Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you about the role of Profile in programming. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

1. What is Profile?

As can be seen in Huawei Cloud's development documentation, Profile (product model) is a file used to describe "what is", "what can be done" and "how to control the device" in a product. How to understand this sentence?

Usually a product or device itself has many physical properties or functions, which people can often see in the product manual. However, in order to manage these devices in the Internet of things platform, it is necessary to let the Internet of things platform know the relevant physical properties or functions of the device, that is, "what device", "what can be done", "how to control it" and so on. And what is the platform of the Internet of things? In fact, it essentially belongs to a computer, or a complex computer system with strong computing power. How can computers understand products or devices in the real physical world? This requires a model, a model that the computer can understand. Computers are best at dealing with data, such as int data, char data, string data, float data, flexible data, and so on. Use this data to represent the properties and functions of the product so that the computer can understand it. How do you express it exactly? Take a look at the specific content analysis of the profile file below.

Content Analysis of 2.Profile File

The product model Profile is essentially an JSON file. The properties and functions of a product or device are expressed through the contents of this file, and must be written in accordance with the format requirements of the file before it can be identified and processed by the computer (in fact, it depends on the programs running in the computer). The rules for writing this file can be found in Huawei Cloud's documentation, which is no longer discussed here.

Usually an Profile file contains the following aspects (in fact, it classifies the functions and attributes of the product or device to be represented, from Huawei Cloud)

The following is part of the Profile file of the street lamp in the Smart Street Lamp Project.

Such basic information is the basic content that needs to be known in the product or equipment management system.

The above is a specific attribute description.

The product model Profile describes the attributes and functions of the product according to the requirements of the file format, and this description information can be automatically parsed by computer software (which is executed in the software program of the Internet of things platform, which is invisible to platform users). What can be done after parsing?

3. The relationship between Profile files and programming

What should be done after the Profile file is automatically parsed by the software of the Internet of things platform? We have said that one of the main functions of the Internet of things platform is product or device management. When developing programs for product and device management systems, you may use an object-oriented programming approach to define the following classes, a simple example

When these classes instantiate the initial values, they use the data values parsed from the product's Profile file.

For example, if you instantiate a product, the value of the variable manufactureName in its basic information can be the China_Factory_01 parsed from the Profile file.

For example, if the attribute lightDimmingValue of the product is transmitted through MQTT protocol or COAP protocol, the data type dateType of this attribute parsed from the Profile file can be used for parsing. You can also determine whether this attribute is a desired attribute or not by parsing. The design of these program functions can use the information parsed from the Profile file.

To sum up, the product model Profile is a JSON file that describes the attributes and functions of the product according to certain format requirements. This file can be parsed automatically by a computer program. The information described in Profile is necessary for the Internet of things platform to manage products or devices. Through this information, the classes in some programs can be initialized, and they can be used to parse the data from communication, and so on.

Different platforms of the Internet of things may have different ways to use information in Profile, but there is one thing that a lot of processing and use of Profile files are invisible to platform users. However, when users develop their own products or equipment management systems based on the Internet of things platform, they must write a correct product model that meets their own management requirements, that is, Profile files, which is necessary and important.

This is what the role of Profile in programming is shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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