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by Wolfmans55
702 days ago
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So overall, the site including the buzzer page uses websockets for (close to) real-time client-server communication. Obviously latency can be an issue, so my non-perfect B+ solution is to essentially calculate the round trip of the buzz, divide it by 2, and subtract it from the server time. client ------------ pingTime ------------> server client <----------- serverTime ----------- server roundTrip = pingTime + pongTime buzzTime = serverTime - (roundTrip / 2); The server time is always the source of truth since client times can vary. Not using NTP which could possibly be more accurate. |
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