Udp support for  2.x-maintenance

More: #9 
We're following Google Java code style: https://google-styleguide.googlecode.com/svn/trunk/javaguide.html#s7-javadoc, which prefers just a "basic form" of Javadocs, which includes only a rich summary sentence/paragraph. It allows "at-clauses", but explicit prohibits "at-clauses" with no descriptive text https://google-styleguide.googlecode.com/svn/trunk/javaguide.html#s7.1.3-javadoc-at-clauses