iOS development and expansion Chapter-XMPP Brief Introduction

Source: Internet
Author: User
Tags abstract definition dedicated server

iOS development and expansion Chapter-XMPP Brief Introduction

First, instant communication Brief introduction

1. Brief description

Instant Messaging Technology (IM) enables users to chat online in real time. If you want to send a message, the user needs to open a small window to let the user and his friends enter the information and let the conversation both see what they're talking about.

There are many IM systems, such as AOL IM, Yahoo IM, MSN and QQ, their biggest difference is the implementation of their own communication protocol , so the core of instant messaging technology is its transport protocol

Protocol is used to describe how the information is transmitted on the network, if there is a unified transport protocol, then you should be able to achieve direct communication between the various IM, in order to create a unified standard of instant messaging, The existing IM protocols include: The initial protocol of the IETF Dialogue Initiation Protocol (SIP) and the Instant Messaging dialog and the expression Extension Protocol (simple), the Application Switching Protocol (APEX), Display and Instant Messaging Protocol (PRIM) and XML-based, open extensible Communication and Presentation Protocol (XMPP) protocol (often referred to as the Jabber protocol)

The industry has tried many times to unify the standards of major IM Vendors (AOL, Yahoo, and Microsoft) without success, and every IM continues to use its own protocols

2. Compliance with XMPP Instant Messenger protocol
Design an Instant Messaging protocol that is used all over the world and can be interconnected, no matter what instant messaging software is used.

3. The significance of instant messaging in vertical social networking

Unlike the first generation of chatty's level Web site (also known as a comprehensive website), vertical sites are focusing on specific areas or specific needs, providing all-in-depth information and related services on this area or demand, and as a new highlight of the Internet, vertical websites are attracting more and more attention. In more and more networks to attract the attention of ordinary people, netizens are gradually out of fashion, curiosity of the initial stage, and constantly on the Internet to find practical, practical and affordable. with the development of mobile Internet applications, more and more apps are migrating to vertical applications, communication between similar user groups in vertical applications, resulting in aggregation is particularly important, so the current domestic market XMPP application development talent demand is very large

The origin of the 4.XMPP

XMPP is an XML-based protocol for instant Messaging (IM) and online on-site probing. Initially, XMPP was developed as a framework with the goal of supporting instant messaging and online presence applications within an enterprise environment. The Instant Messaging network was private and not suitable for enterprise use. XMPP formerly known as Jabber (1998), is an open source organization-defined Network Instant Messaging protocol

XMPP is a decentralized communication network, which means that any XMPP user can deliver messages to any other XMPP user as long as the network infrastructure allows. Multiple XMPP servers can also communicate with each other through a dedicated server-server protocol, providing the possibility to create a decentralized social network and collaboration framework

Although XMPP appears to meet the requirements of " personal-personal " instant messaging, it does not have to be limited to this task at all

Ii. XMPP-related

1.XMPP Introduction

XMPP is an XML-based protocol that inherits the flexibility of development in an XML environment. This indicates that XMPP is extensible. Applications such as content publishing systems and address-based services can be built on top of XMPP by sending extended information to handle the user's needs. Furthermore, XMPP contains software protocols for the server side that enable it to talk to the other, making it easier for developers to build customer applications or add functionality to a configured system
The definition of the core XML streaming Protocol for XMPP enables XMPP to be on a more standardized platform than the previous network communication protocol. With the help of XML's easy parsing and reading features, the protocol of XMPP can be very beautiful
The Instant Messenger extension Application section of XMPP is based on an abstract definition of instant messaging by the IETF prior to this, with other widely used instant messaging protocols such as AIM,QQ, which are functionally complete, perfect, etc.
XMPP's extended protocol jingle makes IT support voice and video, and currently iOS does not yet support
The official documentation for XMPP is RFC 3920
The XMPP protocol was once a Google push Instant messaging protocol, and its representative work was gtalk.

Note: Relative Xml,json is more efficient.

2.Google Talk Description

Google Talk is Google's IM tool, in addition to the IM features, plus voip features, "Clean and Generous interface", can be directly linked to Gmail, to accept the view of the mail. because Google Talk is based on the Jabber open source standard, this standard allows users to connect to other instant messaging systems, such as the Ichat,gaim,trillian Pro and PSI for Apple computers. Google talk can only run on Windows platforms. Google Talk users cannot use this software to communicate with Aim,msn Messenger or Yahoo messenger users.

2013 May at the Google I/O conference, Google launched the unified cross-platform chat app Hangouts (hangouts) to replace Google Talk. the XMPP protocol is not supported by Google Hangouts. Communication between Google Hangouts users and non-Google services such as strong supporters of the XMPP protocol is jabber.org.

Currently, Google Wave is based on the XMPP protocol, and Google has developed Jingle extensions for the XMPP protocol-based video chat. Although Google has not announced the closing date for talk, it will not be too far off from Google's off reader and ical support.

3.XMPP definition

XMPP: Theextensible Messaging and Presence Protocol(extensible Communication and Presentation Protocol)

XMPP can be used for streaming XML data in service class real-time communication, representation, and demand response services. XMPP is based on the Jabber protocol, while Jabber is an open protocol commonly used in instant messaging.

XMPP is an XML-based protocol for instant Messaging (IM) and online on-site probing. Facilitates quasi-immediate operations between servers. This agreement may eventually allow Internet users to send instant messages to anyone else on the internet, even if their operating system and browser are different

4. Basic structure

XMPP is a typical C/s architecture, not just like most instant messaging software, using peer-to-client architecture, which means that in most cases, when two clients are communicating, their messages are delivered through the server. With this architecture, the main purpose is to simplify the client and put most of the work on the server side

Three roles, clients, servers, and gateways are defined in XMPP. Communication can occur bidirectional between any two of these three

The server also assumes the client information record, connection management and information routing function. The gateway undertakes the interconnection with the heterogeneous instant communication system, and the heterogeneous system can include SMS (SMS), MSN,ICQ, etc.

The basic network form is that a single client connects to a single server over TCP/IP and then transmits the XML stream on top of it

iOS development and expansion Chapter-XMPP Brief Introduction

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