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javaudppingmultiplayer

How to check player's latency in java

How do I see how many milliseconds of ping a client has? I haven't tried anything yet because I don't have a clue what to do, if I search it online, I only get answers on how to ping in java, which is not what I need!

Solution

  • A ping / latency typically refers to the time it takes for an update packet to reach the destination (and back). So one way to determine the ping of a client from the server is to send some tiny packet from the client to the server with a field that looks something like this:

    long sentMillis = System.currentTimeMillis();

    which would contain the time in milliseconds when the packet was sent. Since you know when you got the packet on the server, capture current time in milliseconds:

    long receivedMillis = System.currentTimeMillis();

    Now, trivially:

    // time from client to server
long ping = receivedMillis - sentMillis;