Here it is: https://github.com/FirstCypress/LiV/tree/S_development/software/liv

The code you are interested in resides under livXMPP directory.

It implements a XMPP agent that does this:

http://www.livpi.com/liv-pi-instant-messaging.html

LiV XMPP agent is part of this project:

http://www.livpi.com

Here is a brief software architecture description:

http://liv-pi-forum.1124721.n5.nabble.com/LiV-a-brief-software-guide-f67.html 

You would need to spend some time to figure out how you can modify the existing code to fit your needs.

Good luck,

Alfred

Just in case this is too complex for your needs, here are a few basic examples: http://xmpppy.sourceforge.net, you can go over them first and then you can decide if you want to take the time to look into livXmpp and modify it.

Try:

sudo apt-get update
sudo apt-get install python-xmpp

This worked for me on Raspbian Jessie.

Best,
-Alfred