The above definition uses a OSC receiver node from the rugOSC plugin for Grasshopper. This plug in should work for both PC and Mac. Make sure you have your firewall turned off specifically for Rhino and Grasshopper so you can receive messages from the network.
To install the plugin make sure the downloaded files are unblocked then copy the dll and gha file under
~\AppData\Roaming\Grasshopper\Libraries and restart Rhino/Grasshopper.
The rug OSC receives unformatted OSC so there is a bit of work that needs to be done to format the data. You can download the above example definition here: rugOSC_example