getting udp package info inside unity (GlovePIE)

I know there were a couple of posts about this in the past (the last one being in 2010), but they're all dead posts and noone is willing to answer anymore so I decided to try and bring up the topic again so I could get some help...

I'm currently trying to integrate a Wiimote (Wii remote) in a unity Standalone project. I first thought about using UniWii, but the thing is it doesn't support the Wii Motion Plus and I need it because of it's gyroscope functionality to rotate objects.

My second thought was using GlovePIE to interact with the remote and then sending the information to unity over OSC (like in this previous post "http://forum.unity3d.com/threads/21779-PPJoy-and-Unity") but again I bumped into a problem... I can't manage to get it woking with the example provided by "Raptor Claw" - the .zip file - at the bottom of the linked page...

I get the following error: "Assets/Plugins/UDPPacketIO.cs(2,17): error CS0234: The type or namespace name Ports' does not exist in the namespace System.IO'. Are you missing an assembly reference?"

Could someone help me out with that? Thanks in advance.