Cannot get Python script to send command to network device

[cvdave 0]

Greetings all!

I am trying to help a friend get CinemaVision controlling a GlobalCache IP2IR device, using a Python script called from CinemaVision. I can execute the script directly (outside of CinemaVision), but I don't have any luck calling it from an action file. This appears to be a common problem, but I can't find any solutions. 

I have been able to call the Python script from the Kodi Callbacks add-on, so I think this rules out Kodi as the issue. 

This is the Action file:

python:///Users/me/Desktop/CVcontent/CinemaVision/Actions/irsend.py

This is the Python script:

from itachip2ir import VirtualDevice, iTach

commands = {
    "play_pause": "sendir,1:1,1,38109,1,1,341,85,22,4878",
    "play_pause_2": "sendir,1:2,1,38109,1,1,341,85,22,4878"
}

itach = iTach(ipaddress="127.0.0.1", port=4998)
posters = itach.add(VirtualDevice(
    name="posters", commands=commands))

if __name__ == "__main__":
	print(posters.play_pause())
	print(posters.play_pause_2())

I have also tried calling the Python script from a basic shell script:

#!/bin/sh 
python /Users/me/Desktop/CVcontent/CinemaVision/Actions/irsend.py

As well as using the command:// function to call Python directly:

command:///usr/bin/python /Users/me/Desktop/CVcontent/CinemaVision/Actions/irsend.py

I'm running Kodi 17.6 and CinemaVision 1.1.0 on OSX 10.13 High Sierra.

Any tips or troubleshooting advice would be appreciated!

Dave