huaweicloud-iot-device-sdk-java提供设备接入华为云IoT物联网平台的Java版本的SDK,提供设备和平台之间通讯能力,以及设备服务、网关服务、OTA等高级服务,并且针对各种场景提供了丰富的demo代码。IoT设备开发者使用SDK可以大大简化开发复杂度,快速的接入平台。
- 支持设备消息、属性上报、属性读写、命令下发
- 支持网关服务、子设备管理、子设备消息转发
- 支持设备OTA服务
- 支持面向物模型编程
- 提供设备代码生成器根据产品模型自动生成设备代码
- 支持密码认证和证书认证两种设备认证方式
- 支持自定义topic
依赖的版本:
- JDK :1.8 +
huaweicloud-iot-device-sdk-java已经发布到公共仓库,如果要使用,可以使用dependencyManagement引入依赖。
<dependency>
<groupId>com.huaweicloud.iot</groupId>
<artifactId>iot-device-sdk-java</artifactId>
<version>1.0.0</version>
</dependency>
创建设备并初始化
IoTDevice device = new IoTDevice("ssl://iot-mqtts.cn-north-4.myhuaweicloud.com:8883",
"5e06bfee334dd4f33759f5b3_demo", "mysecret");
if (device.init() != 0) {
return;
}
上报设备消息:
device.getClient().reportDeviceMessage(new DeviceMessage("hello"), new ActionListener() {
@Override
public void onSuccess(Object context) {
log.info("reportDeviceMessage success: ");
}
@Override
public void onFailure(Object context, Throwable var2) {
log.error("reportDeviceMessage fail: "+var2);
}
});
上报自定义topic消息(注意需要先在平台配置自定义topic):
String topic = "$oc/devices/"+ device.getDeviceId() + "/user/wpy";
device.getClient().publishRawMessage(new RawMessage(topic, "hello raw message "),
new ActionListener() {
@Override
public void onSuccess(Object context) {
log.info("publishRawMessage ok: ");
}
@Override
public void onFailure(Object context, Throwable var2) {
log.error("publishRawMessage fail: " + var2);
}
});
完整代码参见MessageSample.java
Map<String ,Object> json = new HashMap<>();
Random rand = new Random();
//按照物模型设置属性
json.put("alarm", alarm);
json.put("temperature", rand.nextFloat()*100.0f);
json.put("humidity", rand.nextFloat()*100.0f);
json.put("smokeConcentration", rand.nextFloat() * 100.0f);
ServiceProperty serviceProperty = new ServiceProperty();
serviceProperty.setProperties(json);
serviceProperty.setServiceId("smokeDetector");//serviceId要和物模型一致
device.getClient().reportProperties(Arrays.asList(serviceProperty), new ActionListener() {
@Override
public void onSuccess(Object context) {
log.info("reportProperties success" );
}
@Override
public void onFailure(Object context, Throwable var2) {
log.error("reportProperties failed" + var2.toString());
} });
完整代码参见PropertySample.java
Map<String ,Object> json = new HashMap<>();
Random rand = new Random();
String subdeviceId = "xxxxx";
//按照物模型设置属性
json.put("alarm", alarm);
json.put("temperature", rand.nextFloat()*100.0f);
json.put("humidity", rand.nextFloat()*100.0f);
json.put("smokeConcentration", rand.nextFloat() * 100.0f);
ServiceProperty serviceProperty = new ServiceProperty();
serviceProperty.setProperties(json);
serviceProperty.setServiceId("smokeDetector");//serviceId要和物模型一致
device.getClient().reportProperties(subdeviceId, Arrays.asList(serviceProperty), new ActionListener() {
@Override
public void onSuccess(Object context) {
log.info("reportProperties success" );
}
@Override
public void onFailure(Object context, Throwable var2) {
log.error("reportProperties failed" + var2.toString());
} });
device.getClient().setPropertyListener(new PropertyListener() {
//处理写属性
@Override
public void onPropertiesSet(String requestId, List<ServiceProperty> services) {
//遍历service
for (ServiceProperty serviceProperty: services){
log.info("OnPropertiesSet, serviceId = " + serviceProperty.getServiceId());
//遍历属性
for (String name :serviceProperty.getProperties().keySet()){
log.info("property name = "+ name);
log.info("set property value = "+ serviceProperty.getProperties().get(name));
if (name.equals("alarm")){
//修改本地值
alarm = (Integer) serviceProperty.getProperties().get(name);
}
}
}
//修改本地的属性值
device.getClient().respondPropsSet(requestId, IotResult.SUCCESS);
}
//处理读属性
@Override
public void onPropertiesGet(String requestId, String serviceId) {
log.info("OnPropertiesGet " + serviceId);
Map<String ,Object> json = new HashMap<>();
Random rand = new Random();
json.put("alarm", alarm);
json.put("temperature", rand.nextFloat()*100.0f);
json.put("humidity", rand.nextFloat()*100.0f);
json.put("smokeConcentration", rand.nextFloat() * 100.0f);
ServiceProperty serviceProperty = new ServiceProperty();
serviceProperty.setProperties(json);
serviceProperty.setServiceId("smokeDetector");
device.getClient().respondPropsGet(requestId, Arrays.asList(serviceProperty));
}
});
完整代码参见PropertySample.java
client.setCommandListener(new CommandListener() {
@Override
public void onCommand(String requestId, String serviceId, String commandName, Map<String, Object> paras) {
log.info("onCommand, serviceId = " +serviceId);
log.info("onCommand , name = " + commandName);
log.info("onCommand, paras = " + paras.toString());
//处理命令
//发送命令响应
device.getClient().respondCommand(requestId, new CommandRsp(0));
} });
完整代码参见CommandSample.java
面向物模型编程指的是,基于SDK提供的物模型抽象能力,设备代码只需要按照物模型定义设备服务,SDK就能自动的和平台通讯,完成属性的同步和命令的调用。 相比直接调用客户端接口和平台进行通讯,面向物模型编程简化了设备侧代码的复杂度,让设备代码只需要关注业务,而不用关注和平台的通讯过程。
首先定义一个烟感服务类,继承自AbstractService
public static class SmokeDetectorService extends AbstractService {
}
定义服务属性,属性和产品模型保持一致。writeable用来标识属性是否可写
@Property(name = "alarm", writeable = true)
int smokeAlarm = 0;
@Property(name = "smokeConcentration", writeable = false)
float concentration = 0.0f;
@Property(writeable = false)
int humidity;
@Property(writeable = false)
float temperature;
定义属性的读写接口: getter接口为读接口,在属性上报和平台主动查属性时被sdk调用 setter接口为写接口,在平台修改属性时被sdk调用,如果属性是只读的,则setter接口保留空实现。
public int getHumidity() {
//模拟从传感器读取数据
humidity = new Random().nextInt(100);
return humidity;
}
public void setHumidity(int humidity) {
//humidity是只读的,不需要实现
}
public float getTemperature() {
//模拟从传感器读取数据
temperature = new Random().nextInt(100);
return temperature;
}
public void setTemperature(float temperature) {
//只读字段不需要实现set接口
}
public float getConcentration() {
//模拟从传感器读取数据
concentration = new Random().nextFloat()*100.0f;
return concentration;
}
public void setConcentration(float concentration) {
//只读字段不需要实现set接口
}
public int getSmokeAlarm() {
return smokeAlarm;
}
public void setSmokeAlarm(int smokeAlarm) {
this.smokeAlarm = smokeAlarm;
if (smokeAlarm == 0){
log.info("alarm is cleared by app");
}
}
定义服务的命令: 命令的入参和返回值类型固定不能修改。
@DeviceCommand(name = "ringAlarm")
public CommandRsp alarm(Map<String, Object> paras) {
int duration = (int) paras.get("duration");
log.info("ringAlarm duration = " + duration);
return new CommandRsp(0);
}
上面完成了服务的定义 接下来创建设备,注册烟感服务,然后初始化设备:
//创建设备
IoTDevice device = new IoTDevice("ssl://iot-mqtts.cn-north-4.myhuaweicloud.com:8883",
"5e06bfee334dd4f33759f5b3_demo", "mysecret");
//创建设备服务
SmokeDetectorService smokeDetectorService = new SmokeDetectorService();
device.addService("smokeDetector", smokeDetectorService);
if (device.init() != 0) {
return;
}
启动服务属性自动周期上报
smokeDetectorService.enableAutoReport(10000);
上面基于物模型编程中,要求服务的定义必须和产品模型保持一致,基于这一点,我们提供了代码生成器,能根据产品模型自动生成设备代码。 代码生成器的源码在iot-device-code-generator目录 具体参见
完整代码参见X509CertificateDeviceSample.java
首选读取证书,如果是pem格式的证书:
KeyStore keyStore = DemoUtil.getKeyStore("D:\\SDK\\cert\\deviceCert.pem", "D:\\SDK\\cert\\deviceCert.key", "keypassword");
如果是keystore格式证书:
KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(new FileInputStream("D:\\SDK\\cert\\my.keystore"), "keystorepassword".toCharArray());
然后使用证书创建设备
IoTDevice iotDevice = new IoTDevice("ssl://iot-mqtts.cn-north-4.myhuaweicloud.com:8883",
"5e06bfee334dd4f33759f5b3_demo3", keyStore, "keypassword");
SDK的开源License类型为 BSD 3-Clause License。详情参见LICENSE.txt
1、创建github账号 2、fork huaweicloud-iot-device-sdk-java源代码 3、同步huaweicloud-iot-device-sdk-java主仓库代码到fork的仓库 4、在本地修改代码并push到fork的仓库 5、在fork的仓库提交pull request到主仓库
1、增加压缩接口
2、隐式订阅