tried this several times with cut down projects and always get the same failure. I can receive Firebase messages fine in Android, but iOS consistently defeats me.
I am using a phone with iOS 10 as a test. The debug code always gets a token back, but on connecting, an error 'The operation couldn’t be completed. (com.google.fcm error 501.)' is returned. I attach some sample code - this has been bodged around in frustration
public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate, IUNUserNotificationCenterDelegate, IMessagingDelegate
{
//
// This method is invoked when the application has loaded and is ready to run. In this
// method you should instantiate the window, load the UI into it and then make the window
// visible.
//
// You have 17 seconds to return from this method, or iOS will terminate your application.
//
public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
global::Xamarin.Forms.Forms.Init ();
LoadApplication (new FirebaseTest.App (""));
RegisterForNotificationFCM();
return base.FinishedLaunching (app, options);
}
void RegisterForNotificationFCM()
{
// Register your app for remote notifications.
if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0))
{
// iOS 10 or later
var authOptions = UNAuthorizationOptions.Alert | UNAuthorizationOptions.Badge | UNAuthorizationOptions.Sound;
UNUserNotificationCenter.Current.RequestAuthorization(authOptions, (granted, error) => {
Console.WriteLine(granted);
});
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.Current.Delegate = this;
// For iOS 10 data message (sent via FCM)
Messaging.SharedInstance.Delegate = this;
}
else
{
// iOS 9 or before
var allNotificationTypes = UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound;
var settings = UIUserNotificationSettings.GetSettingsForTypes(allNotificationTypes, null);
UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
}
UIApplication.SharedApplication.RegisterForRemoteNotifications();
Firebase.Analytics.Loader loader1 = new Firebase.Analytics.Loader();
Firebase.InstanceID.Loader loader2 = new Firebase.InstanceID.Loader();
//Firebase.Core.App.Configure();
Firebase.InstanceID.InstanceId.Notifications.ObserveTokenRefresh((sender, e) =>
{
var newToken = Firebase.InstanceID.InstanceId.SharedInstance.Token;
System.Diagnostics.Debug.WriteLine(newToken);
connectFCM();
});
}
public override void DidEnterBackground(UIApplication uiApplication)
{
Messaging.SharedInstance.ShouldEstablishDirectChannel = false;
}
public override void OnActivated(UIApplication uiApplication)
{
base.OnActivated(uiApplication);
}
public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
{
Messaging.SharedInstance.ApnsToken = deviceToken;
connectFCM();
//Firebase.InstanceID.InstanceId.SharedInstance.SetApnsToken(deviceToken, Firebase.InstanceID.ApnsTokenType.Prod);
}
public void DidRefreshRegistrationToken(Messaging msg, string str)
{
}
//Fire when background received notification is clicked
public override void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo, Action<UIBackgroundFetchResult> completionHandler)
{
//Messaging.SharedInstance.AppDidReceiveMessage(userInfo);
System.Diagnostics.Debug.WriteLine(userInfo);
// Generate custom event
NSString[] keys = { new NSString("Event_type") };
NSObject[] values = { new NSString("Recieve_Notification") };
var parameters = NSDictionary<NSString, NSObject>.FromObjectsAndKeys(keys, values, keys.Length);
// Send custom event
Firebase.Analytics.Analytics.LogEvent("CustomEvent", parameters);
if (application.ApplicationState == UIApplicationState.Active)
{
System.Diagnostics.Debug.WriteLine(userInfo);
var aps_d = userInfo["aps"] as NSDictionary;
var alert_d = aps_d["alert"] as NSDictionary;
var body = alert_d["body"] as NSString;
var title = alert_d["title"] as NSString;
//debugAlert(title, body);
}
}
[Export("userNotificationCenter:willPresentNotification:withCompletionHandler:")]
public void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
{
// Do your magic to handle the notification data
System.Console.WriteLine(notification.Request.Content.UserInfo);
}
// Receive data message on iOS 10 devices.
public void ApplicationReceivedRemoteMessage(RemoteMessage remoteMessage)
{
Console.WriteLine(remoteMessage.AppData);
}
private void connectFCM()
{
//Messaging.SharedInstance.ShouldEstablishDirectChannel = true;
//Messaging.SharedInstance.Subscribe("/topics/topic");
Messaging.SharedInstance.Connect((error) =>
{
if (error == null)
{
Messaging.SharedInstance.Subscribe("/topics/topic");
}
System.Diagnostics.Debug.WriteLine(error != null ? "error occured" : "connect success");
});
}
These functions have been removed from many other posts on the same subject as happens when you get more and more desperate. I think the firebase console has been set up okay. I have added the iOS as an app along side the working Android one and have added an authentication key created on the Mac. (surprisingly I still get a token back even without this iOS app as part of the firebase project - not what I expected) A certificate has been created for this app and the provisioning profile has been recreated and old ones deleted.
I'm not sure what else to add - someone please put me out of my misery...

Answer 1

Got there in the end. Things for other people to check on - Moved App.Configure() into connectFCM
private void connectFCM()
{
Firebase.Core.App.Configure();
Messaging.SharedInstance.ShouldEstablishDirectChannel = true;
}
and added the following to info.plist
<key>NSExceptionDomains</key>
<dict>
<key>firebaseio.com</key>
<dict>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<true/>
<key>NSIncludesSubdomains</key>
<true/>
</dict>
</dict>
<key>UIBackgroundModes</key>
<array>
<string>remote-notification</string>
</array>