diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/connection/MiraiUDPClient.java b/mirai-core/src/main/java/net/mamoe/mirai/network/connection/MiraiUDPClient.java
index 1ad518c5d..869215b2e 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/network/connection/MiraiUDPClient.java
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/connection/MiraiUDPClient.java
@@ -23,6 +23,8 @@ public class MiraiUDPClient {
         ));
         this.listener.startup();
     }
+
+
 }
 
 
diff --git a/mirai-core/src/test/java/HexComparator.java b/mirai-core/src/test/java/HexComparator.java
index 7f447bddd..c80ed383b 100644
--- a/mirai-core/src/test/java/HexComparator.java
+++ b/mirai-core/src/test/java/HexComparator.java
@@ -6,8 +6,13 @@ import net.mamoe.mirai.network.Protocol;
 
 import java.lang.reflect.Field;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.LongAdder;
+import java.util.function.BiConsumer;
 
 /**
  * This could be used to check packet encoding..
@@ -29,6 +34,10 @@ public class HexComparator {
 
     private static final String BLUE = "\033[34m";
 
+    public static final List<HexReader> consts  = new LinkedList<>(){{
+        add(new HexReader("90 5E 39 DF 00 02 76 E4 B8 DD 00"));
+    }};
+
     private static class ConstMatcher {
         private static final List<Field> CONST_FIELDS = new LinkedList<>() {{
             List.of(Protocol.class).forEach(aClass -> Arrays.stream(aClass.getDeclaredFields()).peek(this::add).forEach(Field::trySetAccessible));
@@ -151,6 +160,9 @@ public class HexComparator {
             if (isDif) {
                 ++dif;
             }
+
+            //doConstReplacement(hex1b);
+            //doConstReplacement(hex2b);
         }
 
         return (builder.append(" ").append(dif).append(" 个不同").append("\n")
@@ -158,8 +170,38 @@ public class HexComparator {
                 .append(hex1b).append("\n")
                 .append(hex2b))
                 .toString();
+
+
     }
 
+
+    private static void doConstReplacement(StringBuilder builder){
+        String mirror = builder.toString();
+        HexReader hexs = new HexReader(mirror);
+        for (AtomicInteger i=new AtomicInteger(0);i.get()<builder.length();i.addAndGet(1)){
+            hexs.setTo(i.get());
+            consts.forEach(a -> {
+                hexs.setTo(i.get());
+                List<Integer> posToPlaceColor = new LinkedList<>();
+                AtomicBoolean is = new AtomicBoolean(false);
+
+                a.readFully((c,d) -> {
+                    if(c.equals(hexs.readHex())){
+                        posToPlaceColor.add(d);
+                    }else{
+                        is.set(false);
+                    }
+                });
+
+                if(is.get()){
+                    AtomicInteger adder = new AtomicInteger();
+                    posToPlaceColor.forEach(e -> {
+                        builder.insert(e + adder.getAndAdd(BLUE.length()),BLUE);
+                    });
+                }
+            });
+        }
+    }
     private static String getNumber(int number) {
         if (number < 10) {
             return "00" + number;
@@ -171,6 +213,7 @@ public class HexComparator {
     }
 
     public static void main(String[] args) {
+        /*
         System.out.println(HexComparator.compare(
                 //mirai
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
@@ -178,6 +221,7 @@ public class HexComparator {
                 //e
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
         ));
+        */
 
         System.out.println(HexComparator.compare(
                 //e
@@ -186,4 +230,66 @@ public class HexComparator {
                 "6F 0B DF 92 00 02 76 E4 B8 DD 00 00 04 53 00 00 00 01 00 00 15 85 00 00 01 55 35 05 8E C9 BA 16 D0 01 63 5B 59 4B 59 52 31 01 B9 00 00 00 00 00 00 00 00 00 00 00 00 00 E9 E9 E9 E9 00 00 00 00 00 00 00 00 00 10 15 74 C4 89 85 7A 19 F5 5E A9 C9 A3 5E 8A 5A 9B AA BB CC DD EE FF AA BB CC\n\n\n"
         ));
     }
+
+
 }
+
+class HexReader{
+    private String s;
+    private int pos = 0;
+    private int lastHaxPos = 0;
+
+
+    public HexReader(String s){
+        this.s = s;
+    }
+
+    public String readHex(){
+        boolean isStr = false;
+        String next = "";
+        for (;pos<s.length()-2;++pos){
+
+            char s1 = ' ';
+            if(pos != 0){
+                s1 = this.s.charAt(0);
+            }
+            char s2 = this.s.charAt(pos+1);
+            char s3 = this.s.charAt(pos+2);
+            char s4 = ' ';
+            if(this.s.length() != (this.pos+3)){
+                s4 = this.s.charAt(pos+3);
+            }
+            if(
+                    Character.isSpaceChar(s1) && Character.isSpaceChar(s4)
+                    &&
+                            (Character.isDigit(s2) || Character.isAlphabetic(s2))
+                            &&
+                            (Character.isDigit(s3) || Character.isAlphabetic(s3))
+            ){
+                this.pos+=2;
+                this.lastHaxPos = this.pos+1;
+                return String.valueOf(s2) + String.valueOf(s3);
+            }
+        }
+        return "";
+    }
+
+    public void readFully(BiConsumer<String, Integer> processor){
+        this.reset();
+        String nextHax = this.readHex();
+        while (!nextHax.equals(" ")){
+            processor.accept(nextHax,this.lastHaxPos);
+            nextHax = this.readHex();
+        }
+    }
+
+    public void setTo(int pos){
+        this.pos = pos;
+    }
+
+    public void reset(){
+        this.pos = 0;
+    }
+
+}
+