业务接口调用方法

//得到NorthApiClient实例后，再使用northApiClient得到鉴权类实例
Authentication authentication = new Authentication(northApiClient);

//调用鉴权类实例authentication提供的业务接口，如getAuthToken
AuthOutDTO authOutDTO = authentication.getAuthToken();

//从返回的结构体authOutDTO中获取需要的参数，如accessToken
String accessToken = authOutDTO.getAccessToken();

//得到NorthApiClient实例后，再使用northApiClient得到订阅类实例
SubscriptionManagement subscriptionManagement = new SubscriptionManagement(northApiClient);

//先设置好subDeviceData的第一个入参SubDeviceDataInDTO结构体
SubDeviceDataInDTO sddInDTO = new SubDeviceDataInDTO();
sddInDTO.setNotifyType("deviceDataChanged");
//需要根据实际情况修改回调的ip和端口
ddInDTO.setCallbackUrl("https://XXX.XXX.XXX.XXX:8099/v1.0.0/messageReceiver");
try {
    //调用订阅类实例subscriptionManagement提供的业务接口，如subDeviceData
    SubscriptionDTO subDTO = subscriptionManagement.subDeviceData(sddInDTO, null, accessToken);
    System.out.println(subDTO.toString());
} catch (NorthApiException e) {
    System.out.println(e.toString());
}

//得到NorthApiClient实例后，再使用northApiClient得到设备管理类实例
DeviceManagement deviceManagement = new DeviceManagement(northApiClient);

//设置好注册设备接口的第一个入参RegDirectDeviceInDTO2结构体
RegDirectDeviceInDTO2 rddInDTO = new RegDirectDeviceInDTO2();
String nodeid = "86370303XXXXXX"; //this is a test imei
String verifyCode = nodeid;
rddInDTO.setNodeId(nodeid);
rddInDTO.setVerifyCode(verifyCode);
rddInDTO.setTimeout(timeout);

//调用设备管理类实例deviceManagement提供的业务接口，如regDirectDevice
RegDirectDeviceOutDTO rddod = deviceManagement.regDirectDevice(rddInDTO, null, accessToken);

//从返回的结构体rddod中获取需要的参数，如deviceId
String deviceId = rddod.getDeviceId();