lakeshore 336: connecting with java +sockect

Hello
My org recently acquired a LKS 336 which has been connected and configured via Ethernet
I can easily connect to it with python, which proves that it is correctly configured

>>>from lakeshore import Model336
>>>my_instrument = Model336(ip_address=my_id)
>>> print(my_instrument.query("KRDG? 0"))
+00.0000,+00.0000,+00.0000,+00.0000

However, I am unable to connect using Java.
Is there any example available somewhere?
My code below. It connects but it does not read anything from the device:

DataOutputStream dout = null;
Socket s = null;
StringBuffer buffer = new StringBuffer();

try {
     s = new Socket(my_ip, 7777);
     DataInputStream din = new DataInputStream(s.getInputStream());
     dout = new DataOutputStream(s.getOutputStream());
     String comand = "KRDG? 0\n";
     byte[] a = comand.getBytes(StandardCharsets.UTF_8);
     dout.writeUTF(new String(a, StandardCharsets.UTF_8));
     dout.flush();
     while (din.available()>0) {
           System.out.println("Something available");
           buffer.append(din.readUTF());
     }

    System.out.println("Server says: " + buffer.toString());

} catch (Exception e) {
   System.out.println(e);
} finally {
   if (dout != null) {
       dout.close();
   }
   if (s != null) {
      s.close();
   }

 

Thanks