diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 3a6e55c..961163c 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -56,4 +56,5 @@ dependencies {
 
     implementation("androidx.activity:activity-ktx:1.13.0")
     implementation("androidx.navigation:navigation-compose:2.10.2")
+    implementation("com.google.code.gson:gson:2.15.0")
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/smart_watch_android/BLE/BleManager.kt b/app/src/main/java/com/example/smart_watch_android/BLE/BleManager.kt
index c55c542..2d6c0a9 100644
--- a/app/src/main/java/com/example/smart_watch_android/BLE/BleManager.kt
+++ b/app/src/main/java/com/example/smart_watch_android/BLE/BleManager.kt
@@ -65,6 +65,20 @@ object BLEManager{
                 updateConnectionStatus(true)
             }
         }
+
+        @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
+        override fun onCharacteristicWrite(gatt: BluetoothGatt?, characteristic: BluetoothGattCharacteristic?, status: Int) {
+            super.onCharacteristicWrite(gatt, characteristic, status)
+
+            if (status == BluetoothGatt.GATT_SUCCESS) {
+                Log.d("ESP32_BLE", "Write successful!")
+            } else {
+                Log.d("ESP32_BLE", "Write failed with status: $status")
+            }
+
+            isWriting = false
+            processNextWrite()
+        }
     }
     data class Devices(
         val deviceName: String,
@@ -141,40 +155,42 @@ object BLEManager{
             Log.d("BLE_DEBUG", "Permission BLUETOOTH_CONNECT error!")
         }
     }
+
     @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
     fun writeToEsp32(dataString: String?, SERVICE_UUID: UUID?, CHARACTERISTIC_UUID: UUID?) {
-        val gatt = bluetoothGatt
-        if (gatt == null) {
-            Log.d("ESP32_BLE", "Error: No GATT object existing (not connected).")
-            return
-        }
+        if (dataString == null || SERVICE_UUID == null || CHARACTERISTIC_UUID == null) return
 
-        if (dataString == null) {
-            Log.d("ESP32_BLE", "Error: Data string is null.")
-            return
-        }
+        val dataBytes = dataString.toByteArray(Charsets.UTF_8)
+        val request = WriteRequest(SERVICE_UUID, CHARACTERISTIC_UUID, dataBytes)
 
-        val service = gatt.getService(SERVICE_UUID)
-        if (service == null) {
-            Log.d("ESP32_BLE", "Error: Service UUID not found!")
-            return
-        }
+        // Auftrag zur Warteschlange hinzufügen
+        writeQueue.add(request)
 
-        val characteristic = service.getCharacteristic(CHARACTERISTIC_UUID)
-        if (characteristic == null) {
-            Log.d("ESP32_BLE", "Error: Characteristic UUID not found!")
-            return
-        }
+        // Versuchen, den nächsten Auftrag zu starten, falls gerade nichts läuft
+        processNextWrite()
+    }
+    @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
+    private fun processNextWrite() {
+        // Wenn bereits ein Schreibvorgang läuft oder die Queue leer ist, abbrechen
+        if (isWriting || writeQueue.isEmpty()) return
 
-        characteristic.value = dataString.toByteArray(Charsets.UTF_8)
+        val gatt = bluetoothGatt ?: return
 
+        // Nächsten Auftrag holen
+        val request = writeQueue.removeFirst()
+        val service = gatt.getService(request.serviceUuid) ?: return
+        val characteristic = service.getCharacteristic(request.characteristicUuid) ?: return
+
+        characteristic.value = request.data
         characteristic.writeType = BluetoothGattCharacteristic.WRITE_TYPE_NO_RESPONSE
 
+        isWriting = true // Sperren, bis der Callback kommt
         val success = gatt.writeCharacteristic(characteristic)
-        if (success) {
-            Log.d("ESP32_BLE", "Successfully started writing: $dataString")
-        } else {
-            Log.d("ESP32_BLE", "Failed to start writing (gatt busy or invalid state).")
+
+        if (!success) {
+            Log.d("ESP32_BLE", "Failed to start writing, resetting lock.")
+            isWriting = false
+            processNextWrite() // Beim nächsten versuchen
         }
     }
     @androidx.annotation.RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
diff --git a/app/src/main/java/com/example/smart_watch_android/MainActivity.kt b/app/src/main/java/com/example/smart_watch_android/MainActivity.kt
index 8784155..d6d4c10 100644
--- a/app/src/main/java/com/example/smart_watch_android/MainActivity.kt
+++ b/app/src/main/java/com/example/smart_watch_android/MainActivity.kt
@@ -2,8 +2,6 @@ package com.example.smart_watch_android
 
 import android.Manifest
 import android.bluetooth.BluetoothAdapter
-import android.content.BroadcastReceiver
-import android.content.Context
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
@@ -20,8 +18,7 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.ui.Modifier
 import com.example.smart_watch_android.BLE.BLEManager
-import com.example.smart_watch_android.BLE.DeviceUUIDs
-import com.example.smart_watch_android.Notification.MyNotificationListener
+import com.example.smart_watch_android.Notification.BlacklistManager
 import com.example.smart_watch_android.Screens.AppNavigation
 
 class MainActivity : ComponentActivity() {
@@ -38,6 +35,7 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?,) {
         super.onCreate(savedInstanceState)
         BLEManager.init(context = applicationContext, activity = this)
+        BlacklistManager.init(context = applicationContext)
         val adapter = BLEManager.bluetoothAdapter
         if (!adapter.isEnabled) {
             val enableBtIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
diff --git a/app/src/main/java/com/example/smart_watch_android/Notification/AppBlackList.kt b/app/src/main/java/com/example/smart_watch_android/Notification/AppBlackList.kt
index 275c963..55c37e0 100644
--- a/app/src/main/java/com/example/smart_watch_android/Notification/AppBlackList.kt
+++ b/app/src/main/java/com/example/smart_watch_android/Notification/AppBlackList.kt
@@ -1,4 +1,69 @@
 package com.example.smart_watch_android.Notification
 
-class AppBlackList {
+import android.content.Context
+import com.google.gson.Gson
+import com.google.firebase.crashlytics.buildtools.reloc.com.google.common.reflect.TypeToken
+import java.io.File
+
+object BlacklistManager {
+    private const val FILE_NAME = "blacklist.json"
+    private val blacklistCache = mutableSetOf<String>()
+    val AppCache = mutableSetOf<String>()
+    private var isInitialized = false
+
+    fun init(context: Context) {
+        if (isInitialized) return
+        val loadedList = loadStringList(context)
+        blacklistCache.clear()
+        blacklistCache.addAll(loadedList)
+        AppCache.addAll(loadedList)
+        isInitialized = true
+    }
+
+    fun isBlacklisted(packageName: String?): Boolean {
+        return blacklistCache.contains(packageName)
+    }
+
+    fun addBlackListPackage(context: Context, packageName: String) {
+        if (blacklistCache.add(packageName)) {
+            saveStringList(context)
+        }
+    }
+    fun removeBlackListPackage(context: Context, packageName: String) {
+        if (blacklistCache.remove(packageName)) {
+            saveStringList(context)
+        }
+    }
+    fun getAllBlacklisted(): Set<String> {
+        return blacklistCache
+    }
+
+    fun addAppPackage(packageName: String) {
+        AppCache.add(packageName)
+    }
+    fun removeAppPackage(packageName: String) {
+        AppCache.remove(packageName)
+    }
+
+    fun getAllApps(): Set<String> {
+        return AppCache
+    }
+
+    private fun saveStringList(context: Context) {
+        val jsonString = Gson().toJson(blacklistCache.toList())
+        File(context.filesDir, FILE_NAME).writeText(jsonString)
+    }
+
+    private fun loadStringList(context: Context): List<String> {
+        val file = File(context.filesDir, FILE_NAME)
+        if (!file.exists()) return emptyList()
+
+        return try {
+            val jsonString = file.readText()
+            val type = object : TypeToken<List<String>>() {}.type
+            Gson().fromJson(jsonString, type) ?: emptyList()
+        } catch (e: Exception) {
+            emptyList()
+        }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/smart_watch_android/Notification/NotificationLisener.kt b/app/src/main/java/com/example/smart_watch_android/Notification/NotificationLisener.kt
index 8a0a449..43b061f 100644
--- a/app/src/main/java/com/example/smart_watch_android/Notification/NotificationLisener.kt
+++ b/app/src/main/java/com/example/smart_watch_android/Notification/NotificationLisener.kt
@@ -1,7 +1,6 @@
 package com.example.smart_watch_android.Notification
 
 import android.Manifest
-import android.content.Intent
 import android.service.notification.StatusBarNotification
 import android.util.Log
 import android.service.notification.NotificationListenerService
@@ -19,9 +18,11 @@ class MyNotificationListener : NotificationListenerService() {
         val text = extras?.getString("android.text")
 
         Log.d("NotificationListener", "App: $packageName | Title: $title | Text: $text")
-        BLEManager.writeToEsp32(dataString = packageName, SERVICE_UUID = DeviceUUIDs.SERVICE_NOTIFICATION_UUID, CHARACTERISTIC_UUID = DeviceUUIDs.CHAR_NOTIF_APP_UUID)
-        BLEManager.writeToEsp32(dataString = title, SERVICE_UUID = DeviceUUIDs.SERVICE_NOTIFICATION_UUID, CHARACTERISTIC_UUID = DeviceUUIDs.CHAR_NOTIF_TITLE_UUID)
-        BLEManager.writeToEsp32(dataString = text, SERVICE_UUID = DeviceUUIDs.SERVICE_NOTIFICATION_UUID, CHARACTERISTIC_UUID = DeviceUUIDs.CHAR_NOTIF_TEXT_UUID)
+        if (!BlacklistManager.isBlacklisted(packageName)){
+            BLEManager.writeToEsp32(dataString = packageName, SERVICE_UUID = DeviceUUIDs.SERVICE_NOTIFICATION_UUID, CHARACTERISTIC_UUID = DeviceUUIDs.CHAR_NOTIF_APP_UUID)
+            BLEManager.writeToEsp32(dataString = title, SERVICE_UUID = DeviceUUIDs.SERVICE_NOTIFICATION_UUID, CHARACTERISTIC_UUID = DeviceUUIDs.CHAR_NOTIF_TITLE_UUID)
+            BLEManager.writeToEsp32(dataString = text, SERVICE_UUID = DeviceUUIDs.SERVICE_NOTIFICATION_UUID, CHARACTERISTIC_UUID = DeviceUUIDs.CHAR_NOTIF_TEXT_UUID)
+        }
 
 
     }
diff --git a/app/src/main/java/com/example/smart_watch_android/Screens/AppNavigation.kt b/app/src/main/java/com/example/smart_watch_android/Screens/AppNavigation.kt
index 407f07b..b876a66 100644
--- a/app/src/main/java/com/example/smart_watch_android/Screens/AppNavigation.kt
+++ b/app/src/main/java/com/example/smart_watch_android/Screens/AppNavigation.kt
@@ -21,6 +21,12 @@ fun AppNavigation(viewModel: MainViewModel) {
     val context = LocalContext.current
     val isConnected by BLEManager.isConnected.collectAsState()
     val navController = rememberNavController()
+    enum class enumScreens {
+        control_panel,
+        connect,
+        black_list
+    }
+    lateinit var Screens: enumScreens
     LaunchedEffect(BLEManager.isConnected) {
         if (isConnected) {
             navController.navigate("control_panel") {
@@ -54,10 +60,14 @@ fun AppNavigation(viewModel: MainViewModel) {
                     BLEManager.disconnectEsp32(context = context)
                 },
                 onNotificationListnerClicked = {
-                    val intent = Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS)
-                    context.startActivity(intent)
+                    //val intent = Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS)
+                    //context.startActivity(intent)#
+                    navController.navigate("black_list")
                 }
             )
         }
+        composable("black_list") {
+            BlacklistScreen()
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/smart_watch_android/Screens/BlackListConfig.kt b/app/src/main/java/com/example/smart_watch_android/Screens/BlackListConfig.kt
index 6a2299c..f7e003e 100644
--- a/app/src/main/java/com/example/smart_watch_android/Screens/BlackListConfig.kt
+++ b/app/src/main/java/com/example/smart_watch_android/Screens/BlackListConfig.kt
@@ -1,4 +1,89 @@
 package com.example.smart_watch_android.Screens
 
-class BlackListConfig {
-}
\ No newline at end of file
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.smart_watch_android.Notification.BlacklistManager
+
+@Composable
+fun BlacklistScreen() {
+    val context = LocalContext.current
+
+    Surface(
+        modifier = Modifier.fillMaxSize(),
+        color = MaterialTheme.colorScheme.background
+    ) {
+        LazyColumn(
+            modifier = Modifier.fillMaxSize(),
+            contentPadding = PaddingValues(16.dp),
+            verticalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+                items(BlacklistManager.AppCache.count()) {
+                    BlacklistManager.AppCache.forEach { app ->
+                        AppRowItem(app)
+                }
+            }
+        }
+    }
+}
+@Composable
+fun AppRowItem(app: String) {
+    var checked = true
+    val context = LocalContext.current
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp)
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(12.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.SpaceBetween
+        ) {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                modifier = Modifier.weight(1f)
+            ) {
+                Column {
+                    Text(
+                        text = app,
+                        style = MaterialTheme.typography.bodyLarge
+                    )
+                    Text(
+                        text = app,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+            }
+            if (BlacklistManager.isBlacklisted(app)){
+                checked = true
+            }
+
+            Switch(
+                checked = checked,
+                onCheckedChange = {
+                    BlacklistManager.addBlackListPackage(context , app)
+                }
+            )
+        }
+    }
+}
diff --git a/app/src/main/java/com/example/smart_watch_android/Screens/ConnectScreen.kt b/app/src/main/java/com/example/smart_watch_android/Screens/ConnectScreen.kt
index c808351..7c1db4a 100644
--- a/app/src/main/java/com/example/smart_watch_android/Screens/ConnectScreen.kt
+++ b/app/src/main/java/com/example/smart_watch_android/Screens/ConnectScreen.kt
@@ -107,5 +107,17 @@ fun ConnectScreen(viewModel: MainViewModel) {
                 fontSize = 32.sp
             )
         }
+
+        Spacer(modifier = Modifier.height(64.dp))
+
+        Button(
+            modifier = Modifier.fillMaxWidth(),
+            onClick = { BLEManager.updateConnectionStatus(true)}
+        ) {
+            Text(
+                text = "fake connect",
+                fontSize = 32.sp
+            )
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/smart_watch_android/Screens/ControlPanelScreen.kt b/app/src/main/java/com/example/smart_watch_android/Screens/ControlPanelScreen.kt
index 485d73e..c2f229b 100644
--- a/app/src/main/java/com/example/smart_watch_android/Screens/ControlPanelScreen.kt
+++ b/app/src/main/java/com/example/smart_watch_android/Screens/ControlPanelScreen.kt
@@ -29,7 +29,7 @@ import com.example.smart_watch_android.MainViewModel
 fun ControlPanelScreen(
     viewModel: MainViewModel,
     onDisconnectClicked: () -> Unit,
-    onNotificationListnerClicked: () -> Unit
+    onNotificationListnerClicked: @Composable () -> Unit
 ) {
     val context = LocalContext.current
     var textInput by remember { mutableStateOf("") }
@@ -98,7 +98,7 @@ fun ControlPanelScreen(
             colors = ButtonDefaults.buttonColors(containerColor = Color(0xFFE53935)),
             modifier = Modifier.fillMaxWidth()
         ) {
-            Text("Notification Listener")
+            Text("App BlackList")
         }
     }
 }
\ No newline at end of file