Introduction to mqtt protocol

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MQTT

MQTT 【Message Queuing Telemetry Transport】, It is expressed as message queue telemetry transmission protocol ;
It's based on Publishing / subscribe (Publish/Subscribe) Mode " Lightweight " Communication protocol , The agreement is built on TCP/IP Agreement on .

MQTT The biggest advantage is ： With very little code and limited broadband , Provide reliable message service for connecting remote devices ;
As an expense 、 Instant messaging protocol with low broadband occupancy , In making its Internet of things 、 Small equipment 、 Mobile applications are widely used .

MQTT It's a client based - Server news release / Subscription transport protocol .MQTT The agreement is light weight 、 Simple 、 Open and easy to implement , These features make it very versatile . In many cases , Including in a limited environment , Such as ： Machines and machines （M2M） Communications and the Internet of things （IoT）;
Its presence , Communication of sensors via satellite link 、 Occasionally dialing medical devices 、 Smart home 、 And some miniaturized equipments have been widely used .

MQTT client

A use MQTT Protocol applications or devices , It always establishes a network connection to the server . The client can ：

① Publish information that other clients may subscribe to ;
② Subscribe to messages published by other clients ;
③ Unsubscribe or delete messages from the application ;
④ Disconnect from the server .

MQTT The server

MQTT The server is called " The message broker "（Broker）, It can be an application or a device . It is between the publisher and the subscriber , It can ：

① Accept network connections from customers ;
② Accept application information released by customers ;
③ Handle subscription and unsubscribe requests from clients ;
④ Forward application messages to subscribers .

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