diff --git a/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java b/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java
index ac9ccf4..b835c67 100644
--- a/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java
+++ b/android-example/app/src/main/java/net/irext/ircontrol/ui/fragment/ControlFragment.java
@@ -65,6 +65,15 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
     private Socket emitterConn = null;
     private int emitterConnected = 0;
 
+    private static final String A_REQUEST_HELLO = "a_hello";
+    private static final String E_RESPONSE_HELLO = "e_hello";
+
+    private static final String A_REQUEST_BIN = "a_bin";
+    private static final String E_RESPONSE_BIN = "e_bin";
+
+    private static final String A_REQUEST_CTRL = "a_control";
+    private static final String E_RESPONSE_CTRL = "e_control";
+
     private MsgHandler mHandler;
 
     private ControlActivity mParent;
@@ -74,7 +83,7 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
     // define the single instance of IRDecode
     private IRDecode mIRDecode;
 
-    private CheckBox mCbUseEmitter;
+    private CheckBox mCbDecodeOnBoard;
     private EditText mEtEmitterIp;
     private ImageButton mBtnConnect;
     private TextView mTvConnectionStatus;
@@ -116,7 +125,7 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
         btnPlus.setOnClickListener(this);
         btnMinus.setOnClickListener(this);
 
-        mCbUseEmitter = view.findViewById(R.id.cb_use_emitter);
+        mCbDecodeOnBoard = view.findViewById(R.id.cb_use_encoded);
         mEtEmitterIp = view.findViewById(R.id.emitter_ip);
         mBtnConnect = view.findViewById(R.id.btn_connect_emitter);
         mTvConnectionStatus = view.findViewById(R.id.tv_connection_status);
@@ -246,6 +255,7 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
             mTvConnectionStatus.setText(mParent.getString(R.string.status_connected));
             mTvConnectionStatus.setTextColor(Color.parseColor("#7F7FFF"));
         });
+        sendHelloToEmitter();
     }
     private void onEmitterDisconnected() {
         if (1 == emitterConnected) {
@@ -268,10 +278,41 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
         emitterConnected = 0;
     }
 
-    private void onEmitterResponse(String line) {
-        Log.d(TAG, "emitter: " + line);
+    private void processEHello(String response) {
+
     }
 
+    private void processEBin(String response) {
+
+    }
+
+    private void processECtrl(String response) {
+
+    }
+
+    private void onEmitterResponse(String response) {
+        Log.d(TAG, "emitter: " + response);
+        if (response.startsWith(E_RESPONSE_HELLO)) {
+            processEHello(response);
+        } else if (response.startsWith(E_RESPONSE_BIN)) {
+            processEBin(response);
+        } else if (response.startsWith(E_RESPONSE_CTRL)) {
+            processECtrl(response);
+        } else {
+            Log.e(TAG, "unexpected response : " + response);
+        }
+    }
+
+    private void sendHelloToEmitter() {
+        new Thread(() -> {
+            try {
+                PrintWriter out = new PrintWriter(emitterConn.getOutputStream(), true);
+                out.println(A_REQUEST_HELLO);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }).start();
+    }
     private void sendDecodedToEmitter(String value) {
         new Thread(() -> {
             try {
@@ -294,9 +335,9 @@ public class ControlFragment extends Fragment implements View.OnClickListener {
                     emitterConn.setKeepAlive(true);
                     onEmitterConnected();
                     BufferedReader in = new BufferedReader(new InputStreamReader(emitterConn.getInputStream()));
-                    String line;
-                    while ((line = in.readLine()) != null) {
-                        onEmitterResponse(line);
+                    String response = "";
+                    while ((response = in.readLine()) != null) {
+                        onEmitterResponse(response);
                     }
                     onEmitterDisconnected();
                 } catch (IOException ioException) {
diff --git a/android-example/app/src/main/res/layout/fragment_control.xml b/android-example/app/src/main/res/layout/fragment_control.xml
index bfa9dd4..055f0ba 100644
--- a/android-example/app/src/main/res/layout/fragment_control.xml
+++ b/android-example/app/src/main/res/layout/fragment_control.xml
@@ -236,12 +236,12 @@
                 android:layout_height="wrap_content"
                 android:orientation="horizontal">
             <CheckBox
-                    android:id="@+id/cb_use_emitter"
+                    android:id="@+id/cb_use_encoded"
                     android:layout_width="match_parent"
                     android:layout_height="60dp"
                     android:textSize="18sp"
                     android:layout_marginStart="20dp"
-                    android:text="@string/use_emitter"
+                    android:text="@string/decode_on_board"
                     android:layout_weight="1"
                     android:checked="false"/>
             <TextView
diff --git a/android-example/app/src/main/res/mipmap-xxhdpi/button_link.png b/android-example/app/src/main/res/mipmap-xxhdpi/button_link.png
index 6881384..cb6b4fa 100644
Binary files a/android-example/app/src/main/res/mipmap-xxhdpi/button_link.png and b/android-example/app/src/main/res/mipmap-xxhdpi/button_link.png differ
diff --git a/android-example/app/src/main/res/mipmap-xxhdpi/button_unlink.png b/android-example/app/src/main/res/mipmap-xxhdpi/button_unlink.png
index 4b249d2..80bc5f7 100644
Binary files a/android-example/app/src/main/res/mipmap-xxhdpi/button_unlink.png and b/android-example/app/src/main/res/mipmap-xxhdpi/button_unlink.png differ
diff --git a/android-example/app/src/main/res/values-zh-rCN/strings.xml b/android-example/app/src/main/res/values-zh-rCN/strings.xml
index 62947c6..8bef3c6 100644
--- a/android-example/app/src/main/res/values-zh-rCN/strings.xml
+++ b/android-example/app/src/main/res/values-zh-rCN/strings.xml
@@ -35,7 +35,7 @@
     <string name="emitter_ip">发射端 IP</string>
     <string name="default_ip">192.168.2.85</string>
     <string name="connect">连接</string>
-    <string name="use_emitter">使用发射器</string>
+    <string name="decode_on_board">在单片机上解码</string>
     <string name="input_emitter_ip_address">请输入接收器的 IP 地址</string>
     <string name="connect_failed">连接失败</string>
     <string name="connect_disconnected">连接已断开</string>
diff --git a/android-example/app/src/main/res/values/strings.xml b/android-example/app/src/main/res/values/strings.xml
index 5933e21..6fe61a5 100644
--- a/android-example/app/src/main/res/values/strings.xml
+++ b/android-example/app/src/main/res/values/strings.xml
@@ -35,7 +35,7 @@
     <string name="emitter_ip">Emitter IP</string>
     <string name="default_ip">192.168.2.85</string>
     <string name="connect">connect</string>
-    <string name="use_emitter">Use Emitter</string>
+    <string name="decode_on_board">Decode On Board</string>
     <string name="input_emitter_ip_address">Please input IP address of emitter</string>
     <string name="connect_failed">Connect failed</string>
     <string name="connect_disconnected">The connection has lost</string>