How to debug TCP connection between MATLAB and C++?

Hi,

I have a MATLAB script that communicates via pnet mex file with an executable built via C++ using winsock library. The C++ executable streams data off of a device and then transmits that data into MATLAB via TCP. Every so often, MATLAB hangs or crashes during communication. I'd like to find out why this is happening and fix the problem but I'm not sure how to go about debugging a process in which a MATLAB script is calling on multiple executables of multiple languages (MATLAB and C++) that are working together simultaneously.

How would you suggest I go about debugging this entire communication process?

Thank you!

Answer 1

[Walter Roberson]

You should get tcpdump or equivalent program.

[David]

Hi Walter, thank you for your response. I installed tcpdump, got it up and running, but when I'm running the MATLAB/C++ process I mentioned and run tcpdump simultaneously (pointing to the correct port) I get no captured packets (only filtered packets). Any ideas?

[Walter Roberson]

You may need to have elevated permissions to capture the packets.

In Unix-type systems tcpdump is only able to capture packets for processes with the same EUID (owner) as the person running tcpdump, unless the person running tcpdump has complete network access rights (such as sudo)

In MS Windows, I do not know what the access restrictions are.