title: FCM push notification to all devices which will be filtered on client side
body: <p>Okay, I know the question may sound stupid. I’m building an app where there are pages that publish posts and users can subscribe/unsubscribe to those pages. </p>
  
  <p>The goal here is to find a way to send notifications whenever a new post is published but only to the subscribed users. I though that I can do this by sending a push notification to all the devices on my app whenever the “Posts” reference is updated on Firebase database, and then choose whether to show this notification or not if the user is subscribed (on client side)</p>
  
  <p>Is this a good idea? And if yes, how can I accomplish that?</p>