Sending data from the Spigot server to the Fabric 1.21 client

[Salwarex]

Description

Hi! I'm new to this topic. I want to make a connection between the server on Spigot and the Fabric client mod (API 1.21). I tried to follow the information from the wiki, but in my case, only the transfer from the client to the server works, but the data does not arrive from the server to the client. Does anyone know what the problem is?

Fabric (client):

  @Override
    public void onInitializeClient() {
        ClientPlayConnectionEvents.JOIN.register((handler, sender, client) -> {
            PayloadTypeRegistry.playC2S().register(PacketServer.ID, PacketServer.CODEC);
            PayloadTypeRegistry.playS2C().register(PacketServer.ID, PacketServer.CODEC);

            ClientPlayNetworking.registerGlobalReceiver(PacketServer.ID, (payload, context) -> {
                String receivedData = payload.toString();
                context.client().execute(() -> {
                    System.out.println("Received from server: " + receivedData);
                });
            });
        });
    }

public record PacketServer(String message) implements CustomPayload {
    public static final CustomPayload.Id<PacketServer> ID = new CustomPayload.Id<>(Identifier.of("beemanity", "mod_channel"));
    public static final PacketCodec<PacketByteBuf, PacketServer> CODEC = PacketCodec.of(
            (buf, packet) -> packet.writeString(buf.message),
            buf -> new PacketServer(buf.readString())
    );

    @Override
    public Id<? extends CustomPayload> getId() {
        return ID;
    }
}

Spigot:

public static void sendData(Player player, String data) {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        DataOutputStream out = new DataOutputStream(byteArrayOutputStream);

        try {
            out.writeUTF(data);
        } catch (IOException e) {
            e.printStackTrace();
        }

        player.sendPluginMessage(MainClass.getInstance(), CHANNEL, byteArrayOutputStream.toByteArray());

    }