How to check if a user is online before sending a push in Chrome?

Question

Push technologies

Hello!
Is it possible to somehow check in the push api for Chrome that the user is online?
What's the problem: I'm making a chat for the site, managers have a shift schedule, you need to send notifications only to those managers who work today, and in general to know if there are managers online or not. Is there a way to do this via the push api for Chrome?

Answer 1

I doubt that this is possible through push api
Here is an article about another way