Java socket read inputstream without blocking

I have a little problem with implementing socket connection between Android and IOS. While I'm using my application to connect two Android running devices everything works fine. But when I have to receive some data from Iphone app my readStream function is blocking and I can receive all data after the other part close the socket and it that way I can't return any response back to it. Here is what I am using for listening :

try {
    serverSocket = new ServerSocket(5000);
    Log.d("","CREATE SERVER SOCKET");
} catch (IOException e) {
     e.printStackTrace();
}

while(state){
    try {
        if(serverSocket!=null){
            client = serverSocket.accept();
            client.setKeepAlive(true);
            client.setSoTimeout(10000);

            // LOGS
            Log.w("READ","is connected : "+client.isConnected());
            Log.w("READ","port : "+client.getPort());
            Log.w("READ","ipadress : "+client.getInetAddress().toString());



            InputStream is = client.getInputStream();

            Log.w("READ","is Size : "+is.available());

            byte[] bytes = DNSUtils.readBytes(is);
            Log.v("","-------------------------");
            for(int i=0;i<bytes.length;i++){
                Log.w("READ","bytes["+i+"] : "+bytes[i]);
            }
            Log.v("","-------------------------");

            try {
                Log.w("READ","packetType : "+bytes[4]);

                if(bytes!=null)
                    DNSUtils.getPacketType(bytes[4], bytes, client);

            } catch(Exception e){
                e.printStackTrace();
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
        Log.v("","IOException");
        ResponseERR pack = new ResponseERR();
        ResponseERR.errorMsg = "Socket TimeOut exception!";
        byte[] packet = pack.createNewPacket();

        try {
            if(client!=null){
                OutputStream out = client.getOutputStream();
                out.write(packet);
                out.flush();
                client.shutdownOutput();
                client.close();
                Log.e("READDATAFROMSOCKET","ResponseERR Send.");
            }
        } catch (Exception e1) {
            e1.printStackTrace();
        }
    }
}

and here is the function which I am using to convert InputStream to Byte Array :

public static byte[] readBytes(InputStream inputStream) throws IOException {
    // this dynamically extends to take the bytes you read
    ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();

    // this is storage overwritten on each iteration with bytes
    int bufferSize = 1024;
    byte[] buffer = new byte[bufferSize];

    // we need to know how may bytes were read to write them to the byteBuffer
    int len = 0;
    while ((len = inputStream.read(buffer)) != -1) {
        byteBuffer.write(buffer, 0, len);
    }

    // and then we can return your byte array.
    return byteBuffer.toByteArray();
}

The both Iphone / Android app works like this:

• First it creates Socket and send data to other device and close the OutputStream.
• The second part is parsing the byte array and then return response using the same socket.

Any ideas how to change my functions so I can read the inputstream without blocking?

EDIT:

So the problem was on IOS side, it seems that Apple API require to close both streams of the created socket : read/write so the byte array can be send, which seems really stupid, because in that way the iphone app can't receive and parse my response.