Code Generator

Introduction

The SDK provides a device code generator that requires downloading the SDK source code. Simply provide the product model file to automatically generate the device code framework. The code generator parses the device model file, generates service classes for each defined service, creates a device main class, instantiates a device in the main function, and registers the device service instance.

Procedure

1. Generate the product model code.
   1. Download the huaweicloud-iot-device-sdk-java project, decompress it, go to the huaweicloud-iot-device-sdk-java directory, and run the mvn install command.
      Figure 1 Running the compilation command
      
   2. Check whether an executable JAR package is generated in the target folder of iot-device-code-generator.
      Figure 2 Generating an executable JAR package
      
   3. Save the product model to a local directory. For example, save the smokeDetector.zip file to disk D.
   4. Access the SDK root directory and run the java -jar .\iot-device-code-generator\target\iot-device-code-generator-1.2.0-with-deps.jar D:\smokeDetector.zip command.
      Figure 3 Running the code generation command
      
   5. Check whether the generated-demo package is generated in the huaweicloud-iot-device-sdk-java directory. If yes, the device code is generated successfully.
      Figure 4 Code generated
      
2. Write and run the product model code.
   1. Access huaweicloud-iot-device-sdk-java\generated-demo and run the mvn install command.

      

      

   2. Run the java -jar .\target\iot-device-demo-ganerated-1.2.0-with-deps.jar ssl://Domain name:8883 device_id secret command. The three parameters are the device access address, device ID, and password, respectively. Run the generated demo.

      D:\git\huaweicloud-iot-device-sdk-java\generated-demo> java -jar .\target\iot-device-demo-ganerated-1.2.0-with-deps.jar ssl://Domain name:8883 5e06bfee334dd4f33759f5b3_demo secret
      2024-04-17 15:50:53  INFO AbstractService:73 - create device, the deviceId is 5e06bfee334dd4f33759f5b3_demo
      2024-04-17 15:50:54 INFO MqttConnection:204 - try to connect to ssl://Domain name: 8883
      2024-04-17 15:50:55 INFO MqttConnection:228 - connect success, the uri is ssl://Domain name: 8883

3. Modify the product model code. Service definition and registration have already been completed through the generated code. You only need to make small changes to the code.
   • Command API: Add specific implementation logic.

     

   • getter method: Change the value return mode of the generated code from returning a random value to reading from the sensor.
   • setter method: Add specific processing logic, such as delivering instructions to the sensor, because the generated code only modifies and saves the properties.