diff --git a/cim-client-sdk/cim-android-sdk/pom.xml b/cim-client-sdk/cim-android-sdk/pom.xml
index 92b5088..8a4da9e 100755
--- a/cim-client-sdk/cim-android-sdk/pom.xml
+++ b/cim-client-sdk/cim-android-sdk/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.farsunset</groupId>
     <artifactId>cim-android-sdk</artifactId>
-    <version>3.8.0</version>
+    <version>3.8.1</version>
     <packaging>jar</packaging>
 
     <properties>
@@ -14,7 +14,6 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
         <protobuf.lite.version>3.0.1</protobuf.lite.version>
-        <netty.version>4.1.44.Final</netty.version>
     </properties>
 
     <dependencies>
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java
index 9ae4681..4876a14 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMCacheManager.java
@@ -62,11 +62,13 @@ class CIMCacheManager {
     }
 
     public static String getString(Context context, String key) {
-        String value = null;
+        String value;
         ContentResolver resolver = context.getContentResolver();
         Cursor cursor = resolver.query(Uri.parse(String.format(CONTENT_URI, context.getPackageName())), new String[]{key}, null, null, null);
         if (cursor != null && cursor.moveToFirst()) {
             value = cursor.getString(0);
+        }else {
+            value = null;
         }
         closeQuietly(cursor);
         return value;
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectorManager.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectorManager.java
index d4df1ba..3214710 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectorManager.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMConnectorManager.java
@@ -173,10 +173,10 @@ class CIMConnectorManager {
     }
 
     public void sendHeartbeat() {
-        send(HeartbeatResponse.getInstance());
+        send(Pong.getInstance());
     }
 
-    public void send(final Protobufable body) {
+    public void send(final BinaryBody body) {
 
         if (!isConnected()) {
             return;
@@ -313,8 +313,8 @@ class CIMConnectorManager {
 
         LOGGER.messageReceived(socketChannel, message);
 
-        if (message instanceof HeartbeatRequest) {
-            send(HeartbeatResponse.getInstance());
+        if (message instanceof Ping) {
+            send(Pong.getInstance());
             return;
         }
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushManager.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushManager.java
index 561033e..04c8f08 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushManager.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushManager.java
@@ -56,6 +56,8 @@ public class CIMPushManager {
 
     protected static final String ACTION_HIDE_PERSIST_NOTIFICATION = "ACTION_HIDE_PERSIST_NOTIFICATION";
 
+    protected static final String ACTION_SEND_PONG = "ACTION_SEND_PONG";
+
     /**
      * 初始化,连接服务端，在程序启动页或者 在Application里调用
      */
@@ -117,6 +119,12 @@ public class CIMPushManager {
 
     }
 
+    public static void pong(Context context) {
+        Intent serviceIntent = new Intent(context, CIMPushService.class);
+        serviceIntent.setAction(ACTION_SEND_PONG);
+        startService(context, serviceIntent);
+    }
+
     private static void sendBindRequest(Context context, String account) {
 
         CIMCacheManager.putBoolean(context, CIMCacheManager.KEY_MANUAL_STOP, false);
@@ -256,7 +264,7 @@ public class CIMPushManager {
             return currDeviceId;
         }
 
-        String deviceId = UUID.randomUUID().toString().replaceAll("-", "").toUpperCase();
+        String deviceId = UUID.randomUUID().toString().replace("-", "").toUpperCase();
 
         CIMCacheManager.putString(context, CIMCacheManager.KEY_DEVICE_ID, deviceId);
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
index 696807d..599d305 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
@@ -34,6 +34,7 @@ import android.os.IBinder;
 import android.util.Log;
 import com.farsunset.cim.sdk.android.constant.CIMConstant;
 import com.farsunset.cim.sdk.android.logger.CIMLogger;
+import com.farsunset.cim.sdk.android.model.Pong;
 import com.farsunset.cim.sdk.android.model.SentBody;
 
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -146,6 +147,10 @@ public class CIMPushService extends Service {
             handleKeepAlive();
         }
 
+        if (CIMPushManager.ACTION_SEND_PONG.equals(action)) {
+            connectorManager.send(Pong.getInstance());
+        }
+
         if (CIMPushManager.ACTION_SET_LOGGER_EATABLE.equals(action)) {
             boolean enable = intent.getBooleanExtra(KEY_LOGGER_ENABLE, true);
             CIMLogger.getLogger().debugMode(enable);
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageDecoder.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageDecoder.java
index 8e18b7e..1977dc4 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageDecoder.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageDecoder.java
@@ -23,7 +23,7 @@ package com.farsunset.cim.sdk.android.coder;
 
 
 import com.farsunset.cim.sdk.android.constant.CIMConstant;
-import com.farsunset.cim.sdk.android.model.HeartbeatRequest;
+import com.farsunset.cim.sdk.android.model.Ping;
 import com.farsunset.cim.sdk.android.model.Message;
 import com.farsunset.cim.sdk.android.model.ReplyBody;
 import com.farsunset.cim.sdk.android.model.proto.MessageProto;
@@ -73,7 +73,7 @@ public class ClientMessageDecoder {
          消息读取完成后，通过type来解析成对应的消息体
          */
         if (CIMConstant.ProtobufType.S_H_RQ == type) {
-            return HeartbeatRequest.getInstance();
+            return Ping.getInstance();
         }
 
         if (CIMConstant.ProtobufType.REPLY_BODY == type) {
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageEncoder.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageEncoder.java
index fc0c6e6..7b95a1b 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageEncoder.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/coder/ClientMessageEncoder.java
@@ -22,14 +22,13 @@
 package com.farsunset.cim.sdk.android.coder;
 
 import com.farsunset.cim.sdk.android.constant.CIMConstant;
-import com.farsunset.cim.sdk.android.model.Protobufable;
-import com.farsunset.cim.sdk.android.model.SentBody;
+import com.farsunset.cim.sdk.android.model.BinaryBody;
 
 import java.nio.ByteBuffer;
 
 public class ClientMessageEncoder {
 
-    public ByteBuffer encode(Protobufable body) {
+    public ByteBuffer encode(BinaryBody body) {
 
         byte[] data = body.getByteArray();
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Protobufable.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/BinaryBody.java
similarity index 97%
rename from cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Protobufable.java
rename to cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/BinaryBody.java
index 81ac373..4e3eaa6 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Protobufable.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/BinaryBody.java
@@ -24,7 +24,7 @@ package com.farsunset.cim.sdk.android.model;
 /**
  * 需要向另一端发送的结构体
  */
-public interface Protobufable {
+public interface BinaryBody {
 
     byte[] getByteArray();
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/HeartbeatRequest.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Ping.java
similarity index 88%
rename from cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/HeartbeatRequest.java
rename to cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Ping.java
index 3a52724..7a25df6 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/HeartbeatRequest.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Ping.java
@@ -28,19 +28,19 @@ import java.io.Serializable;
 /**
  * 服务端心跳请求
  */
-public class HeartbeatRequest implements Serializable, Protobufable {
+public class Ping implements Serializable, BinaryBody {
 
     private static final long serialVersionUID = 1L;
     private static final String TAG = "SERVER_HEARTBEAT_REQUEST";
     private static final String CMD_HEARTBEAT_REQUEST = "SR";
 
-    private static final HeartbeatRequest object = new HeartbeatRequest();
+    private static final Ping object = new Ping();
 
-    private HeartbeatRequest() {
+    private Ping() {
 
     }
 
-    public static HeartbeatRequest getInstance() {
+    public static Ping getInstance() {
         return object;
     }
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/HeartbeatResponse.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Pong.java
similarity index 88%
rename from cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/HeartbeatResponse.java
rename to cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Pong.java
index 5c49100..96f7ca4 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/HeartbeatResponse.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/Pong.java
@@ -28,19 +28,19 @@ import java.io.Serializable;
 /**
  * 客户端心跳响应
  */
-public class HeartbeatResponse implements Serializable, Protobufable {
+public class Pong implements Serializable, BinaryBody {
 
     private static final long serialVersionUID = 1L;
     private static final String TAG = "CLIENT_HEARTBEAT_RESPONSE";
     private static final String CMD_HEARTBEAT_RESPONSE = "CR";
 
-    private static final HeartbeatResponse object = new HeartbeatResponse();
+    private static final Pong object = new Pong();
 
-    private HeartbeatResponse() {
+    private Pong() {
 
     }
 
-    public static HeartbeatResponse getInstance() {
+    public static Pong getInstance() {
         return object;
     }
 
diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/SentBody.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/SentBody.java
index 1ef7569..ce1f247 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/SentBody.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/model/SentBody.java
@@ -31,7 +31,7 @@ import java.util.Set;
 /**
  * java |android 客户端请求结构
  */
-public class SentBody implements Serializable, Protobufable {
+public class SentBody implements Serializable, BinaryBody {
 
     private static final long serialVersionUID = 1L;
 
diff --git a/doc/发送消息接口文档.doc b/doc/发送消息接口文档.doc
index 4f0f1d9..98207c8 100644
Binary files a/doc/发送消息接口文档.doc and b/doc/发送消息接口文档.doc differ