XMPP - Extensible Messaging and Presence Protocol
===================================================

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        **What is XMPP?**

        XMPP is an open, XML-based communication protocol designed for real-time messaging, presence information,
        and structured data exchange between clients and servers. Originally developed for instant messaging, it
        has evolved to support a wide range of applications including IoT, VoIP, and social networking.

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        **Why is XMPP useful?**

        * Real-time communication – Ideal for chat, notifications, and presence updates.
        * Federated architecture – Like email, anyone can run their own XMPP server.
        * Extensible – Supports custom features via XMPP Extension Protocols (XEPs).
        * Secure – Supports TLS encryption and SASL authentication.
        * Decentralized – No central authority; promotes open communication.

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        **How it works?**

        * Client connects to XMPP server – Using TCP and negotiates TLS and authentication.
        * Authentication – Performed using SASL (Simple Authentication and Security Layer).
        * Session established – Client sends <presence/> to indicate availability.
        * Message exchange – Clients send XML stanzas (message, presence, IQ) through the server.
        * Session ends – Client sends <presence type='unavailable'/> and disconnects.

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        **Where is XMPP used?**

        * Instant messaging apps – Like Jabber, Conversations, and formerly Google Talk.
        * IoT communication – Lightweight and extensible for device-to-device messaging.
        * Enterprise chat systems – Used in internal communication tools.
        * Social networking – Supports presence and status updates.
        * VoIP and video calls – Used as a signaling protocol in some systems.

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        **Which OSI layer does this protocol belong to?**

        * Manages sessions – Maintains long-lived XML streams between client and server.
        * Protocol-agnostic messaging – Can carry any structured data in XML format.
        * Stateful communication – Tracks presence, subscriptions, and message delivery status.

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        Topics in this section,

                * :ref:`Learnings in this section <XMPP_step1>`

                * :ref:`Terminology <XMPP_step2>`

                * :ref:`Version Info <XMPP_step3>`

                * :ref:`XMPP Version&RFC Details <XMPP_step5>`

                * :ref:`XMPP Basic Setup on Ubuntu using IPv4 <XMPP_step19>`

                * :ref:`XMPP Basic Setup on Ubuntu using IPv6 <XMPP_step20>`

                * :ref:`XMPP Protocol Packet Details <XMPP_step6>`

                * :ref:`XMPP Usecases <XMPP_step7>`

                * :ref:`XMPP Basic Features <XMPP_step8>`
                    
                * :ref:`XMPP Feature : XML Based Protocol <XMPP_step9>` 

                * :ref:`XMPP Feature : Real Time Messaging <XMPP_step10>`

                * :ref:`XMPP Feature : Presence Information <XMPP_step11>`  

                * :ref:`XMPP Feature : Federated Architecture <XMPP_step12>`  

                * :ref:`XMPP Feature : Extensiblity via XEPs <XMPP_step13>`

                * :ref:`XMPP Feature : Security Support <XMPP_step14>`

                * :ref:`XMPP Feature : Multiuser chat <XMPP_step15>`   

                * :ref:`XMPP Feature : offline messaging <XMPP_step16>` 

                * :ref:`XMPP Feature : Push Notifications <XMPP_step17>` 

                * :ref:`XMPP Feature : cross platform compatibility <XMPP_step21>`

                * :ref:`Reference links <XMPP_step18>`


.. _XMPP_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _XMPP_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _XMPP_step3:

.. tab-set::

    .. tab-item:: Version Info
    
         * Version Info


.. _XMPP_step5:

.. tab-set::

    .. tab-item:: XMPP Version&RFC Details

        
         .. csv-table:: 
               :file: ./XMPP/XMPP_rfcdetails.csv
               :widths: 10,10,10,30
               :header-rows: 1

.. _XMPP_step19:

.. tab-set::

    .. tab-item:: XMPP Basic Setup on Ubuntu using IPv4

       * setup

.. _XMPP_step20:

.. tab-set::

   .. tab-item:: XMPP Basic Setup on Ubuntu using IPv6
       
      * setup


.. _XMPP_step6:

.. tab-set::

    .. tab-item:: XMPP Protocol Packet Details
       
         **Client Stream Header Packet**

         .. csv-table:: 
                :file: ./XMPP/XMPP_packetdetails1.csv
                :widths: 10,20,30,10
                :header-rows: 1

         **Server Stream Header Packet**

         .. csv-table::
                :file: ./XMPP/XMPP_packetdetails2.csv
                :widths: 10,20,30,10
                :header-rows: 1
        
         **SASL Authentication Packet**
 
         .. csv-table::
                :file: ./XMPP/XMPP_packetdetails3.csv
                :widths: 10,20,30,10
                :header-rows: 1
           
         **Resource Binding Packet**

         .. csv-table::
                :file: ./XMPP/XMPP_packetdetails4.csv
                :widths: 10,20,30,10
                :header-rows: 1


         **Presence Packet**

         .. csv-table::
                :file: ./XMPP/XMPP_packetdetails5.csv
                :widths: 10,20,30,10
                :header-rows: 1

         **Message Packet**

         .. csv-table::
                :file: ./XMPP/XMPP_packetdetails6.csv
                :widths: 10,20,30,10
                :header-rows: 1

         **IQ Packet**

         .. csv-table::
                :file: ./XMPP/XMPP_packetdetails7.csv
                :widths: 10,20,30,10
                :header-rows: 1


.. _XMPP_step7:

.. tab-set::

    .. tab-item:: XMPP Usecases
        
        
         .. csv-table:: 
               :file: ./XMPP/XMPP_usecases.csv
               :widths: 10,20,30
               :header-rows: 1

.. _XMPP_step8:

.. tab-set::

    .. tab-item:: XMPP Basic Features
    
         
         .. csv-table:: 
                  :file: ./XMPP/XMPP_basicfeatures.csv
                  :widths: 10,10,30
                  :header-rows: 1

.. _XMPP_step9:

.. tab-set::

    .. tab-item:: XMPP Feature : XML Based Protocol

          **XML Based Protocol - Testcases**

          .. csv-table:: 
                 :file: ./XMPP/XMPP_feature1_XML_Based_Protocol_testcases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


   
.. _XMPP_step10:

.. tab-set::

    .. tab-item:: XMPP Feature : Real Time Messaging

         **Real Time Messaging - Testcases**

         .. csv-table:: 
                :file: ./XMPP/XMPP_feature2_Real_Time_Messaging_testcases.csv
                :widths: 10,10,30,20
                :header-rows: 1


.. _XMPP_step11:

.. tab-set::

    .. tab-item:: XMPP Feature : Presence Information

        **Presence Information - Testcases**

        .. csv-table:: 
                 :file: ./XMPP/XMPP_feature3_Presence_Information_testcases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


.. _XMPP_step12:

.. tab-set::

    .. tab-item:: XMPP Feature : Federated Architecture

          **Federated Architecture - Testcases**

          .. csv-table:: 
                :file: ./XMPP/XMPP_feature4_Federated_Architecture_testcases.csv
                :widths: 10,10,30,20
                :header-rows: 1



.. _XMPP_step13:

.. tab-set::

    .. tab-item:: XMPP Feature : Extensiblity via XEPs

         **Extensiblity via XEPs - Testcases**

         .. csv-table:: 
                 :file: ./XMPP/XMPP_feature5_Extensiblity_via_XEPs_testcases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


 
.. _XMPP_step14:

.. tab-set::

    .. tab-item:: XMPP Feature : Security Support

         **Security Support - Testcases**

         .. csv-table:: 
                  :file: ./XMPP/XMPP_feature6_Security_Support_testcases.csv
                  :widths: 10,10,30,20
                  :header-rows: 1


.. _XMPP_step15:

.. tab-set::

    .. tab-item:: XMPP Feature : Multiuser chat
   
          **Multiuser chat - Testcases**

          .. csv-table:: 
                 :file: ./XMPP/XMPP_feature7_Multiuser_chat_testcases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


.. _XMPP_step16:

.. tab-set::

    .. tab-item:: XMPP Feature : offline messaging

         **offline messaging - Testcases**

         .. csv-table:: 
                 :file: ./XMPP/XMPP_feature8_offline_messaging_testcases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


.. _XMPP_step17:

.. tab-set::

    .. tab-item:: XMPP Feature : Push Notifications

        **Push Notifications - Testcases**

        .. csv-table::
                :file: ./XMPP/XMPP_feature9_Push_Notifications_testcases.csv
                :widths: 10,10,30,20
                :header-rows: 1

.. _XMPP_step21:

.. tab-set::

    .. tab-item:: XMPP Feature : cross platform compatibility

        **cross platform compatibility - Testcases**

        .. csv-table::
                :file: ./XMPP/XMPP_feature10_cross_platform_compatibility_testcases.csv
                :widths: 10,10,30,20
                :header-rows: 1



.. _XMPP_step18:

.. tab-set::

    .. tab-item:: Reference links
     
       * Reference links