To get traffic data, it has to be uploaded from ATC, and nobody in Europe has bought the extra software/equipment to do that. They all could (as they have in the USA) but they have decided to not spend the money.
So NO traffic data via Mode S in Europe, now, or ever.
As regards emitting ADS-B data, I don't know what exactly is involved but an obvious pre-requisite would be a GPS-transponder connection carrying the NMEA data. That is trivial, but "illegal".
I don't know what extra config there is in a GTX330. I have the Installation Manual and you can find it on the internet easily enough.