XMPP - protocal basics, XEPs and features Ejabberd - introduction, feature list, uses, support, installation, configurations, admin panel access, chat demo etc.

1. Let’s start
With Kunal Saxena - SSE - Algoworks

2. XMPP
Extensible Messaging and Presence Protocol (XMPP) is an open XML technology for real-time communication
Key XMPP technologies:
Core — information about the core XMPP technologies for XML streaming
Jingle — SIP-compatible multimedia signalling for voice, video, file transfer, and other applications
Multi-User Chat — flexible, multi-party communication
PubSub — alerts and notifications for data syndication, rich presence, and more
BOSH — an HTTP binding for XMPP (and other) traffic

3. How it works
Interleaved XML document streams:
Client and server streams form an XML document.
● First level tag: <stream>
● 3 types of second levels tags:
– message: asynchronous communications
– iq: Synchronous communications
– presence: presence and status data

4. Simple Representation of xmpp
communication
|--------------------|
| <stream> |
|--------------------|
| <presence> |
| <show/> |
| </presence> |
|--------------------|
| <message to='foo'> |
| <body/> |
| </message> |
|--------------------|
| <iq to='bar'> |
| <query/> |
| </iq> |
|--------------------|
| ... |
|--------------------|
| </stream> |
|--------------------|

5. Another
representation

6. Ejabberd server
● ejabberd is an Erlang-based XMPP implementation.
● It has been designed to support clustering, fault-tolerance and high availability.
● It supports many features and extensions of xmpp protocol:
– Built-in Multi-User Chat service
– Distributed database (Mnesia)
– Built-in IRC transport
– Built-in Publish-Subscribe service

7. Introduction
https://docs.ejabberd.im/admin/introduction/

8. features
Full ejabberd XEP list
https://www.process-one.net/en/ejabberd/protocols/

9. architecture

10. installation
Link to installation notes
Requirements in https://docs.ejabberd.im/admin/installation/
git clone git://github.com/processone/ejabberd.git ejabberd
cd ejabberd
./autogen.sh
./configure
make install

11. Starting ejabberd
prompt> ejabberdctl start
prompt> ejabberdctl status
The node ejabberd@localhost is started with status: started
ejabberd is running in that node
prompt> ejabberdctl stop

12. configurations
Add user
ejabberdctl register admin1 example.org FgT5bk3
Enable Admin Account - go to /etc/ejabberd/ejabberd.yml
acl:
admin:
user:
- "admin1": "example.org"
access:
configure:
admin: allow

13. Admin Panel - http://localhost:5280/admin/

14. working with chat - demo with pidgin

15. Ejabberd message customizations
You have To, From and Message in XMPP xml document,
Customize message part with JSON

16. dive to ejabberd source

17. integrate the enabled module via API
##
## Modules enabled in all ejabberd virtual hosts.
##
modules:
mod_snatch_custom: {}
mod_adhoc: {}
mod_admin_extra: {}

18. How to save chat on server or update message
read/unread count
XEP-0313: Message Archive Management
https://blog.process-one.net/ejabberd-15-06/

19. thanks.