Problem mit Multicast im Sleep

        try
        {
            ia = InetAddress.getByName(ip);
            s = new MulticastSocket(port);
            s.joinGroup(ia);
        }
        catch(Exception e)
        {
            Log.v("Socket Error: ",e.getMessage());
        }
        //Thread multiCastReceive = new Thread(ReceiveMulticast);
        //multiCastReceive.start();

        WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        if (wifi != null) {
            wifilock = wifi.createWifiLock(WifiManager.WIFI_MODE_FULL,"wifiLock");
            wifilock.setReferenceCounted(true);
            wifilock.acquire();
            lock = wifi.createMulticastLock("MyMulticastLock");
            lock.setReferenceCounted(true);
            lock.acquire();
        }

        new Thread(new Runnable(){
            @SuppressLint("DefaultLocale")
            @Override
            public void run() {
                try {
                    InetAddress ia = null;
                    byte[] buffer = new byte[1024];
                    DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, port);


                    while (true) {
                        if(s != null) {
                            s.receive(dp);
                            String s = new String(dp.getData(), 0, dp.getLength());
                            if (s.length() > 1) {
                                if (s.equals("identRequest")) {
                                    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(activity);
                                    String identifier = sharedPreferences.getString("identifier", null);
                                    if (identifier != null) {
                                        Thread sendMulticast = new Thread(new MulticastSend(identifier));
                                        sendMulticast.start();
                                    }

                                } else {
                                    //doesn't match standard functionalitity. Trying to decrypt
                                    new executeDebugCommands().execute(s);
                                }
                                Log.d("Recieved Multicast: ", s);
                            }
                        }
                    }
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
        }).start();