cumulocity - Java Client extracting from Measurements

Question

How can I extract from Measurements like

• c8y_MotionMeasurement
• c8y_AnalogMeasurement
• c8y_SignalStrength

the attributes with Java Client? Example for c8y_MotionMeasurement content:

"c8y_MotionMeasurement":{
    "x":{
        "unit":"m/s^2",
        "value":0.046882
    },
    "y":{
        "unit":"m/s^2",
        "value":0.140647
    },
    "z":{
        "unit":"m/s^2",
        "value":0.984529
    }
}

Thanks

Answer 1

您可以查看 device-capability-model 项目。它已经包含了很多常用的片段。如果您需要的片段存在，您可以在 java 中执行以下操作：

Measurement m = ... // get measurement from c8y
SignalStrength s = m.get(c8y.SignalStrength.class);

如果设备功能模型中不存在该片段，我建议在您的项目中为该片段创建一个类。当然，您始终可以将所有内容都作为地图处理，并通过键获取片段（作为对象）。

m.get("c8y_SignalStrength")