Can't hear the audio rtp streaming [closed]

edit

Hi, I am trying to get the streaming audio from my robot's mic to my tablet so i used the ffmpeg to create the stream :

ffmpeg -f alsa -i hw:0  -acodec libmp3lame -f rtp rtp://224.1.2.4:7001/test.ffm

The streaming is working perfectly between the robot and and my computer in the same lan , so i tried this code to get the audio streaming working on tablet but i hear nothing coming out from the tablet . note that 192.168.1.120 is my tablet's ip .

 try {
                    audioGroup = new AudioGroup();
                    audioGroup.setMode(AudioGroup.MODE_NORMAL);
                    audioStream = new AudioStream(InetAddress.getByAddress(new byte[] {(byte)192, (byte)168, (byte)1, (byte)120 }));
                    audioStream.setCodec(AudioCodec.PCMU);
                    audioStream.setMode(RtpStream.MODE_NORMAL);
                    audioStream.associate(InetAddress.getByAddress(new byte[] {(byte)224, (byte)1, (byte)2, (byte)4 }), 7001);
                   audioStream.join(audioGroup);
                   AudioManager Audio =  (AudioManager) getSystemService(Context.AUDIO_SERVICE);
                    Audio.setMode(AudioManager.MODE_IN_COMMUNICATION);
                }
                catch (SocketException e) { e.printStackTrace();}
                catch (UnknownHostException e) { e.printStackTrace();}
                catch (Exception ex) { ex.printStackTrace();}}

From my android's studio monitor i can see that the app is not receiving any rtp packages but it is sending packages to 224.1.2.4. Please i need to know what's the problem and how to fix it .