Fix sending discriminator byte for ClientHello

Author: iceiix

src/server/mod.rs

@@ -701,6 +701,7 @@ impl Server {
     }
 
     fn write_plugin_message(&mut self, channel: &str, data: &[u8]) {
+        println!("Sending plugin message: channel={}, data={:?}", channel, data);
         if self.protocol_version >= 47 {
             self.write_packet(packet::play::serverbound::PluginMessageServerbound {
                 channel: channel.to_string(),

src/server/plugin_messages.rs

@@ -34,7 +34,7 @@ impl<'a> FmlHs<'a> {
     pub fn as_message(&'a self) -> Vec<u8> {
         match self {
             FmlHs::ClientHello { fml_protocol_version } => {
-                vec![*fml_protocol_version as u8]
+                vec![1, *fml_protocol_version as u8]
             },
             _ => unimplemented!()
         }