diff --git a/src/main/java/com/example/mina/box/lte3000/Lte3000VirtualBoxHandler.java b/src/main/java/com/example/mina/box/lte3000/Lte3000VirtualBoxHandler.java
index 09069c1..8d4a07e 100644
--- a/src/main/java/com/example/mina/box/lte3000/Lte3000VirtualBoxHandler.java
+++ b/src/main/java/com/example/mina/box/lte3000/Lte3000VirtualBoxHandler.java
@@ -2,7 +2,7 @@ package com.example.mina.box.lte3000;
 
 import com.example.mina.base.AbstractVirtualBoxHandler;
 import com.example.mina.entity.Lte3000DataBuffer;
-import com.example.mina.helper.Lte3000CommandHelper;
+import com.example.mina.util.Lte3000CommandHelper;
 import com.example.mina.util.CommandHelper;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.mina.core.session.IoSession;
@@ -54,16 +54,6 @@ public class Lte3000VirtualBoxHandler extends AbstractVirtualBoxHandler<Lte3000R
         return null;
     }
 
-    @Override
-    public void messageReceived(IoSession session, Object message) {
-
-        if (message instanceof Lte3000RequestMessage) {
-
-            Lte3000ResponseMessage responseMessage = handleMessage((Lte3000RequestMessage) message);
-            session.write(responseMessage);
-        }
-    }
-
 
 
     @Override
diff --git a/src/main/java/com/example/mina/helper/Lte3000CommandHelper.java b/src/main/java/com/example/mina/helper/Lte3000CommandHelper.java
deleted file mode 100644
index 7182f95..0000000
--- a/src/main/java/com/example/mina/helper/Lte3000CommandHelper.java
+++ /dev/null
@@ -1,180 +0,0 @@
-package com.example.mina.helper;
-
-import org.apache.commons.lang3.ArrayUtils;
-
-import java.nio.charset.StandardCharsets;
-
-public class Lte3000CommandHelper {
-
-//20-  21-! 22-" 23-# 24-$ 25-% 26-& 27-' 28-( 29-) 2a-* 2b-+ 2c-, 2d-- 2e-. 2f-/
-//30-0 31-1 32-2 33-3 34-4 35-5 36-6 37-7 38-8 39-9
-// 3a-: 3b-; 3c-< 3d-= 3e-> 3f-? 40-@
-// 41-A 42-B 43-C 44-D 45-E 46-F 47-G 48-H 49-I 4a-J 4b-K 4c-L 4d-M 4e-N 4f-O 50-P 51-Q 52-R 53-S 54-T 55-U 56-V 57-W 58-X 59-Y 5a-Z
-// 5b-[ 5c-\ 5d-] 5e-^ 5f-_ 60-`
-// 61-a 62-b 63-c 64-d 65-e 66-f 67-g 68-h 69-i 6a-j 6b-k 6c-l 6d-m 6e-n 6f-o 70-p 71-q 72-r 73-s 74-t 75-u 76-v 77-w 78-x 79-y 7a-z
-// 7b-{ 7c-| 7d-} 7e-~
-
-    ////def for Quinteck:
-//#define STX 0x02
-//#define ETX 0x03
-//#define ACK 0x06
-//#define NAK 0x15
-//#define RBM_ADDR_H 0x50
-//#define RBM_ADDR_L 0x00
-//#define NEXUS_ADDR_H 0x40
-//#define NEXUS_ADDR_L 0x00
-
-    public static final byte STX = 0X02;
-    public static final byte ETX = 0X03;
-    public static final byte ACK = 0X06;
-    public static final byte NAK = 0X15;
-
-    public static void main(String[] args) {
-        byte[] bs = Lte3000CommandHelper.genCommandGetCross(1);
-
-
-
-        System.exit(0);
-
-    }
-
-    public static void setCHK(byte[] bs) {
-        bs[bs.length - 1] = 0;
-
-        for (int i = 0; i < bs.length - 1; i++) {
-            bs[bs.length - 1] ^= bs[i];
-        }
-    }
-
-    public static int getBcdPort(byte a, byte b, byte c) {
-        //return (CommandHelper.BCD_REV[a] - 30) * 100 + (CommandHelper.BCD_REV[b] - 30) * 10 + (CommandHelper.BCD_REV[c] - 30);
-        return Integer.parseInt(new StringBuilder().append(a - 0x30).append(b - 0x30).append(c - 0x30).toString());
-    }
-
-    /**
-     * input: "-12.2"
-     * @param a sign
-     * @param b tenth
-     * @param c single
-     * @param d dot
-     * @param e tenths
-     * @return int -12 if -12.2
-     */
-    public static int getBcdAttn(byte a, byte b, byte c, byte d, byte e) {
-        String port = new StringBuilder()
-                //.append((char)a) // sign -/+
-                .append(b - 0x30).append(c - 0x30) // integer
-                //.append((char)d) // .
-                //.append(e - 0x30)
-                .toString(); // tenths.
-        return Integer.parseInt(port);
-    }
-
-    public static byte[] genCommandSetAttn(int col, int val){
-        byte[] command = new byte[18];
-        byte[] vCol = intToReversedBytes(col);
-        byte[] vVal = intToReversedBytes(val);
-        command[0] = STX;
-        command[1] = 0x30;
-        command[2] = 0x30;
-        command[3] = 'X';
-        command[4] = 'G';
-        command[5] = 'M';
-        command[6] = 'O';
-        command[7] = vCol.length > 2 ? vCol[2] : 0x30;
-        command[8] = vCol.length > 1 ? vCol[1] : 0x30;
-        command[9] = vCol.length > 0 ? vCol[0] : 0x30;
-        command[10] = '@';
-        command[11] = '-';
-        command[12] = vVal.length > 1 ? vVal[1] : 0x30;
-        command[13] = vVal.length > 0 ? vVal[0] : 0x30;
-        command[14] = '.';
-        command[15] = '0';
-        command[16] = ETX;
-        command[17] = 0;
-
-        setCHK(command);
-
-        return command;
-    }
-
-    public static byte[] genCommandGetAttn(int col){
-        byte[] command = new byte[12];
-        byte[] vCol = intToReversedBytes(col);
-        command[0] = STX;
-        command[1] = 0x30;
-        command[2] = 0x30;
-        command[3] = 'X';
-        command[4] = 'G';
-        command[5] = 'R';
-        command[6] = 'O';
-        command[7] = vCol.length > 2 ? vCol[2] : 0x30;
-        command[8] = vCol.length > 1 ? vCol[1] : 0x30;
-        command[9] = vCol.length > 0 ? vCol[0] : 0x30;
-        command[10] = ETX;
-        command[11] = 0;
-
-        setCHK(command);
-
-        return command;
-    }
-
-
-    public static byte[] genCommandSetCross(int row, int col){
-        byte[] command = new byte[12];
-        byte[] vRow = intToReversedBytes(row);
-        byte[] vCol = intToReversedBytes(col);
-        command[0] = STX;
-        command[1] = 0x30;
-        command[2] = 0x30;
-        command[3] = 'S';
-        command[4] = vCol.length > 2 ? vCol[2] : 0x30;
-        command[5] = vCol.length > 1 ? vCol[1] : 0x30;
-        command[6] = vCol.length > 0 ? vCol[0] : 0x30;
-        command[7] = vRow.length > 2 ? vRow[2] : 0x30;
-        command[8] = vRow.length > 1 ? vRow[1] : 0x30;
-        command[9] = vRow.length > 0 ? vRow[0] : 0x30;
-        command[10] = ETX;
-        command[11] = 0;
-
-        setCHK(command);
-
-        return command;
-    }
-
-    /**
-     * 1234 => "1234" => ['4','3','2','1']
-     * 1 => [31]
-     * 12 => [32,31]
-     * 123 => [33,32,31]
-     * @param value value to convert
-     * @return result
-     */
-    public static byte[] intToReversedBytes(int value) {
-        byte[] result = String.valueOf(value).getBytes(StandardCharsets.US_ASCII);
-        ArrayUtils.reverse(result);
-        return result;
-    }
-
-    public static byte[] genCommandGetCross(int col){
-        byte[] command = new byte[9];
-        byte[] value = String.valueOf(col).getBytes(StandardCharsets.US_ASCII);
-        ArrayUtils.reverse(value);
-        command[0] = STX;
-        command[1] = 0x30;
-        command[2] = 0x30;
-        command[3] = 'O';
-        command[4] = value.length >= 3 ? value[2] : 0x30;
-        command[5] = value.length >= 2 ? value[1] : 0x30;
-        command[6] = value.length >= 1 ? value[0] : 0x30;
-        command[7] = ETX;
-        command[8] = 0;
-
-        setCHK(command);
-
-        return command;
-    }
-
-
-
-}
\ No newline at end of file
diff --git a/src/main/java/com/example/mina/util/Lte3000CommandHelper.java b/src/main/java/com/example/mina/util/Lte3000CommandHelper.java
new file mode 100644
index 0000000..e17efcf
--- /dev/null
+++ b/src/main/java/com/example/mina/util/Lte3000CommandHelper.java
@@ -0,0 +1,172 @@
+package com.example.mina.util;
+
+import org.apache.commons.lang3.ArrayUtils;
+
+import java.nio.charset.StandardCharsets;
+
+public class Lte3000CommandHelper {
+
+//20-  21-! 22-" 23-# 24-$ 25-% 26-& 27-' 28-( 29-) 2a-* 2b-+ 2c-, 2d-- 2e-. 2f-/
+//30-0 31-1 32-2 33-3 34-4 35-5 36-6 37-7 38-8 39-9
+// 3a-: 3b-; 3c-< 3d-= 3e-> 3f-? 40-@
+// 41-A 42-B 43-C 44-D 45-E 46-F 47-G 48-H 49-I 4a-J 4b-K 4c-L 4d-M 4e-N 4f-O 50-P 51-Q 52-R 53-S 54-T 55-U 56-V 57-W 58-X 59-Y 5a-Z
+// 5b-[ 5c-\ 5d-] 5e-^ 5f-_ 60-`
+// 61-a 62-b 63-c 64-d 65-e 66-f 67-g 68-h 69-i 6a-j 6b-k 6c-l 6d-m 6e-n 6f-o 70-p 71-q 72-r 73-s 74-t 75-u 76-v 77-w 78-x 79-y 7a-z
+// 7b-{ 7c-| 7d-} 7e-~
+
+    ////def for Quinteck:
+//#define STX 0x02
+//#define ETX 0x03
+//#define ACK 0x06
+//#define NAK 0x15
+//#define RBM_ADDR_H 0x50
+//#define RBM_ADDR_L 0x00
+//#define NEXUS_ADDR_H 0x40
+//#define NEXUS_ADDR_L 0x00
+
+    public static final byte STX = 0X02;
+    public static final byte ETX = 0X03;
+    public static final byte ACK = 0X06;
+    public static final byte NAK = 0X15;
+    
+
+    public static void setCHK(byte[] bs) {
+        bs[bs.length - 1] = 0;
+
+        for (int i = 0; i < bs.length - 1; i++) {
+            bs[bs.length - 1] ^= bs[i];
+        }
+    }
+
+    public static int getBcdPort(byte a, byte b, byte c) {
+        //return (CommandHelper.BCD_REV[a] - 30) * 100 + (CommandHelper.BCD_REV[b] - 30) * 10 + (CommandHelper.BCD_REV[c] - 30);
+        return Integer.parseInt(new StringBuilder().append(a - 0x30).append(b - 0x30).append(c - 0x30).toString());
+    }
+
+    /**
+     * input: "-12.2"
+     * @param a sign
+     * @param b tenth
+     * @param c single
+     * @param d dot
+     * @param e tenths
+     * @return int -12 if -12.2
+     */
+    public static int getBcdAttn(byte a, byte b, byte c, byte d, byte e) {
+        String port = new StringBuilder()
+                //.append((char)a) // sign -/+
+                .append(b - 0x30).append(c - 0x30) // integer
+                //.append((char)d) // .
+                //.append(e - 0x30)
+                .toString(); // tenths.
+        return Integer.parseInt(port);
+    }
+
+    public static byte[] genCommandSetAttn(int col, int val){
+        byte[] command = new byte[18];
+        byte[] vCol = intToReversedBytes(col);
+        byte[] vVal = intToReversedBytes(val);
+        command[0] = STX;
+        command[1] = 0x30;
+        command[2] = 0x30;
+        command[3] = 'X';
+        command[4] = 'G';
+        command[5] = 'M';
+        command[6] = 'O';
+        command[7] = vCol.length > 2 ? vCol[2] : 0x30;
+        command[8] = vCol.length > 1 ? vCol[1] : 0x30;
+        command[9] = vCol.length > 0 ? vCol[0] : 0x30;
+        command[10] = '@';
+        command[11] = '-';
+        command[12] = vVal.length > 1 ? vVal[1] : 0x30;
+        command[13] = vVal.length > 0 ? vVal[0] : 0x30;
+        command[14] = '.';
+        command[15] = '0';
+        command[16] = ETX;
+        command[17] = 0;
+
+        setCHK(command);
+
+        return command;
+    }
+
+    public static byte[] genCommandGetAttn(int col){
+        byte[] command = new byte[12];
+        byte[] vCol = intToReversedBytes(col);
+        command[0] = STX;
+        command[1] = 0x30;
+        command[2] = 0x30;
+        command[3] = 'X';
+        command[4] = 'G';
+        command[5] = 'R';
+        command[6] = 'O';
+        command[7] = vCol.length > 2 ? vCol[2] : 0x30;
+        command[8] = vCol.length > 1 ? vCol[1] : 0x30;
+        command[9] = vCol.length > 0 ? vCol[0] : 0x30;
+        command[10] = ETX;
+        command[11] = 0;
+
+        setCHK(command);
+
+        return command;
+    }
+
+
+    public static byte[] genCommandSetCross(int row, int col){
+        byte[] command = new byte[12];
+        byte[] vRow = intToReversedBytes(row);
+        byte[] vCol = intToReversedBytes(col);
+        command[0] = STX;
+        command[1] = 0x30;
+        command[2] = 0x30;
+        command[3] = 'S';
+        command[4] = vCol.length > 2 ? vCol[2] : 0x30;
+        command[5] = vCol.length > 1 ? vCol[1] : 0x30;
+        command[6] = vCol.length > 0 ? vCol[0] : 0x30;
+        command[7] = vRow.length > 2 ? vRow[2] : 0x30;
+        command[8] = vRow.length > 1 ? vRow[1] : 0x30;
+        command[9] = vRow.length > 0 ? vRow[0] : 0x30;
+        command[10] = ETX;
+        command[11] = 0;
+
+        setCHK(command);
+
+        return command;
+    }
+
+    /**
+     * 1234 => "1234" => ['4','3','2','1']
+     * 1 => [31]
+     * 12 => [32,31]
+     * 123 => [33,32,31]
+     * @param value value to convert
+     * @return result
+     */
+    public static byte[] intToReversedBytes(int value) {
+        byte[] result = String.valueOf(value).getBytes(StandardCharsets.US_ASCII);
+        ArrayUtils.reverse(result);
+        return result;
+    }
+
+    public static byte[] genCommandGetCross(int col){
+        byte[] command = new byte[9];
+        byte[] value = String.valueOf(col).getBytes(StandardCharsets.US_ASCII);
+        ArrayUtils.reverse(value);
+        command[0] = STX;
+        command[1] = 0x30;
+        command[2] = 0x30;
+        command[3] = 'O';
+        command[4] = value.length >= 3 ? value[2] : 0x30;
+        command[5] = value.length >= 2 ? value[1] : 0x30;
+        command[6] = value.length >= 1 ? value[0] : 0x30;
+        command[7] = ETX;
+        command[8] = 0;
+
+        setCHK(command);
+
+        return command;
+    }
+
+
+
+}
\ No newline at end of file
--
libgit2 0.21.2