I need a presence system for my application. I need to display if they're "online" or "offline" based on whether they're able to communicate with the server or not. Firebase seems to have had a solution to this, but the Firebase realtime database costs money to use, which we're not interested in since it's just a school project we're finishing up. Are there any other solutions for Node.js and Android for a system like this?
via Michael Blake
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