anticheat-test.com Custom Payload Reference

A reference for all custom payloads supported by this server that clients can interact with.

Warning

Only send these payloads when you are certain the player is connected to anticheat-test.com. It is strongly recommended that you verify this through in-game context - such as scoreboard entries or tab list (player list) information, rather than by checking the server's domain name directly. Sending these payloads to unintended servers could have unexpected consequences.

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sendRawPayload Utility

Modern clients rely on this helper for sending custom payloads. See the implementation here.

sendRawPayload implementation

public static void sendRawPayload(Identifier id, byte[] data) {
    Channel channel = MC.getConnection().getConnection().channel;
    if (!channel.isOpen()) return;

    try {
        final PacketEncoder<?> encoder = (PacketEncoder<?>) channel.pipeline().get("encoder");
        if (encoder == null) return;

        final Object codec = encoder.protocolInfo.codec();
        if (!(codec instanceof IdDispatchCodec)) return;

        final IdDispatchCodec<?, ?, Object> dispatchCodec = (IdDispatchCodec<?, ?, Object>) codec;
        final int packetId = dispatchCodec.toId.getOrDefault(CommonPacketTypes.SERVERBOUND_CUSTOM_PAYLOAD, -1);
        if (packetId == -1) return;

        final FriendlyByteBuf buf = new FriendlyByteBuf(channel.alloc().buffer());
        buf.writeVarInt(packetId);
        buf.writeIdentifier(id);
        buf.writeBytes(data);

        channel.writeAndFlush(buf);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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Anti-Debugger

Sent by the client to notify the server that the /packetdebugger command should be blocked

1.8 Clients

mc.getNetHandler().addToSendQueue(new C17PacketCustomPayload(
    "ACT|Debugger",
    new PacketBuffer(Unpooled.buffer())
));

Field	Value
Channel	ACT|Debugger
Payload	(empty)

Modern Clients

Channel: act_debugger:act_debugger

sendRawPayload(
    Identifier.fromNamespaceAndPath("act_debugger", "act_debugger"),
    new byte[]{}
);

Field	Value
Namespace	act_debugger
Path	act_debugger
Payload	(empty)

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Note-Bot Update (modern server only)

Sent by the client to report the current playback state of a note block song.

Channel: anticheat_test:note_bot_update

Payload Structure

Order	Type	Field	Notes
1	String	songName	Falls back to filename (without .nbs) if empty
2	String	artistName	Falls back to "Unknown" if empty
3	float	targetProgress	Playback progress (0.0 – 1.0)
4	boolean	tuning	Whether tuning mode is active

Sending Example

FriendlyByteBuf buffer = new FriendlyByteBuf(Unpooled.buffer());
String songName = this.song.name;
String artistName = this.song.author;

if (songName == null || songName.isEmpty()) songName = this.song.filename.replaceFirst(".nbs", "");
if (artistName == null || artistName.isEmpty()) artistName = "Unknown";

buffer.writeUtf(songName);
buffer.writeUtf(artistName);
buffer.writeFloat(this.targetProgress);
buffer.writeBoolean(this.tuning);

byte[] bufferData = new byte[buffer.readableBytes()];
buffer.readBytes(bufferData);

sendRawPayload(
    Identifier.fromNamespaceAndPath("anticheat_test", "note_bot_update"),
    bufferData
);