如何在Cumulocity中获得设备的受支持的测量值? [英] How to get supported measurements of a device in Cumulocity?
问题描述
使用模拟设备时，您可以从"c8y_SupportedMeasurements"字段中获得其支持的测量值(例如，fragmentTypes)，例如，温度传感器的外观如下:
When using a simulated device you can get its supported measurements (i.e. fragmentTypes) from the "c8y_SupportedMeasurements" field which for example for a temperature sensor looks as follows:
c8y_SupportedMeasurements:[ "c8y_TemperatureMeasurement" ]
c8y_SupportedMeasurements: [ "c8y_TemperatureMeasurement" ]
使用真实设备时，此字段不可用.在获取特定设备的测量值时，我可以看到可能的fragmentTypes
When using a real device this field is not available. I can see the possible fragmentTypes when fetching the fetching the measurements for that particular device
/measurement/measurements?source = id
/measurement/measurements?source=id
为我提供了以下fragmentTypes的测量列表:
which gives me a list of measurements for the following fragmentTypes:
-
湿度传感器
Humidity sensor
温度传感器
电池
以类似于模拟器和"c8y_SupportedMeasurements"字段的方式来获取设备支持的fragmentTypes的正确方法是什么?
What is the correct way to fetch the supported fragmentTypes for a device in a similar way as it can be done with the simulators and the "c8y_SupportedMeasurements"-field?
推荐答案
c8y_SupportedMeasurements是由Cumulocity自动生成的碎片.当设备发送带有新片段的测量值时，它将更新.
The c8y_SupportedMeasurements is an automatically generated fragement by Cumulocity. It updates when the device sends a measurement with a new fragment in it.
您可以直接查询支持的测量结果，例如这样的设备(它将仅返回c8y_SupportedMeasurements而不是整个设备对象):
You can query supported measurements directly for a device like this (it will return only the c8y_SupportedMeasurements instead of the whole device object):
/inventory/managedObjects/{{deviceId}}/supportedMeasurements
/inventory/managedObjects/{{deviceId}}/supportedMeasurements
如果此时不存在碎片，则此调用还将触发基于设备的历史数据的supportedMeasurements的初始计算.
This call will also trigger the initial calculation of supportedMeasurements based on the historic data of the device if the fragement did not exist at that point.
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