build.gradle

@@ -17,7 +17,6 @@ repositories {
 
 dependencies {
     implementation 'com.github.steveice10:mcprotocollib:1.19.1-SNAPSHOT'
-    //implementation 'com.github.steveice10:mcprotocollib:1.19-1'
     implementation 'commons-cli:commons-cli:1.5.0'
     implementation 'com.diogonunes:JColor:5.2.0'
     implementation 'dnsjava:dnsjava:3.4.3'

src/main/java/me/creepermaxcz/mcbots/Bot.java

@@ -18,7 +18,7 @@ import com.github.steveice10.packetlib.tcp.TcpClientSession;
 import java.net.InetSocketAddress;
 import java.time.Instant;
 import java.util.ArrayList;
-import java.util.HashMap;
+import java.util.UUID;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -30,6 +30,7 @@ public class Bot extends Thread {
     private ProxyInfo proxy;
     private InetSocketAddress address;
     private Session client;
+    private UUID uuid;
     private boolean hasMainListener;
 
     private double lastX, lastY, lastZ = -1;
@@ -40,6 +41,7 @@ public class Bot extends Thread {
         this.nickname = nickname;
         this.address = address;
         this.proxy = proxy;
+        this.uuid = UUID.randomUUID(); // Add random UUID for sending message.
 
         Log.info("Creating bot", nickname);
         protocol = new MinecraftProtocol(nickname);
@@ -108,7 +110,7 @@ public class Bot extends Thread {
         // The server console will print out that the message was "expired". To avoid this, set timeStamp as now.
         long timeStamp = Instant.now().toEpochMilli();
 
-        //send command
+        // Send command
         if (text.startsWith("/")) {
             client.send(new ServerboundChatCommandPacket(
                     text.substring(1),
@@ -117,11 +119,10 @@ public class Bot extends Thread {
                     new ArrayList<>(),
                     true,
                     new ArrayList<>(),
-                    new LastSeenMessage(null, null)
+                    new LastSeenMessage(uuid, new byte[0])
             ));
         } else {
-            //send chat message
+            // Send chat message
-
             // From 1.19.1 or 1.19, the ServerboundChatPacket needs timestamp, salt and signed signature to generate packet.
             // tmpSignature will provide an empty byte array that can pretend it as signature.
             byte[] tmpSignature = new byte[0]; // Set it empty byte array.
@@ -132,12 +133,11 @@ public class Bot extends Thread {
                     new byte[0],
                     true,
                     new ArrayList<>(),
-                    new LastSeenMessage(null, null)));
+                    new LastSeenMessage(uuid, new byte[0])
+            ));
         }
-
     }
 
-
     public String getNickname() {
         return nickname;
     }