This library for Bukkit allows you to have greater control over the packets sent and received on the server. You can modify packet, execute actions and cancel the packet.

It allows packets to be retrieved in an event system similar to that of Bukkit. You can also pause the program while waiting for a packet to be sent or received.

Note: This library is currently only compatible with Minecraft 1.18.2.

First, you need to tell the api which classes contain handlers. This action is usually in the JavaPlugin#onEnable().

PacketListener.registerListeners(this, ServerboundPackets.class, ClientboundPackets.class, ...);

Afterwards, to create a handler you must create a method in public static void with the annotation @PacketHandler and in parameter PacketEvent<?> by replacing the ? by the desired packet, or leave it if you want your method to handle all packets.

@PacketHandler
public static void inChat(PacketEvent<ServerboundChatPacket> event) {
    // do something
    // you can prevent the packet from being sent or received with
    event.setCancelled(true);
}

This API also allows you to wait for a packet through a blocking method

PacketListener.waitPacket(ServerboundSignUpdatePacket.class /* The packet class */,
        Bukkit.getPlayer("DailyCraft") /* The player */,
        event -> {} /* A Consumer with a PacketEvent for make actions with the packet */,
        1000 /* A timeout in ms. Note: this arg is optional */);

And there's also PacketListener.waitPacketAsync(...) so the method isn't blocking because running in an async thread. Note: The arguments are the same except that you must add the instance of your JavaPlugin class as the first argument.

You can find an example here