Hi Gonzalo, welcome to the forum!

I'm not sure what you mean. There is a jar in any Mango BACnet module in its lib directory. Perhaps you are asking about the releases here? https://github.com/infiniteautomation/BACnet4J/releases

No, there doesn't appear to be a jar file linked in that release, you would have to build it yourself. Our build system doesn't trigger BACnet4J builds automatically, but I just hit the build button on the current state of the repo: https://maven.mangoautomation.net/#browse/browse/assets:ias-snapshot:9238f1f3c81af9d8ce43f83c0a18ec70