.NET Core Web API push to Apple/Android push notification servers

Question

I have Chat service in .NET Core Web API, handling chat messages through Signal R when clients are online.

Also, i have mobile clients (android/apple) and i need to handle messages sent when client is in offline mode. I am aware if clients are offline/online. So, when the client is offline, i want to send message to apple/android push notification server so it can notify the device about new message(s).

Which options do i have to connect net core Web API to android/apple push notification servers? Any experiences with sending client push notifications to mobile clients from .net service?

Answer 1

Use CorePush lib

It's very lightweight. I use it across all my projects to send Firebase Android and Apple iOS push notifications. Useful links:

1. NuGet package
2. Documentation

The interface is very simple and minimalistic:

Send APN message:

var apn = new ApnSender(settings, httpClient);
await apn.SendAsync(notification, deviceToken);

Send FCM message:

var fcm = new FcmSender(settings, httpClient);
await fcm.SendAsync(deviceToken, notification);

Answer 2

You need To make a POST request to https://fcm.googleapis.com/fcm/send with the following parameters Header

• Authorization: key=YOUR_SERVER_KEY
• Content-Type: Application/JSON

Body:

{
 "to" : "YOUR_FCM_TOKEN_WILL_BE_HERE",
 "collapse_key" : "type_a",
 "notification" : {
     "body" : "First Notification",
     "title": "Collapsing A"
 },
 "data" : {
     "body" : "First Notification",
     "title": "Collapsing A",
     "key_1" : "Data for key one",
     "key_2" : "Hellowww"
 }

You can get your server Token from Firebase Console. Also you need to set up APN in order for this to work on iOS. You can find More info here