Websocket for real-time quiz application

[Lukas Mayer]

I am in the implementation of a “one server-many client” type application, which means quiz question should be broadcasted from a privileged user to all the users and after that results should be collected. Question is the web service part, where real-time communication should happen.

[Tim Moores]

Question is the web service part, where real-time communication should happen.

What, exactly, is the question? (I'm assuming that you don't actually mean real-time, as that would be impossible over a mobile or even Wifi network -which I'm assuming you're talking about since you posted this in the Android forum.)

If the client is a native app you could use notifications like Google's FCM. If, OTOH, you mean a web client, then in addition to web sockets you might want to look into Server-sent events. Both are supported in current versions of Firefox and Chrome for Android.

[Lukas Mayer]

There are two types of users in this case, privileged users are, who can send answers to another users. Real-time means in this case, that question have to appear immediately after sending to standard users.

[Tim Moores]

You may have to build a prototype app to test what latency you might get. Assuming a solution using a central server (located who knows where, such as FCM) you'll likely have to contend with delays measured in seconds.