diff --git a/inos/Smart-Watch/Smart-Watch.ino b/inos/Smart-Watch/Smart-Watch.ino
index 6daa77f..70e5399 100644
--- a/inos/Smart-Watch/Smart-Watch.ino
+++ b/inos/Smart-Watch/Smart-Watch.ino
@@ -42,6 +42,16 @@ class CharacteristicCallbacks: public BLECharacteristicCallbacks {
       }
     }
 };
+class MyServerCallbacks: public BLEServerCallbacks {
+    void onConnect(BLEServer* pServer) {
+      Serial.println("Conecction with client");
+      BLEDevice::startAdvertising();
+    };
+
+    void onDisconnect(BLEServer* pServer) {
+      Serial.println("Disconnection with client");
+    }
+};
 
 void setup() {
   Serial.begin(115200);
@@ -88,8 +98,14 @@ void loop() {
 void initDevice(){
   BLEDevice::init(deviceName);
   BLEServer *pServer = BLEDevice::createServer();
+  pServer->setCallbacks(new MyServerCallbacks());
   BLEService *pService = pServer->createService(SERVICE_UUID);
 
+  BLESecurity *pSecurity = new BLESecurity();
+  pSecurity->setAuthenticationMode(ESP_LE_AUTH_BOND); // Bonding erlauben
+  pSecurity->setCapability(ESP_IO_CAP_NONE);
+  pSecurity->setInitEncryptionKey(ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK);
+
   //Test characteristic
   BLECharacteristic *pCharacteristic = pService->createCharacteristic(
     CHAR_TEST_UUID, 
@@ -112,7 +128,6 @@ void initDevice(){
   BLEDevice::startAdvertising();
   Serial.println("Characteristic defined! Now you can read it in your phone!");
 }
-
 void updateClock(){
   unsigned long curMil = millis();