Kommunikation Version 1 UDP Socket

app/src/main/java/com/example/ueberwachungssystem/MainActivity.java

@@ -31,7 +31,7 @@ public class MainActivity extends AppCompatActivity {
 
     boolean sending = false;
 
-    String message;
+    String message = "";
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {