agent.setNominationStrategy(NominationStrategy.NOMINATE_HIGHEST_PRIO);
//stun and turn
if( sta.stunAddresses != null )
for( TransportAddress ta : sta.stunAddresses )
agent.addCandidateHarvester(new StunCandidateHarvester(ta) );
//LongTermCredential ltr = new LongTermCredential("1234", "abcd" ); //generateNonce(5), generateNonce(15));
if( sta.turnAddresses != null )
for( TransportAddress ta : sta.turnAddresses )
agent.addCandidateHarvester(new TurnCandidateHarvester(ta) );