CEO, Tech IT Easy Lab of Pervasive VM Computing A Beginner’s Guide to XMPP

XMPP : what and why?  Existing Web Technologies have 2 broad categories  Pull (Example HTTP where connection is initiated by Client and initial communication is unidirectional (HTTP Request)  Push (Where communication is initiated by clients but connection is bi-directional, and keeps alive till disconnection or log-out )  Need and utility of (Server) Push: Real time Messaging (IM) like Google Talk, Facebook chat etc Delicate and urgent information like Stocks quotes that need be initiated to clients Real time Location tracking News feeds Cricket scores

XMPP a Push Protocol Extensible Messaging and Presence Protocol In G-talk you find if the other end is typing, entered message or her status like busy, idle, away etc

Jabber Jabber may refer to: The original name of the Extensible Messaging and Presence Protocol (XMPP), the open technology for instant messaging and presence.Extensible Messaging and Presence Protocol Jabber.org, the public, free instant messaging and presence service based on the XMPP protocol. Jabber.org Jabber XCP, a commercial product which is an implementation of the XMPP protocol. Acquired by Cisco Systems in 2008.Cisco Systems

Smack 1. Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. 2. A pure Java library 3. It can be embedded into your applications to create anything from a full XMPP client to simple XMPP integrations such as sending notification messages and presence-enabling devices. 4. We learn in next slides how to use Smack and make a simple Java application client for XMPP

Smack: Getting started 1. Pre-requites: a) Java SE 1.4 or above, SDK, language basics and concept b) An active Internet connection c) At least two Google accounts d) The Jabber Smack API Download SiteDownload Site 2. Step-1 a) Have the 2 jar files, i.Samck.jar ii.Smackx.jar that come with the API in your build path (CLASSPATH) a) We make sure that the two Google id can chat with each other, i.e. they are friend to each other b) We make sure we are connected to Internet

Smack Tutorials Some useful terms:  Roster  A list, especially of names : Dictionary meaning  While we chat we refer to our Friends in chat list as Roster Connect to an XMPP Server : default Port for XMPP (used by most of the providers) 2. We connect to talk.google.com with our google (gmail) id and password

Code Snippets to Connect XMPPConnection  The Java type that represents an XMPP connection It needs a ConnectionConfiguration object to set up The configuration object needs host, port and service name connection.connect() connects to the server & no authentication (login) done connection.login(user,password) succeeds on an Active Network if user and pasword are valid, else fails XMPPConnection  The Java type that represents an XMPP connection It needs a ConnectionConfiguration object to set up The configuration object needs host, port and service name connection.connect() connects to the server & no authentication (login) done connection.login(user,password) succeeds on an Active Network if user and pasword are valid, else fails

Connection set up continued… XMPP Server Port Number User IDPassword My password not shown here

Send a Text Message XMPPConnection Text Message Recipient ID Chat type message Add text Output console and browser notification

Listen For An Incoming Message Output

References You can study   