There are add-on packages for Python available to interface with matlab. I have not installed or tested any of these myself but hope to do so in the future. Vizard 4 uses Python 2.7 so the add-on must be compatible with 2.7. Here a few libraries you can look into:
Pymatbridge -
http://arokem.github.io/python-matlab-bridge/
mlabwrap -
http://mlabwrap.sourceforge.net/
pymatlab -
https://pypi.python.org/pypi/pymatlab
Can you describe the kind of data you're looking to send over and why the networking method is not meeting your needs?