Laravel : Web Api, how to find out if a user (application) is online?

I am building a web service for mobile application by Laravel 5.8. I need to get the location of online users, search on some properties and send a notification to them.

The problem is I can't find out if a user is online. My solution was to keep pushing/receiving a message to applications every 10 seconds once they get connected for the first time. Clearly this approach has a huge overload on the server and is not practical.

I would be appreciated for any help.

Thanks in advance.

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