} else {
System.out.println("offline " + pa);
}
FutureResponse fr2 = peer.pingRPC().pingUDP(pa, cc, new DefaultConnectionConfiguration());
fr2.awaitUninterruptibly();
cc.shutdown().awaitUninterruptibly();
if (fr2.isSuccess()) {
System.out.println("peer online UDP:" + pa);
} else {
System.out.println("offline " + pa);
}