Version 2. working

app/src/main/java/com/example/ueberwachungssystem/Detection/DetectorService.java

     String wifiData;
     StringBuffer stringBufferWifi = new StringBuffer();
 
+    String typOfAlarm;
+
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
                 stringToStringbuffer(data);
                 Log.d("buffer",stringBufferWifi.toString());
                 passToServiceListener(stringBufferWifi);
+                checkState(data);
+                checkTyp(data);
 
             }
         });
             stringBufferWifi.append(string).append("\n");
         }
     }
+
+    public String[] splitString(String string){
+        String[] splitrxString = string.split(",");
+        return splitrxString; //splitrxString[0] = "1",splitrxString[1] = "HH:MM:SS", splitrxString[0].equals("1")
+
+    }
+
+    public boolean checkState(String string){
+        Log.d("state", String.valueOf(splitString(string)[4].equals("An")));
+        return splitString(string)[4].equals("An");
+    }
+
+    public String checkTyp(String string){
+        if (splitString(string)[5] != null) {
+            typOfAlarm = splitString(string)[5];
+            Log.d("Type",  typOfAlarm);
+        }
+        return typOfAlarm;
+    }
 }

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

     private final DatagramSocket socket;
     volatile private boolean running;
 
+    private boolean Gruppe =true;
+
     private OnConnectionListener listener;
     @SuppressLint("SetTextI18n")
     public WifiCommunication(int port) {
     }
 
     private class ReceiveThread extends Thread {
-        private StringBuffer rxStringBuffer = new StringBuffer();
         private String rxString="";
         private String previousRxString = "";
 
                     socket.receive(rxPacket);
                     rxString = new String(receiveData, 0, rxPacket.getLength());
                     String[] splitrxString = rxString.split(",");
-                    if(!previousRxString.equals(rxString) && splitrxString[0].equals("1") && splitrxString.length==7) {
-                        //rxStringBuffer.append(rxString).append("\n");
-                        Log.d("empfangen", rxString);
-                        sendWifiData(rxString);
-                        //mainActivity.runOnUiThread(() -> mainActivity.tvMessages.setText(rxStringBuffer));
-                        previousRxString = rxString;
+                    if(Gruppe){
+                        if(!previousRxString.equals(rxString) && splitrxString[0].equals("1") && splitrxString.length==7) {
+                            //rxStringBuffer.append(rxString).append("\n");
+                            Log.d("empfangen", rxString);
+                            sendWifiData(rxString);
+                            //mainActivity.runOnUiThread(() -> mainActivity.tvMessages.setText(rxStringBuffer));
+                            previousRxString = rxString;
+                        }
                     }
+
                 } while (running);
             }
             catch (IOException e) {