Got it. I believe the problem is links… the PLM monitoring mode only works if you have a link to the device in the PLM.
Do me a favor, go into the web interface and add the EZIO2X4 in the device section (this will automatically create a link between the two) and then try again.
You can of course create links via the API, but this will be the easiest way first to make sure you can receive the broadcast changes.
Make sure you have the latest binary installed (1.53).