This link contains Create and read IoT Hub messages of azure.
I'm confused about app property and message property.
What's the difference between them?
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1 Answers
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The list of system properties is predetermined - in some cases the values are not user settable. Typically, system properties are used by IoT Hub as part of IoT Hub's standard message processing. You can create and set any application properties for your own purposes - application properties may be used as part of any custom routing rules you create in your hub. You may also want to use your custom application properties in any downstream D2C message processing in your solution.
An example of a system property is iothub-connection-device-id - this property is set by IoT Hub on every D2C message. This property contains the id of the device that sent the message and cannot be changed.
An example of an application property might be severity. You could then use the values (such as info, warning, and error) to route messages to different endpoints.
