Firebase FCM silent push notifications for iOS

Question

I have a problem with silent notifications on iOS.

When my application is in background, I don\'t receive silent notification sent by FCM. But if I try to send direc

Answer 1

I found an workaround. I put an empty value for "sound" in "notification" field and the silent notifications are delivered even when the application is in background.

{ 
    "to" : "...",
    "priority": "high",
    "notification": {
        "sound": ""
    },
    "data" : {
      ....
    }
}

My hunch is that Apple does not allow silent notifications with a 'high' priority and somehow "notification": {"sound": ""} tricks the APNS that this notification is not a silent one.