iNTERFACEWARE™ Inc.

Testing TCP/IP LLP Connections

It can often be useful to test LLP implementations using a low level tool to view the raw data being transmitted by an interface. An example of such a tool is called MSOCS (shown below).

MSOCS Test Program

MSOCS is a very simple tool to use and is useful for testing TCP/IP LLP Connections.

To use the MSOCS application:

• Check either the Client or Server radio button.
• Enter the port you are sending data to.

The receiving window will be populated with the output when a message is sent.

• Cut and paste that message into a text editor, such as Notepad, and save the file as a text ( .txt ) file.
• Open this file in Visual C++, or in any good hex editor that you prefer to use, making sure to do so in binary mode.

By examining the exact hexadecimal codes of the message, you can see exactly what is being sent. This is an excellent diagnostic tool for working out low level problems.

	An alternative tool to MSOCS that you may find useful is called Wireshark. Wireshark is a network protocol analyzer, used for a variety of purposes such as protocol analysis and network troubleshooting. It is useful for testing the structure of different network protocols like TCP/IP and can be run on a variety of platforms such as Windows, Linux and OS X.