Disclaimer: I'm the author of the parent link in question (though I didn't submit it).

I started with https://github.com/Sensebloom/OSCeleton to connect to Processing, I modified one of these examples: https://github.com/Sensebloom/OSCeleton-examples and it worked well. Couldn't see how to connect to OSC to Scratch, so I modified the OSC example to send Scratch variable updates. I can email you Processing code if you pm me an email.