Develop with Java SDK

This topic describes how to develop a program to control smart devices based on the open capabilities and SDK of the Tuya IoT Development Platform.

Prerequisites

• You have created a project.
• You have added a device.

Procedure

Step 1: Set up development environment

This step is based on the Tuya-connector-Java SDK. Tuya-connector helps you efficiently create cloud development projects regarding the OpenAPI or message subscription capabilities. You can put all the focus on business logic without taking care of server-side programming nor relational databases. Perform the following steps:

1. Get the SDK address at Tuya-connector-Java.

   

2. Go to Projects > Get from VCS > URL, enter the SDK address, and then click Clone.
   

3. On IntelliJ IDEA, set the JDK version to JDK8.
   

   Note: Tuya-connector Java SDK is currently compatible with JDK8 and JDK11. You can change the version to JDK11 in a way similar to that of JDK8.

   1. Choose File > Project Structure > Project > Project SDK, and find Add SDK > Download JDK.
      
   2. Choose the version 1.8.0_*** JDK of any manufacturer.
      
   3. Select the JDK version 1.8.0_*** in Project SDK.
      
   4. Select 8 in Project language level.
      
   5. Click Apply > OK.

4. Add the tuya-spring-boot-starter-sample module.
   

   1. Choose File > Project Structure > Modules, and click + > Import Module.
      
   2. Import tuya-spring-boot-starter-sample from the SDK file address.
      
   3. Import the module from Maven.
      
   4. Click Finish.

Step 2: Edit profile

Before development, you need to configure environment variables in the application.properties file.

1. Go to the Tuya IoT Platform and select your cloud project. Click Overview and find the Cloud Application Authorization Key, including Access ID and Access Secret.

   

2. Configure environment variables in the application.properties file.

   • connector.ak: Enter the value of Access ID in the Authorization Key section.
   • connector.sk: Enter the value of Access Secret in the Authorization Key section.
   • connector.region: Enter the value of Data Center in TuyaRegion.java document.
     

   	# ClientId & SecretKey generated on the platform
   	connector.ak=fsxg5c9jasdrolc**** //ClientId
   	connector.sk=d064654cd2714286a3823f16a223**** //SecretKey
        connector.region=US //Data Center 
   

Step 3: Control device

After the environment is ready, you can start your coding journey.

Note: The strip lights are controlled in this example. The standard instruction for turning lights on/off is the switch_led. If you want to control other devices, query the standard instruction set and modify the code.

1. Create the Connector interface, which is the mapping class of OpenAPI.
   

   Sample code:

   package com.tuya.open.spring.boot.sample.ability.api;
   
   import com.tuya.connector.api.annotations.*;
   import com.tuya.open.spring.boot.sample.ability.model.Device;
   
   
   
   public interface DeviceConnector {
       //Get the device information
       @GET("/v1.0/iot-03/devices/{device_id}")
       Device getById(@Path("device_id") String deviceId);
       //Send commands
       @POST("/v1.0/iot-03/devices/{device_id}/commands")
       Boolean commands(@Path("device_id") String deviceId, @Body Object commands);
   }	
   

2. Import DeviceConnector.
   

   Sample code:

   package com.tuya.open.spring.boot.sample.service;
   
   import com.tuya.open.spring.boot.sample.ability.api.DeviceConnector;
   import com.tuya.open.spring.boot.sample.ability.model.Device;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Service;
   import java.util.Map;
   
   @Service
   public class DeviceService {
       @Autowired
       private DeviceConnector connector;
   
       public Device getById(String deviceId) {
           return connector.getById(deviceId);
       }
   
       public Boolean commands(String deviceId, Map<String, Object> commonds) {
           return connector.commands(deviceId, commonds);
       }
   
   }	
   

3. Create a test interface.
   

   Sample code:

   package com.tuya.open.spring.boot.sample;
   
   import com.tuya.open.spring.boot.sample.ability.api.DeviceConnector;
   import org.junit.jupiter.api.Test;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.boot.test.context.SpringBootTest;
   import java.util.ArrayList;
   import java.util.List;
   
   @SpringBootTest
   public class DemoAplicationTest {
   
       @Autowired
       DeviceConnector deviceConnector;
   
       @Test
       void DevicegetById(){
           System.out.println(deviceConnector.getById("vdevo16274430851****"));
       }
       @Test
       void Controldevice(){
           CommandWrapper cmdWrapper = new CommandWrapper();
           cmdWrapper.commands = new ArrayList<>();
           cmdWrapper.commands.add(new Command());
           cmdWrapper.commands.get(0).code = "switch_led";
           cmdWrapper.commands.get(0).value = true;
           System.out.println(deviceConnector.commands("vdevo16274430851****",cmdWrapper));
       }
       static class Command{
           String code;
           Object value;
       }
       static class CommandWrapper{
           List<Command> commands;
       }
   }	
   

   Sample response

   • Get device information:

     2021-08-03 20:17:15.625  INFO 34281 --- [           main] c.t.o.s.boot.sample.DemoAplicationTest   : Started DemoAplicationTest in 3.49 seconds (JVM running for 5.157)
     2021-08-03 20:17:16.408  INFO 34281 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : URL PATH: /v1.0/iot-03/devices/vdevo162799080003567
     2021-08-03 20:17:16.431  INFO 34281 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : URL PATH: /v1.0/token
     2021-08-03 20:17:16.441  INFO 34281 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : headers==>{t=1627993036432, sign_method=HMAC-SHA256, sign=DDE5D9982B2DF6C****875D332****01F06F****4173A78C47064DBAB291D, lang=zh, nonce=, client_id=fsxg5c9jasdrolc****, Signature-Headers=}
     2021-08-03 20:17:16.839  INFO 34281 --- [           main] c.t.c.open.api.token.TuyaTokenManager    : Get token success, token: TuyaToken(access_token=3ce6061f2****6772216****fef9, expire_time=5030, refresh_token=e0f****8177b970b85****456dcd, uid=******869632028HJBe)
     2021-08-03 20:17:16.840  INFO 34281 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : headers==>{access_token=3ce6061****f2791****32b9863fef9, t=1627993036840, sign_method=HMAC-SHA256, sign=44D74E6D08B6248260B4D6BDA****AD61475C31D3E****E73078E97612, lang=zh, nonce=, client_id=fsxg5c9jasdrolc****, Signature-Headers=}
     Device(active_time=1627990800, biz_type=0, category=dj, create_time=1627990800, icon=smart/program_****_****/dj.png, id=vdevo16274430851****, ip=, local_key=25bfe******5b257, model=, name=smart bulb, online=true, owner_id=null, product_id=yju2e******jr5zx, product_name=smart bulb, status=null, sub=false, time_zone=+08:00, uid=null, update_time=1627990800, uuid=vdevo16274430851****)
     2021-08-03 20:17:16.972  INFO 34281 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
     

   • Send commands:

     2021-08-03 20:20:30.101  INFO 34299 --- [           main] c.t.o.s.boot.sample.DemoAplicationTest   : Started DemoAplicationTest in 3.401 seconds (JVM running for 5.127)
     2021-08-03 20:20:31.192  INFO 34299 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : URL PATH: /v1.0/iot-03/devices/vdevo16274430851****/commands
     2021-08-03 20:20:31.216  INFO 34299 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : URL PATH: /v1.0/token
     2021-08-03 20:20:31.227  INFO 34299 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : headers==>{t=1627993231217, sign_method=HMAC-SHA256, sign=8589C29441071F26************3178E2426DCD425DF****89ACDFB01882A, lang=zh, nonce=, client_id=fsxg5c9jasdrolc****, Signature-Headers=}
     2021-08-03 20:20:31.738  INFO 34299 --- [           main] c.t.c.open.api.token.TuyaTokenManager    : Get token success, token: TuyaToken(access_token=3ce6061f279186772****2b9863fef9, expire_time=4835, refresh_token=e0fbd2e****177b970b854e456dcd, uid=*******869632028HJBe)
     2021-08-03 20:20:31.741  INFO 34299 --- [           main] c.t.c.o.api.header.TuyaHeaderProcessor   : headers==>{access_token=3ce6061f2****772216632b9863fef9, t=1627993231739, sign_method=HMAC-SHA256, sign=1570645BFE1716C7C1CF9****413B928EFAC7CBE84D****A175671396, lang=zh, nonce=, client_id=fsxg5c9jasdrolc****, Signature-Headers=}
     true
     

Step 4: Dispatch and subscribe to messages

The code implements the interface for message dispatching in the connector framework. The dispatcher features message ordering and data decryption. This allows you to create specific message types and publish messages based on Spring’s event mechanism.

Note: The message service is required to enable this feature.

1. Set @ConnectorScan for the class of the Spring Boot application. You can set @EnableMessaging to enable the message subscription capability.

   

   Sample code:

   	package com.tuya.open.spring.boot.sample;
   
   	import com.tuya.connector.open.messaging.autoconfig.EnableMessaging;
   	import com.tuya.connector.spring.annotations.ConnectorScan;
   	import org.springframework.boot.SpringApplication;
   	import org.springframework.boot.autoconfigure.SpringBootApplication;
   
   	@ConnectorScan(basePackages = "com.tuya.open.spring.boot.sample.ability.api")
   	@EnableMessaging // Enable message subscription
   	@SpringBootApplication
   	public class TuyaSpringBootStarterSampleApplication {
   
   	    public static void main(String[] args) {
   	        SpringApplication.run(TuyaSpringBootStarterSampleApplication.class, args);
   	    }
   
   	}
   
   

2. Subscribe to message events
   You can add ApplicationListener to listen for required events. The framework includes all the Tuya’s message event types. The message data contains ciphertext messages and plaintext messages.

   

   Sample code:

   package com.tuya.open.spring.boot.sample.ability.messaging;
   
   import com.tuya.connector.open.messaging.event.NameUpdateMessage;
   import com.tuya.connector.open.messaging.event.StatusReportMessage;
   import lombok.extern.slf4j.Slf4j;
   import org.springframework.context.event.EventListener;
   import org.springframework.stereotype.Component;
   
   @Slf4j
   @Component
   public class TuyaMessageListener {
   
       @EventListener
       public void updateStatusEvent(StatusReportMessage message) {
   
           log.info("StatusReport event happened: {}", message);
       }
   
       @EventListener
       public void nameUpdateMessage(NameUpdateMessage message) {
           log.info("NameUpdate event happened: {}", message);
       }
   
   }
   
   

   Sample response

   2021-07-27 10:37:28,087  INFO 33746 --- [pool-2-thread-1] c.t.o.s.b.s.a.m.TuyaMessageListener      : StatusReport event happened: {"356c93f2-3929-4a8f-ae28-ae5607efc7ad","devId":"***1626937310799","productKey":"yju2******ujr5zx","sourceMessage":{"data":"AAAADN2q/ueLzZE78ubHsQ9Nk+iUBd7QOfPyB78P2Fspm2rMMHYymWYVnZL1m*****/kpPaGVDXsAIlrIIaM6k6wWWAezW7SJLF6gER*****/GQ24QYahT3UvadDx4v45sWuyssg33sX1uC0PFP9kvghc8o9Q1QELGFgmc7JPb0FQ4HDxW98DJPCeIgYTWmmz+BHoaDbH6iOV0SEcsi6vlFGtYQ*****/t/O/g0bTT9RdnmLbGxllJjedwBA2c6XPKNv7HHrouF7LfTDmXwFHml5q6*****","protocol":4,"pv":"2.0","sign":"65f7dcb59************74e93484e7************fae4dcb3e******fbee66","t":1627353446615},"status":[{"code":"switch_led","t":1627353446615,"value":False}]}
   

Conclusion

This topic describes how to use the Java SDK based on the Tuya IoT Development Platform. You can call device APIs to control smart devices and listen for device status. Thanks to the standard ecosystem of devices, you can extend this control method to all ‘Powered by Tuya’ devices, and accelerate your SaaS development based on smart devices without regard to device differences.