diff --git a/app/build.gradle b/app/build.gradle
index eac470b..af555d2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -8,8 +8,8 @@ android {
         applicationId "io.github.chronosx88.yggdrasil"
         minSdkVersion 21
         targetSdkVersion 29
-        versionCode 2
-        versionName "1.2"
+        versionCode 3
+        versionName "1.3"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         project.ext.set("archivesBaseName", project.getParent().name+"-"+versionName)
     }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index ee57592..18c1ee0 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -16,11 +16,13 @@
             tools:ignore="GoogleAppIndexingWarning">
         <activity
                 android:name=".PeerListActivity"
+                android:parentActivityName=".MainActivity"
                 android:label="@string/title_activity_peer_list"
                 android:theme="@style/AppTheme.NoActionBar"
                 android:screenOrientation="portrait"/>
         <activity
                 android:name=".DNSListActivity"
+                android:parentActivityName=".MainActivity"
                 android:label="@string/title_activity_dns_list"
                 android:theme="@style/AppTheme.NoActionBar"
                 android:screenOrientation="portrait"/>
diff --git a/app/src/main/java/io/github/chronosx88/yggdrasil/MainActivity.kt b/app/src/main/java/io/github/chronosx88/yggdrasil/MainActivity.kt
index e525341..839faef 100644
--- a/app/src/main/java/io/github/chronosx88/yggdrasil/MainActivity.kt
+++ b/app/src/main/java/io/github/chronosx88/yggdrasil/MainActivity.kt
@@ -100,7 +100,9 @@ class MainActivity : AppCompatActivity() {
         currentPeers = deserializeStringSet2PeerInfoSet(preferences.getStringSet(CURRENT_PEERS, HashSet())!!)
         val adapter = PeerInfoListAdapter(this, currentPeers.sortedWith(compareBy { it.ping }))
         peersListView.adapter = adapter
-
+        if(isStarted && this.currentPeers.isEmpty()) {
+            updatePeers()
+        }
         val copyAddressButton = findViewById<Button>(R.id.copyIp)
         copyAddressButton.setOnClickListener {
             val ip = findViewById<TextView>(R.id.ip)
@@ -185,6 +187,18 @@ class MainActivity : AppCompatActivity() {
         startService(intent)
     }
 
+    private fun checkPeers(){
+        //this is Mesh mode, send Peers update every 5 sec
+        thread(start = true) {
+            while(true) {
+                Thread.sleep(5000)
+                if(isStarted && this.currentPeers.isEmpty()) {
+                    updatePeers()
+                }
+            }
+        }
+    }
+
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
 
@@ -251,15 +265,7 @@ class MainActivity : AppCompatActivity() {
             STATUS_START -> {
                 print("service started")
                 if(this.currentPeers.isEmpty()){
-                    //this is Mesh mode, send Peers update every 5 sec
-                    thread(start = true) {
-                        while(true) {
-                            Thread.sleep(5000)
-                            if(isStarted && this.currentPeers.isEmpty()) {
-                                updatePeers()
-                            }
-                        }
-                    }
+                    checkPeers()
                 }
             }
             STATUS_FINISH -> {
diff --git a/app/src/main/java/io/github/chronosx88/yggdrasil/YggdrasilTunService.kt b/app/src/main/java/io/github/chronosx88/yggdrasil/YggdrasilTunService.kt
index 96e95ad..b0e593a 100644
--- a/app/src/main/java/io/github/chronosx88/yggdrasil/YggdrasilTunService.kt
+++ b/app/src/main/java/io/github/chronosx88/yggdrasil/YggdrasilTunService.kt
@@ -1,9 +1,6 @@
 package io.github.chronosx88.yggdrasil
 
-import android.app.Notification
-import android.app.NotificationChannel
-import android.app.NotificationManager
-import android.app.PendingIntent
+import android.app.*
 import android.content.Context
 import android.content.Intent
 import android.net.ConnectivityManager
@@ -292,8 +289,13 @@ class YggdrasilTunService : VpnService() {
                 // https://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#NotificationCompat.Builder(android.content.Context)
                 ""
             }
+        var intent = Intent(this, MainActivity::class.java)
+        var stackBuilder = TaskStackBuilder.create(this)
+        stackBuilder.addNextIntentWithParentStack(intent)
+        var pi = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT)
         val b = NotificationCompat.Builder(this, channelId)
         b.setOngoing(true)
+            .setContentIntent(pi)
             .setContentTitle(getString(R.string.app_name))
             .setContentText(text)
             .setSmallIcon(R.mipmap.ic_launcher)
diff --git a/app/src/main/res/layout/new_dns_dialog.xml b/app/src/main/res/layout/new_dns_dialog.xml
index 3223ec4..464b9f4 100644
--- a/app/src/main/res/layout/new_dns_dialog.xml
+++ b/app/src/main/res/layout/new_dns_dialog.xml
@@ -21,7 +21,7 @@
                 android:id="@+id/ipInput"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
-                android:digits="0,1,2,3,4,5,6,7,8,9,:"
+                android:digits="0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,:"
                 android:hint="IPv6"
                 android:inputType="textNoSuggestions"
                 android:textColor="@color/white"
diff --git a/build.gradle b/build.gradle
index ec73f9e..8c88b8c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.0'
+        classpath 'com.android.tools.build:gradle:4.0.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files