diff --git a/BHDXJ/app/src/main/AndroidManifest.xml b/BHDXJ/app/src/main/AndroidManifest.xml
index 057f7ca..39181f9 100755
--- a/BHDXJ/app/src/main/AndroidManifest.xml
+++ b/BHDXJ/app/src/main/AndroidManifest.xml
@@ -232,6 +232,7 @@
 
         <service
             android:name=".bleUtil.BluetoothLeService"
+            android:exported="false"
             android:enabled="true" />
 
         <provider
diff --git a/BHDXJ/app/src/main/java/com/rehome/bhdxj/bleUtil/BluetoothLeService.java b/BHDXJ/app/src/main/java/com/rehome/bhdxj/bleUtil/BluetoothLeService.java
index 258fec4..2e7e8d8 100644
--- a/BHDXJ/app/src/main/java/com/rehome/bhdxj/bleUtil/BluetoothLeService.java
+++ b/BHDXJ/app/src/main/java/com/rehome/bhdxj/bleUtil/BluetoothLeService.java
@@ -1,6 +1,7 @@
 package com.rehome.bhdxj.bleUtil;
 
 
+import android.Manifest;
 import android.app.Service;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
@@ -12,10 +13,13 @@ import android.bluetooth.BluetoothManager;
 import android.bluetooth.BluetoothProfile;
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.os.Binder;
 import android.os.IBinder;
 import android.util.Log;
 
+import androidx.core.app.ActivityCompat;
+
 import java.util.List;
 import java.util.UUID;
 
@@ -59,6 +63,16 @@ public class BluetoothLeService extends Service {
                 broadcastUpdate(intentAction);
                 Log.i(TAG, "Connected to GATT server.");
                 // Attempts to discover services after successful connection.
+                if (ActivityCompat.checkSelfPermission(BluetoothLeService.this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+                    // TODO: Consider calling
+                    //    ActivityCompat#requestPermissions
+                    // here to request the missing permissions, and then overriding
+                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
+                    //                                          int[] grantResults)
+                    // to handle the case where the user grants the permission. See the documentation
+                    // for ActivityCompat#requestPermissions for more details.
+                    return;
+                }
                 Log.i(TAG, "Attempting to start service discovery:" +
                         mBluetoothGatt.discoverServices());
 
@@ -185,6 +199,16 @@ public class BluetoothLeService extends Service {
         // Previously connected device.  Try to reconnect.
         if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)&& mBluetoothGatt != null) {
             Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
+            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+                // TODO: Consider calling
+                //    ActivityCompat#requestPermissions
+                // here to request the missing permissions, and then overriding
+                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
+                //                                          int[] grantResults)
+                // to handle the case where the user grants the permission. See the documentation
+                // for ActivityCompat#requestPermissions for more details.
+                return false;
+            }
             if (mBluetoothGatt.connect()) {
                 mConnectionState = STATE_CONNECTING;
                 return true;
@@ -218,6 +242,16 @@ public class BluetoothLeService extends Service {
             Log.w(TAG, "BluetoothAdapter not initialized");
             return;
         }
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+            // TODO: Consider calling
+            //    ActivityCompat#requestPermissions
+            // here to request the missing permissions, and then overriding
+            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
+            //                                          int[] grantResults)
+            // to handle the case where the user grants the permission. See the documentation
+            // for ActivityCompat#requestPermissions for more details.
+            return;
+        }
         mBluetoothGatt.disconnect();
     }
 
@@ -229,6 +263,16 @@ public class BluetoothLeService extends Service {
         if (mBluetoothGatt == null) {
             return;
         }
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+            // TODO: Consider calling
+            //    ActivityCompat#requestPermissions
+            // here to request the missing permissions, and then overriding
+            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
+            //                                          int[] grantResults)
+            // to handle the case where the user grants the permission. See the documentation
+            // for ActivityCompat#requestPermissions for more details.
+            return;
+        }
         mBluetoothGatt.close();
         mBluetoothGatt = null;
     }
@@ -245,6 +289,16 @@ public class BluetoothLeService extends Service {
             Log.w(TAG, "BluetoothAdapter not initialized");
             return;
         }
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+            // TODO: Consider calling
+            //    ActivityCompat#requestPermissions
+            // here to request the missing permissions, and then overriding
+            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
+            //                                          int[] grantResults)
+            // to handle the case where the user grants the permission. See the documentation
+            // for ActivityCompat#requestPermissions for more details.
+            return;
+        }
         mBluetoothGatt.readCharacteristic(characteristic);
     }
     public void writeCharacteristic(BluetoothGattCharacteristic characteristic) {
@@ -252,6 +306,16 @@ public class BluetoothLeService extends Service {
             Log.w(TAG, "BluetoothAdapter not initialized");
             return;
         }
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+            // TODO: Consider calling
+            //    ActivityCompat#requestPermissions
+            // here to request the missing permissions, and then overriding
+            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
+            //                                          int[] grantResults)
+            // to handle the case where the user grants the permission. See the documentation
+            // for ActivityCompat#requestPermissions for more details.
+            return;
+        }
         mBluetoothGatt.writeCharacteristic(characteristic);
     }
     /**
@@ -266,6 +330,16 @@ public class BluetoothLeService extends Service {
             Log.w(TAG, "BluetoothAdapter not initialized");
             return;
         }
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+            // TODO: Consider calling
+            //    ActivityCompat#requestPermissions
+            // here to request the missing permissions, and then overriding
+            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
+            //                                          int[] grantResults)
+            // to handle the case where the user grants the permission. See the documentation
+            // for ActivityCompat#requestPermissions for more details.
+            return;
+        }
         mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
     }