It's using SSE as well... there are a few ways to do it, here's an example https://github.com/neilco/EventSource/ I'm doing something quite similar in swift, had I known about this, I probably would have just dropped it in!
Every player uses their own phone and that part is just straight JavaScript.
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Is the app itself using HTML or TVML? If I recall correctly, it's against Apple's TOS to use a WebView on tvOS.
The AppleTV part of the app is native tvOS.
It's using SSE as well... there are a few ways to do it, here's an example https://github.com/neilco/EventSource/ I'm doing something quite similar in swift, had I known about this, I probably would have just dropped it in!
Every player uses their own phone and that part is just straight JavaScript.