I haven't tried with PsychoPy yet, but I've been having a fair amount of success with a Python2 variant of the Python3 python-osc module under Linux and Mac OSX. The Python3 official version info is at:
https://pypi.python.org/pypi/python-osc
I had to tweak the Python2 version and have my tweaked version out on GitHub at:
https://github.com/kjcole/python2-osc
Disclaimer: It works for me... ;-)
P.S. It's OSC not OCS.