Modifying Data

After you have defined your packets, you can modify, cancel or build and send them manually.

Modifying Packets

You can modify packets by canceling them and sending a modified copy manually. We will use previously defined Set Held Item (clientbound) packet as an example.

[Subscribe]
public async ValueTask OnMessageReceived(MessageReceivedEvent @event, CancellationToken cancellationToken)
{
    if (@event.Message is not SetHeldItemClientboundPacket packet)
        return;

    // Cancel the original packet
    @event.Cancel();

    // Modify the packet
    packet.Slot = 1;

    // Send the modified packet manually
    await @event.Player.SendPacketAsync(packet, cancellationToken);
}