Moved from Programming Question since you don't show any code and your question is quite generic. I don't even know what is ANT+, which is a name probably difficult to search.
If you want only answers from people knowing what it is, that's OK.
Otherwise, perhaps you can provide a link? (for lazy (read: busy) people like me)

Ok, you're right, excuse me for my missing.
So ANT+ is a field sensors protocol developed in an open source reality and implemented in sport/healt world.
Sending a simple query to Google we get this: https://www.google.it/search?q=ant%2B&ie=utf-8
and the official site for this technology is http://www.thisisant.com/

I would to implement an ANT+ client in Processing using if possibile a "pre-cooked" library.
I searched on internet by a java library (to adapt in Processing) but with no great results.
Could someone help me?



@PhiLho, please could you move back to give more visibility to this post so someone can help me? Thanks.