Yes, you should have an events folder in your addon, and there a .h file that contains a listener, a manager and perhaps another class for the parameters of the event.
The listener is the class you inherit to be able to receive the events from your app.
The manager implements the addListener, removeListener and notify methods that manage all the poco related stuff. You can have different methods for this: don't remember the tuio events but can be something like:
Then for your addon I suppose you will only need to register listeners to one instance (there are no separate controls to which you need to register listeners independently) so you can create a global instance of the manager, that should be called something like ofxTuioEvents so you can register listeners by calling
Take a look at ofMouseEvents.h, I think is the most similar to what you need
If you have any problems just post when you have something done, and i'll try to help.