Smack - A highly modular and portable open source XMPP client library written in Java for JVMs (JavaSE) and Android

Smack is an open source, highly modular, easy to use, XMPP client library written in Java for Java SE compatible JVMs and Android.A pure Java library, it can be embedded into your applications to create anything from a full XMPP instant messaging client to simple XMPP integrations such as sending notification messages and presence-enabling devices. Smack and XMPP allows you to easily exchange data, in various ways e.g. fire-and-forget, publish-subscribe, between human and non-human endpoints (M2M, IoT, …).