Hello, I've got one problem, while I have worked on my new project. This is first time when I tried to use networking in Forge, and also wanted to connect mod with bukkit plugin over PluginMessages.

I've spent a few days to make me understand how can I do this. Used SimpleChannel, and already can handle packets forge-to-forge, but this is useless for my project where server must be vanilla only(Paper/Spigot/Bukkit).

I will be glad if someone will give me some code examples for actual 1.19+ Minecraft versions, where forge mod communicates with bukkit plugins using networking.

This is my Forge code

Main.class

Spoiler

package io.github.liponex.customtasksmod;

import com.mojang.logging.LogUtils;
import io.github.liponex.customtasksmod.events.IsInstalledPacketEvents;
import io.github.liponex.customtasksmod.networking.PluginMessages;
import net.minecraft.client.Minecraft;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.eventbus.api.IEventBus;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
import net.minecraftforge.event.server.ServerStartingEvent;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import org.slf4j.Logger;

@Mod(CustomTasks.MODID)
public class CustomTasks {

    public static final String MODID = "customtasksmod";
    private static final Logger LOGGER = LogUtils.getLogger();

    public CustomTasks() {
        IEventBus modEventBus = FMLJavaModLoadingContext.get().getModEventBus();
        IEventBus forgeEventBus = MinecraftForge.EVENT_BUS;

        modEventBus.addListener(this::commonSetup);
        forgeEventBus.addListener(IsInstalledPacketEvents::onPacketReceive);

        MinecraftForge.EVENT_BUS.register(this);
        MinecraftForge.EVENT_BUS.register(new IsInstalledPacketEvents());
    }

    private void commonSetup(final FMLCommonSetupEvent event) {
        LOGGER.info("CustomTasksMod Setup");

        PluginMessages.register();
    }

    // You can use EventBusSubscriber to automatically register all static methods in the class annotated with @SubscribeEvent
    @Mod.EventBusSubscriber(modid = MODID, bus = Mod.EventBusSubscriber.Bus.MOD)
    public static class ClientModEvents {
        @SubscribeEvent
        public static void onClientSetup(FMLClientSetupEvent event)
        {
            LOGGER.info("CLIENT SETUP");
            LOGGER.info("MINECRAFT NAME >> {}", Minecraft.getInstance().getUser().getName());
        }
    }
}

 

Class that must handle packet IsInstalled

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package io.github.liponex.customtasksmod.events;

import io.github.liponex.customtasksmod.CustomTasks;
import io.github.liponex.customtasksmod.networking.PluginMessages;
import io.github.liponex.customtasksmod.networking.packets.IsInstalledC2SPacket;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.network.NetworkEvent;

@Mod.EventBusSubscriber(modid = CustomTasks.MODID, value = Dist.CLIENT, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class IsInstalledPacketEvents {
    @SubscribeEvent
    public static void onPacketReceive(NetworkEvent.ClientCustomPayloadEvent event) {
        NetworkEvent.ClientCustomPayloadEvent e = event;
        PluginMessages.send(IsInstalledC2SPacket.isInstalled);
    }

}

 

Class PluginMessages that must prepare all for networking

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package io.github.liponex.customtasksmod.networking;

import io.github.liponex.customtasksmod.CustomTasks;
import io.github.liponex.customtasksmod.networking.packets.IsInstalledC2SPacket;
import net.minecraft.resources.ResourceLocation;
import net.minecraftforge.network.NetworkDirection;
import net.minecraftforge.network.NetworkRegistry;
import net.minecraftforge.network.simple.SimpleChannel;

public class PluginMessages {

    private static int packetId = 0;
    private static int id() {
        return packetId++;
    }

    private static final String PROTOCOL_VERSION = "1.0";
    public static final SimpleChannel INSTANCE = NetworkRegistry.newSimpleChannel(
            new ResourceLocation("custom_tasks_mod", "messages"),
            () -> PROTOCOL_VERSION,
            (s) -> true,
            (s) -> true
    );

    public static void register() {
        INSTANCE.messageBuilder(IsInstalledC2SPacket.class, id(), NetworkDirection.PLAY_TO_SERVER)
                .decoder(IsInstalledC2SPacket::new)
                .encoder(IsInstalledC2SPacket::toBytes)
                .consumerMainThread(IsInstalledC2SPacket::handle)
                .add();
    }

    public static <MSG> void send(MSG message) {
        INSTANCE.sendToServer(
            INSTANCE.toVanillaPacket(message, NetworkDirection.PLAY_TO_SERVER));
    }
}

 

Class of IsInstalled packet

Spoiler

package io.github.liponex.customtasksmod.networking.packets;

import com.mojang.logging.LogUtils;
import io.github.liponex.customtasksmod.CustomTasks;
import io.netty.buffer.ByteBufUtil;
import net.minecraft.network.FriendlyByteBuf;
import net.minecraftforge.network.NetworkEvent;
import org.slf4j.Logger;

import java.util.function.Supplier;

public class IsInstalledC2SPacket {
    private static final Logger LOGGER = LogUtils.getLogger();

    public static final boolean isInstalled = true;

    public String text;

    public IsInstalledC2SPacket() {

    }

    public IsInstalledC2SPacket(FriendlyByteBuf buf) {
        text = buf.toString();
    }

    public void fromBytes(FriendlyByteBuf buf) {
        text = buf.toString();
    }

    public void toBytes(FriendlyByteBuf buf) {
        ByteBufUtil.writeUtf8(buf, text);
    }

    public boolean handle(Supplier<NetworkEvent.Context> supplier) {
        NetworkEvent.Context context = supplier.get();
        context.enqueueWork(() -> {
            LOGGER.info(context.toString());
        });
        context.setPacketHandled(true);
        return true;
    }
}

 

My Bukkit code, that I use for sending (ProtocolLib used)

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@EventHandler
public void onPlayerJoin(@NotNull PlayerJoinEvent event) {
    getServer().getConsoleSender().sendMessage("Player join detected!");

    PacketContainer packet = protocolManager.
            createPacket(PacketType.Play.Server.CUSTOM_PAYLOAD);
    packet.getModifier().writeDefaults();

    byte[] bytesTask = "IsInstalled".getBytes(StandardCharsets.UTF_8);

    MinecraftKey channel = new MinecraftKey("custom_tasks_mod", "messages");
    packet.getMinecraftKeys().write(0, channel);

    Object actualData = MinecraftReflection.getPacketDataSerializer(Unpooled.wrappedBuffer(bytesTask));
    packet.getModifier().withType(actualData.getClass()).write(0, actualData);

    try {
        protocolManager.sendServerPacket(event.getPlayer(), packet, false);
    } catch (InvocationTargetException e) {
        getServer().getConsoleSender().sendMessage(e.toString());
    }
}

 

Log from client console

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[Netty Client IO #0/DEBUG] [ne.mi.ne.NetworkRegistry/NETREGISTRY]: Channel 'custom_tasks_mod:messages' : Vanilla acceptance test: ACCEPTED
[Netty Client IO #0/DEBUG] [ne.mi.ne.NetworkRegistry/NETREGISTRY]: Accepting channel list from vanilla
[Render thread/INFO] [minecraft/ConnectScreen]: Connecting to 127.0.0.1, 25565
[Netty Client IO #1/DEBUG] [ne.mi.ne.HandshakeHandler/FMLHANDSHAKE]: Starting new vanilla impl connection.
[Netty Client IO #1/INFO] [ne.mi.ne.NetworkHooks/]: Connected to a vanilla server. Catching up missing behaviour.
[Netty Client IO #1/DEBUG] [ne.mi.co.ForgeConfig/FORGEMOD]: Loaded forge config file forge-server.toml
[Netty Client IO #1/ERROR] [ne.mi.ne.si.IndexedMessageCodec/SIMPLENET]: Received invalid discriminator byte 208 on channel custom_tasks_mod:messages
[Render thread/DEBUG] [ne.mi.ne.fi.NetworkFilters/]: Injected net.minecraftforge.network.filters.VanillaConnectionNetworkFilter@40db6136 into net.minecraft.network.Connection@5ced0537
[Render thread/DEBUG] [io.ne.ut.in.ThreadLocalRandom/]: -Dio.netty.initialSeedUniquifier: 0x854db3e7da8e9393
[Render thread/WARN] [minecraft/ClientPacketListener]: Unknown custom packet identifier: custom_tasks_mod:messages

 

I've solved this it was easier then that ways I've used.

Sources that were changed (if someone fold have the same problem):

For PluginMessages you must use

Spoiler

private static final String PROTOCOL_VERSION = "1.0";

public static final EventNetworkChannel EVENT_NETWORK_CHANNEL = NetworkRegistry.newEventChannel(
    new ResourceLocation("your_channel", "your_subchannel"),
    () -> PROTOCOL_VERSION,
    (s) -> true,
    (s) -> true
);

public static void register() {
    EVENT_NETWORK_CHANNEL.addListener(IsInstalledPacketEvents::onPacketReceive);
}

For IsInstalledPacketEvents

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@Mod.EventBusSubscriber(modid = CustomTasks.MODID, value = Dist.CLIENT, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class IsInstalledPacketEvents {
    private static final Logger LOGGER = LogUtils.getLogger();

    @SubscribeEvent
    public static void onPacketReceive(NetworkEvent.ServerCustomPayloadEvent event) {
        NetworkEvent.ServerCustomPayloadEvent e = event;
        LOGGER.info(event.getPayload().toString(StandardCharsets.UTF_8));
    }

}

 

Then you can handle it as you want. Good luck for everyone!

On 11/14/2022 at 1:49 PM, liponex said:

I've solved this it was easier then that ways I've used.

Sources that were changed (if someone fold have the same problem):

For PluginMessages you must use

  Hide contents

private static final String PROTOCOL_VERSION = "1.0";

public static final EventNetworkChannel EVENT_NETWORK_CHANNEL = NetworkRegistry.newEventChannel(
    new ResourceLocation("your_channel", "your_subchannel"),
    () -> PROTOCOL_VERSION,
    (s) -> true,
    (s) -> true
);

public static void register() {
    EVENT_NETWORK_CHANNEL.addListener(IsInstalledPacketEvents::onPacketReceive);
}

For IsInstalledPacketEvents

  Hide contents

@Mod.EventBusSubscriber(modid = CustomTasks.MODID, value = Dist.CLIENT, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class IsInstalledPacketEvents {
    private static final Logger LOGGER = LogUtils.getLogger();

    @SubscribeEvent
    public static void onPacketReceive(NetworkEvent.ServerCustomPayloadEvent event) {
        NetworkEvent.ServerCustomPayloadEvent e = event;
        LOGGER.info(event.getPayload().toString(StandardCharsets.UTF_8));
    }

}

 

Then you can handle it as you want. Good luck for everyone!

Very cool, how about forge client send custom packet to (Paper/Spigot/Bukkit) server?