Some devices don't receive FCM notifications

Question

I'm having a problem since some of my devices where I'm testing my app don't receive their notifications and it doesn't raise an exception.

The notifications comes from FCM and I'm using a custom service to show them.

MyFirebaseMessaginService.java

static int count = 0;
@Override
public void onMessageReceived(final RemoteMessage remoteMessage) {

    Log.i("remoteMessage",remoteMessage.toString());
    switch(remoteMessage.getData().get("tipo")){
        case "normal":
            notificacionNormal(remoteMessage);
            break;
        case "imagen":
            notificacionImagen(remoteMessage);
            break;
        case "imagen+url":
            notificacionImagenUrl(remoteMessage);
            break;
    }
    count++;
    //Log.d("prueba",remoteMessage.getData().get("imagen"));
}

private void notificacionImagenUrl(RemoteMessage remoteMessage) {
    Intent i = new Intent(Intent.ACTION_VIEW);
    i.setData(Uri.parse(remoteMessage.getData().get("url")));
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 100, i, PendingIntent.FLAG_ONE_SHOT);

    NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
    Notification notif = new Notification.Builder(this)
            .setContentIntent(pendingIntent)
            .setContentTitle(remoteMessage.getNotification().getTitle())
            .setContentText(remoteMessage.getNotification().getBody())
            .setSmallIcon(R.mipmap.ic_launcher)
            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
            .setStyle(new Notification.BigPictureStyle().bigPicture(getImagae(remoteMessage.getData().get("imagen"))))
            .build();
    notif.flags |= Notification.FLAG_AUTO_CANCEL;
    notificationManager.notify(count, notif);

}

At the moment it only happens in a rooted device with android 6.0.1 Hope u can help me :)

EDIT: The notification HTTP request I send:

"to": "/topics/general",
        "notification" : {
          "title": "title",
          "body": "body",
        },
        "data": {
          "tipo": "normal",
        }

Answer 1

One of the possible reasons for this might be that some of the devices on which you're testing don't have google play services or the updated version of it. In your activity, try checking for google play services. You may use the function as answered here:

protected boolean checkPlayServices() {
final int resultCode = 

GooglePlayServicesUtil.isGooglePlayServicesAvailable(activity());
    if (resultCode != ConnectionResult.SUCCESS) {
        if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(resultCode, activity(),
                    PLAY_SERVICES_RESOLUTION_REQUEST);
            if (dialog != null) {
                dialog.show();
                dialog.setOnDismissListener(new OnDismissListener() {
                    public void onDismiss(DialogInterface dialog) {
                        if (ConnectionResult.SERVICE_INVALID == resultCode) activity().finish();
                    }
                });
                return false;
            }
        }
        new CSAlertDialog(this).show("Google Play Services Error",
                "This device is not supported for required Goole Play Services", "OK", new Call() {
                    public void onCall(Object value) {
                        activity().finish();
                    }
                });
        return false;
    }
    return true;
}