Firebase Cloud Message - Silent notification

[adon...@wersec.com]

Hello,

I'm trying to implement java backend server to send notification via FCM.

As suggested into Firebase documentation, HTTP V1 API is the better way to perform send notification.

Now, I need to send "silent" notification, only to perform refresh operation into app without show notification to user.

With FCM legacy http server protocol, using data payload, notification will be sent without alert notification; android app intercept message into onMessageReceive method and then process its.

Instead, using HTTP V1 API seems that is not possible to send "silent" notification; using data payload or notification payload, Android app show always notification to user into device.

Someone can give me some suggestions?

Thanks