diff --git a/.idea/modules.xml b/.idea/modules.xml
index e23fdf9..a822a05 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -2,8 +2,9 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/BTDemo.iml" filepath="$PROJECT_DIR$/BTDemo.iml" />
+      <module fileurl="file://D:\Project\ble-android-demo\BTDemo.iml" filepath="D:\Project\ble-android-demo\BTDemo.iml" />
       <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
+      <module fileurl="file://$PROJECT_DIR$/ble-android-demo.iml" filepath="$PROJECT_DIR$/ble-android-demo.iml" />
     </modules>
   </component>
 </project>
\ No newline at end of file
diff --git a/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt b/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt
index 89d28d7..f4fafd1 100644
--- a/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt
+++ b/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt
@@ -9,6 +9,7 @@ import android.os.Bundle
 import android.os.Handler
 import android.widget.Button
 import android.widget.EditText
+import kotlinx.android.synthetic.main.activity_main.*
 import xyz.mtfos.btdemo.objectTool.bind
 
 /**
@@ -37,6 +38,19 @@ class MainActivity : Activity() {
 
         ble?.setOnStateChangeListener {
             System.out.println("Now State is >>>> " + it)
+            if(it == PrinterBle.CONNECTING) {
+                disconnectBtn.isEnabled = true
+            }
+            if(it == PrinterBle.CONNECTED) {
+                btn.isEnabled = true
+                connectBtn.isEnabled = false
+                disconnectBtn.isEnabled = true
+            }
+            if(it == PrinterBle.DISCONNECTED) {
+                btn.isEnabled = false
+                connectBtn.isEnabled = true
+                disconnectBtn.isEnabled = false
+            }
         }
 
         var permissionCheck: Int = 0
@@ -50,7 +64,8 @@ class MainActivity : Activity() {
 
         btn.setOnClickListener {
             val txt: String = intxt.text.toString()
-
+            ble?.setAlign(PrinterBle.ALIGN_CENTER)?.addText(txt)
+    ble?.sendQueue()
         }
 
         connectBtn.setOnClickListener {
diff --git a/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java b/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java
index 1944086..76e3a0a 100644
--- a/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java
+++ b/app/src/main/java/xyz/mtfos/btdemo/PrinterBle.java
@@ -15,6 +15,7 @@ import android.bluetooth.le.ScanResult;
 import android.bluetooth.le.ScanSettings;
 import android.content.Context;
 import android.os.Build;
+import android.os.Handler;
 import android.os.ParcelUuid;
 import android.util.Log;
 
@@ -71,6 +72,8 @@ public class PrinterBle {
     private stateChangeListener mStateListener;
     private notifyListener mNotifyListener;
 
+    private Handler mHandler = new Handler();
+
     public interface stateChangeListener {
         void onChange(int state);
     }
@@ -96,7 +99,12 @@ public class PrinterBle {
                     mState = CONNECTED;
                     Log.d(TAG, "Connected");
                 }
-                mStateListener.onChange(mState);
+                mHandler.postDelayed(new Runnable() {
+                    @Override
+                    public void run() {
+                        mStateListener.onChange(mState);
+                    }
+                }, 100);
                 if(mState == CONNECTED) {
                     mBtGatt.discoverServices();
                 }
@@ -137,6 +145,7 @@ public class PrinterBle {
                     break;
             }
             sending = false;
+            runQueue();
         }
 
         @Override
@@ -283,7 +292,7 @@ public class PrinterBle {
         Log.d(TAG, String.format("setVal: %s / sendVal: %s", String.valueOf(setVal), String.valueOf(sendVal)));
     }
 
-    private void sendQueue() {
+    public void sendQueue() {
         if (sendingQueue == null) sendingQueue = new ArrayList<>();
         if (dataQueue == null) dataQueue = new ArrayList<>();
         if (dataQueue.size() == 0) return;
@@ -350,9 +359,10 @@ public class PrinterBle {
         addText("\n");
     }
 
-    public void addText(String txt) {
-        if (txt == null || txt.isEmpty()) return;
+    public PrinterBle addText(String txt) {
+        if (txt == null || txt.isEmpty()) return this;
         dataQueue.add(txt);
+        return this;
     }
 
     public void addTextln(String txt) {
@@ -360,7 +370,7 @@ public class PrinterBle {
         addText(txt + "\n");
     }
 
-    public void setAlign(int align) {
+    public PrinterBle setAlign(int align) {
         String strAlign = "";
         switch (align) {
             case ALIGN_CENTER:
@@ -371,9 +381,10 @@ public class PrinterBle {
             case ALIGN_RIGHT:
                 strAlign = "rt";
             default:
-                return;
+                return this;
         }
         addText("__a" + strAlign + "__");
+        return this;
     }
 
     public void setSize(int w, int h) {