Smack 4.2.4 已发布，Smack 是一个开源，易于使用的 XMPP(jabber) 的 Java 客户端类库，Smack 的 patchlevel 版本与 API 兼容。
Bug
[SMACK-804] - ServiceAdministrationManager does not use correct form actions
[SMACK-805] - ServiceDiscoveryManager.findService() only considers the first service by feature
[SMACK-813] - Smack uses hostname instead of XMPP service name for SNI
新功能
[SMACK-794] - Add support for XEP-0394: Message Markup
[SMACK-795] - Add support for XEP-0382: Spoiler messages
[SMACK-799] - Add support for XEP-0372: References
[SMACK-800] - Add support for XEP-0392: Consistent Color Generation
改进
[SMACK-802] - Rename and deprecate: addPacketSendingListener(), removePacketSendingListener(), addPacketInterceptor() and removePacketInterceptor()
[SMACK-809] - Make Roster's non-roster presence map second-level map bounded
完整内容请查看发布日志。
引用来自“大洋的顶端”的评论
XMPP 主要在于传输量过大，比起JSON、protobuf、mqtt等等来说，劣势太多了迟早淘汰也是正常的。
迟早淘汰也是正常的。