wrong timestamp format
It sends timestamp without seconds, 2011-10-25T13:03Z for example, though they are required. http://xmpp.org/extensions/xep-0082.html#sect-id284095
It sends timestamp without seconds, 2011-10-25T13:03Z for example, though they are required. http://xmpp.org/extensions/xep-0082.html#sect-id284095