What is the difference between MQTT and HTTP protocols?

Let’s understand the concepts of Hypertext Transfer Protocol (HTTP) and MQ Telemetry Transport (MQTT) protocol, and then learn about their differences.

Hypertext Transfer Protocol (HTTP)

Hypertext Transfer Protocol (HTTP) has to be the most commonly used application layer convention on the planet today. It builds the premise for most people to understand the Internet - the World Wide Web.

Its motivation is to provide a lightweight convention for the recovery of Hypertext Markup Language (HTML) and other reports. Network zone settings are all over the Internet. Every time you open a web program and surf the Internet, you are using HTTP over TCP/IP.

Basic HTTP page retrieval

• We should start from the beginning and understand how a basic program Restore web pages from a web server.

• The main point to note is that a web page usually consists of Tons of articles, from HTML libraries to images Content available on the page.

• In general, HTML can be considered as the format of the page, education Content design, text size and tone, basic programming shading of the page, and what different images should be restored to compensate

Consider the process that occurs in an accompanying request as follows -

• The client sends a request to the web server for the intended page.

• The server breaks down the request and sends back a confirmation message to the client along with the HTML code needed to execute the request. page.

• The client will start deciphering the HTML and building the page.

• Customers, discontinued solicitation, will restore any installed items such as pictures or other visual and sound sources.

MQ Telemetry Transport (MQTT)

The MQTT framework consists of clients talking to servers often called "resellers". Customers may be distributors or approvers of data. Every customer can establish a relationship with a merchant.

Data is sorted by subject pecking order. When a distributor has additional information to disseminate, it sends a control message containing that information to the relevant representative.

At this point, the intermediary disseminates the data to all customers who have purchased the product. theme. Distributors do not need any information about the number or regions of endorsers and supporters, so there is no need to design any information about distributors.

If the intermediary earns points, there are no supporters present, and the topic will be processed unless the issuer indicates that it wants to host the topic. This allows new endorsers of an item to get the latest value, rather than waiting for subsequent updates from distributors.

When a distribution customer initially interacts with a merchant, it can establish a default message that is sent to the endorser if the representative discovers that the distribution customer has completely disengaged from the specialist.

Clients simply communicate with the broker, but the framework may contain some intermediary servers that rely on transaction information from their current backer's point of view.

A trivial MQTT control message may only have two bytes of information. If necessary, a control message can convey approximately 256 megabytes of information.

There are 14 characteristic message types used to associate and separate customers from representatives, distribute information, identify information receipts, and direct associations between customers and servers.

MQTT relies on TCP conventions for information transmission. Variants of MQTTSN are used in different vehicles, such as UDP or Bluetooth.

The above is the detailed content of What is the difference between MQTT and HTTP protocols?. For more information, please follow other related articles on the PHP Chinese website!