XMPP Made Simple : Roster and Presence Explained.

XMPP

In a previous tutorial, we did our best to explain the basic concepts of XMPP in layman terms. We touched on the architectural and addressing aspects of the protocol and looked at its building blocks. In this tutorial we are moving one step up and looking at how XMPP manages contact lists and how it lets us advertise online status (online|offline) to our contacts. We will also explore how we can impose restrictions on who can see your online status. Lets get started shall we?

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