In addition, this draft defines some terms regarding the PRESENCE service, such as the commands to run, the format of the messages, and how the PRESENCE server notifies the client of changes in the state of the PRESENCE. RFC2779 defines the minimum requirement conditions for IMPP. RFC 2778 is an informative draft that defines the rationale for all PRESENCE and IM services. So far, this organization has published three draft RFCs, but there are two main ones: one for the site space and instant messaging model (RFC 2778) and the other for the instant messaging/space protocol requirement conditions (RFC 2779). IMPP mainly defines the necessary protocols and data formats to build an instant messaging system with spatial reception and publishing capabilities. IMPP(Instant Messaging and Presence Protocol).SIMPLE(session initiation protocol for instant messaging and presence leveraging extensions).XMPP(Extensible Messaging and Presence Protocol).Open protocols are generally highly scalable and can be extended and modified to adapt to special application scenarios and needs.Due to its open nature, the industry has a lot of excellent open source IM Server and IM Client, directly based on these open source components for development, you can quickly build a high-quality Chat base service in a relatively short period of time.It has been researched and verified by the industry for a long time, and is guaranteed in many aspects such as security, completeness and fault tolerance.Private IM protocols need to be designed and built from scratch, which is extremely costly in terms of time and financial resources. Instant protocols can be divided into private protocols (Tencent QQ) and open protocols (GTalk) according to whether they are public or not.
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