XMPP - Distributed Communication
Notifications, updates, and aggregation in realtime.
Anders Conbere
XMPP?
extensible MESSAGING and PRESENCE protocol
Open
Standard
Standard
RFC 3920 and RFC 3921
Defined by the IETF as RFC 3920 and RFC 3921
Distributed
Like email servers, xmpp servers will route and send messages to other servers.
How Does It Work?
Client Auth
TCP Connection
XML Stream
XML Stanzas
Message
<message from='juliet@example.com'
to='romeo@example.net'
xml:lang='en'>
<body>Art thou not Romeo, and a Montague?</body>
</message>
Presence
Not away messages
Info/Query: Iq
<iq from='juliet@example.com/balcony' type='get' id='roster_1'>
<query xmlns='jabber:iq:roster'/>
</iq>
Who's using it?
Google uses xmpp to power GTalk.
Twitters sports IM integration on their server which allows users to post to their twitter feed via XMPP messages, but to also receive notification when changes occur to their tweets list.
Tivo has begun to use xmpp to send updates to television schedules to it's set-top boxes.
Similar to twitter jaiku users can update their streams via xmpp.
What tools does XMPP bring us?
Rosters
Rosters
Store relationships between clients
Rosters
Directional arcs between nodes
Rosters
<iq to='juliet@example.com/balcony' type='result' id='roster_1'>
<query xmlns='jabber:iq:roster'>
<item jid='romeo@example.net'
name='Romeo'
subscription='both'>
<group>Friends</group>
</item>
<item jid='mercutio@example.org'
name='Mercutio'
subscription='from'>
<group>Friends</group>
</item>
<item jid='benvolio@example.org'
name='Benvolio'
subscription='both'>
<group>Friends</group>
</item>
</query>
Rosters
Groups / Communities
Rosters
Vcard / User Profile
PubSub
PubSub
Publish Subscribe - a multi-client push model
Presence
Presence
if user.status == "online":
send(message)
else:
wait(10)
Presence
anywhere anytime
Getting Started