How to receive multiple responses from UDP broadcast

I have a case in which i need to send a broadcast a UDP request in the wifi on a specific port and the specific devices i am calling should return some info so i can determine how much are they in this network.
So far i have this:

public class UDP extends AsyncTask<Void, Void, String> {

@Override
protected String doInBackground(Void... voids) {
String text = "";
int server_port = 7432;
DatagramPacket receivePacket = null;
DatagramSocket clientSocket = null;
try {
clientSocket = new DatagramSocket();
clientSocket.setSoTimeout(5);
InetAddress IPAddress = InetAddress.getByName("255.255.255.255");
byte sendData = ("02904").getBytes();
byte receiveData = new byte[12];
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, server_port);
clientSocket.send(sendPacket);
receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
Log.e("Receiving response", "Response");
text = new String(receivePacket.getData());
clientSocket.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e) {
Log.e("Receiving response", "Response");
assert receivePacket != null;
text = new String(receivePacket.getData());
clientSocket.close();
} catch (IOException e) {
Log.e("Receiving response", "Response");
assert receivePacket != null;
text = new String(receivePacket.getData());
clientSocket.close();
}
return text;
}

@Override
protected void onPostExecute(String s) {
Log.e("Socket response", s);
}
}


Testing with 1 device in the network is returning weird triangles with question marks in them (i am not sure but i guess something with encoding) but my actual problem is that i do not know how to get a list for example and fill it up with all the devices that responded. How to get every response and save it as a different response so i can parse them?
Everything i know for the request is in the code. Response will be byte with 12 as size and device specific info in it.

byte

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