[question]: How to handle the Silent Notification in release version 3.x.x? is there any guides or sample codes.

[009topersky]

How can we help?

Good day everyone!

We've been using OneSignal for quite some time and implemented it for several projects.
We migrated the version of OneSignal from 2.x.x into 3.x.x and it seems fine.

The problem is that we have some implementation in silent notification wherein there are no headings and contents.

To simulate the issue.

STEP 1:
We sent the data from the OneSignal REST API

POST: https://onesignal.com/api/v1/notifications

HEADERS:
Authorization: Bearer <ONESIGNAL_REST_API_KEY>

**PAYLOAD: **

{   
    "app_id": "ONESIGNAL_APP_ID",
     "huawei_msg_type": "data",
     "data": {"notificationContext": "timelog-break-out"},
     "content_available": true,
     "include_external_user_ids": ["Supervisor-external-id1"],
     "isAppInFocus": true
}

STEP 2:
In ionic 3 framework under the upon initialization of app based on the documentation
https://documentation.onesignal.com/docs/ionic-sdk-setup.

import OneSignal from 'onesignal-cordova-plugin';
...
constructor() {
    OneSignal.setAppId(environment.ONESIGNAL_APPID);
    
    // Actions for opening the push notification
    OneSignal.setNotificationOpenedHandler(function(notificationOpenedEvent) {
        console.log('setNotificationOpenedHandler:::', notificationOpenedEvent);
        const notif = notificationOpenedEvent.notification;
        notificationOpenedCallback(notif);
      });

    // Actions when receiving the notification in forebackground
     OneSignal.setNotificationWillShowInForegroundHandler(function(notificationReceivedEvent) {
        console.log('setNotificationWillShowInForegroundHandler:::', notificationReceivedEvent);
        const notif: any = notificationReceivedEvent.getNotification();
   
        notificationShowCallback(notif);
        notificationReceivedEvent.complete(notif);
      });
}
...

My goal is that the application should receive silent notifications even if the app is idle or in the background.

We already checked this documentations:
https://documentation.onesignal.com/docs/service-extensions#section-notification-extender-service
and
https://documentation.onesignal.com/docs/data-notifications

but there are no specific docs that pertain to the implementation of backgrounds/silent notifications.

Sample codes and implementations could help us solve the issue.

Thanks.
Have a nice day!

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[matheusssoares]

I have the same problem, any examples to help?

[anatoly-spb]

I have proposed the following PR #876 to support data/background messages on Android

[anatoly-spb]

It seems to me we have to migrate to Firebase SDK from OneSignal SDK, because there are no one to maintain this project.

[jkasten2]

Silent notifications come with a lot of caveats; limitations and reliability as they can be dropped by Google or Apple. Silent notifications are also normally not the best solution, XMPP or making A REST API call to your server on app might be a better fit for what you are doing.

OneSignal only supports silent notifications with it's native interfaces (Objective-c / Swift or Java / Kotlin). See the documentation on doing so here:
https://documentation.onesignal.com/docs/data-notifications