ESC POS commands via socket to ethernet interface

Hello,

I am struggling to successfully send ESC POS commands to a printer connected on my local network via ethernet interface (I can ping the printer).

Simply trying to print a text, as a starting point:

String host = "192.168.1.100";

Socket socket = new Socket(host, 9100);

OutputStream socketOutputStream = socket.getOutputStream();

socketOutputStream.write("Hello World !!!".getBytes("iso-8859-1"));

socketOutputStream.flush();

socketOutputStream.close();

socket.close();

Not luck with this...

However if I change the write line to cut paper instead:

socketOutputStream.write(new byte[]{GS, 0x56, 0x00});

it works!

Same for Line Feed:

socketOutputStream.write(new byte[]{0x0A});

this works to!

This tell me that the TCP communication is actually working ... but something is not correct when I try to print a text.

I tried different things like writing one or more escape characters (0x1B) and a line feed after, but no success.

I found (and used) sequences of commands that I found on this post:

http://ift.tt/1vez7En

which supposedly should be working via serial, but it didn't not work for me via socket.

Anybody has experience with this?

I would appreciate any help!