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Thread: Unhinged PCARS 2 UDP Packet Speculation

  1. #1
    Superkart Pilot SenorPez's Avatar
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    Cool Unhinged PCARS 2 UDP Packet Speculation

    Because I'm bored...

    Assuming my packet capture tool is functioning correctly (a somewhat large assumption), the following packets, identified by size and count, were captured during a 15 minute Ginetta Juniors race (12 laps completed, 20 cars total):

    Size: 993 bytes, Count: 21383
    Size: 538 bytes, Count: 21541
    Size: 784 bytes, Count: 430
    Size: 24 bytes, Count: 170

    My speculation:
    The 538 byte packet is the player car data.
    The 993 byte packet is the AI car data, all included in a single packet. I'd have to run a race with a different field size to see if this packet size changes based on the field, or if it's padded to account for a maximum field size (56?).
    The 784 byte packet is the player and AI name data. Sent at a lower update rate.
    The 24 byte packet is curious; that's not a lot of data and it's sent very infrequently. Weather and/or track updates?

    The first two bytes of every PCARS packet was the build version number. That isn't the case for PCARS 2 packets, from my "just try to grab the first two bytes and read an unsigned short" testing. (I didn't go further.)
    Project CARS Replay Enhancer (Thread): http://forum.projectcarsgame.com/sho...eplay-Enhancer
    Kobernulf Monnur's Driver Journey: https://www.youtube.com/playlist?lis...mO1D9jU200jcWJ

  2. #2
    Superkart Pilot SenorPez's Avatar
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    Some of this is probably wrong. In the course of screwing around I found a bug in the packet capture.
    Project CARS Replay Enhancer (Thread): http://forum.projectcarsgame.com/sho...eplay-Enhancer
    Kobernulf Monnur's Driver Journey: https://www.youtube.com/playlist?lis...mO1D9jU200jcWJ

  3. #3
    Superkart Pilot SenorPez's Avatar
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    From the old PCARS 3rd Party Apps forum... and given cjorgens's status as both a trusted developer and WMD member, I'd say it's fairly solid information:

    Quote Originally Posted by cjorgens79 View Post
    The PCARS2 UDP protocol is unfinished which is why there are no officially released specs.
    My takeaway: Capturing packets right now for future use would then be pointless, since the spec, once finalized, will be updated with a patch. Again, disappointing, but there's nothing we can do about it right now.
    Project CARS Replay Enhancer (Thread): http://forum.projectcarsgame.com/sho...eplay-Enhancer
    Kobernulf Monnur's Driver Journey: https://www.youtube.com/playlist?lis...mO1D9jU200jcWJ

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