diff --git a/src/main/java/com/casic/common/CasicFrame.java b/src/main/java/com/casic/common/CasicFrame.java
index 2175800..2b4613f 100644
--- a/src/main/java/com/casic/common/CasicFrame.java
+++ b/src/main/java/com/casic/common/CasicFrame.java
@@ -20,7 +20,22 @@
     JSONObject messageBody;
 
     public String getDevTypeName() {
-        return "";
+        switch (getDeviceType()) {
+            case "21":
+                return "MonitorPipe";
+
+            case "31":
+                return "Methane";
+
+            case "32":
+                return "LG";
+
+            case "34":
+                return "Tube";
+
+            default:
+                return "";
+        }
     }
 
     public void parseMessageBody() {

diff --git a/src/main/java/com/casic/common/CasicFrame.java b/src/main/java/com/casic/common/CasicFrame.java
index 2175800..2b4613f 100644
--- a/src/main/java/com/casic/common/CasicFrame.java
+++ b/src/main/java/com/casic/common/CasicFrame.java
@@ -20,7 +20,22 @@
     JSONObject messageBody;
 
     public String getDevTypeName() {
-        return "";
+        switch (getDeviceType()) {
+            case "21":
+                return "MonitorPipe";
+
+            case "31":
+                return "Methane";
+
+            case "32":
+                return "LG";
+
+            case "34":
+                return "Tube";
+
+            default:
+                return "";
+        }
     }
 
     public void parseMessageBody() {
diff --git a/src/main/java/com/casic/common/general/IMEIFrame.java b/src/main/java/com/casic/common/general/IMEIFrame.java
index fb1b962..356feda 100644
--- a/src/main/java/com/casic/common/general/IMEIFrame.java
+++ b/src/main/java/com/casic/common/general/IMEIFrame.java
@@ -1,8 +1,11 @@
 package com.casic.common.general;
 
+import com.alibaba.fastjson.JSONObject;
 import com.casic.common.CasicFrame;
 import lombok.Data;
-import lombok.extern.slf4j.Slf4j;
+
+import java.time.LocalDateTime;
+import java.time.ZoneId;
 
 @Data
 public class IMEIFrame extends CasicFrame {
@@ -26,6 +29,24 @@
     }
 
     @Override
+    public JSONObject toJSON() {
+        JSONObject obj = new JSONObject();
+
+        obj.put("mType", MESSAGE_TYPE_STRING);
+        obj.put("devType", getDevTypeName());
+        obj.put("devCode", getDeviceCode());
+
+        JSONObject body = new JSONObject();
+        body.put("bType", getDevTypeName() + "Data");
+        body.put("imei", imei);
+        body.put("iccid", iccid);
+
+        obj.put("mBody", body);
+        obj.put("ts", LocalDateTime.now().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());
+        return obj;
+    }
+
+    @Override
     public void parseMessageBody() {
         imei = getMessageBody().getString("IMEI");
         iccid = getMessageBody().getString("ICCID");