java.lang.RuntimeException: Too much loops to produce handshake packets
at DTLSOverDatagram.handshake(DTLSOverDatagram.java:153)
at DTLSOverDatagram.doServerSide(DTLSOverDatagram.java:94)
at DTLSOverDatagram$ServerCallable.call(DTLSOverDatagram.java:515)
at DTLSOverDatagram$ServerCallable.call(DTLSOverDatagram.java:505)
at java.util.concurrent.FutureTask.run(FutureTask.java:265)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
java.lang.Exception: Not ready for application data yet
at DTLSOverDatagram.handshake(DTLSOverDatagram.java:225)
at DTLSOverDatagram.doClientSide(DTLSOverDatagram.java:116)
at DTLSOverDatagram$ClientCallable.call(DTLSOverDatagram.java:549)
at DTLSOverDatagram$ClientCallable.call(DTLSOverDatagram.java:539)
at java.util.concurrent.FutureTask.run(FutureTask.java:265)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Maybe too many UDP packet loss?