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Discussion in 'APIs' started by TPGamesNL, Aug 3, 2020.

  1. TPGamesNL

    Supporter Addon Developer Dev Programme

    Jan 20, 2018
    Likes Received:
    With this script you can listen to, modify and cancel NMS (net.minecraft.server) packets being sent / received.

    Required addons:
    Packet event:
    Code (Text):
    1. packet [<(.+)>]
    Within this event the event-values player and string are usable: player is the player that sent / received the packet, string is the simple name of the packet class.
    The regex represents the simple name of the packet class, this class doesn't need to be imported. You can also not include this part, and the trigger will be called for every packet.

    Code (Text):
    1. [event-]packet

    Code (Text):
    1. on packet PacketPlayInChat:
    2.     send "&a%player% said %packet.a%" to console
    3.     cancel event
    Code (Text):
    1. on packet PacketPlayInChat:
    2.     set packet.a to "Hello there!"

    Be aware that NMS packets aren't nice to deal with, as they're undocumented, obfuscated and inconsistent between Minecraft server versions. To know what fields you need, you'll have to look at the source code of your server. A resource that can help you a little is the Protocol page of wiki.vg, where the Minecraft protocol is documented. This page documents the packets and their usage, and documents the protocol fields. These protocol fields are different from the fields from nms packets, but they are often similar, so they can help you get started.

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