Creation Time UTC not exposed in device client SDK Message class

[larrype]

• OS and version used: Windows 10, Android API 27

• Java runtime used: 1.8.0_181

• SDK version used: 1.14.1

Description of the issue:

We have a situation where the device will be offline for extended periods of time but during this time telemetry messages will be accumulated and be batched until connected to iot hub. It seems from the documentation https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-messages-construct that the iothub-creation-time-utc provides a way to set this in the message but it does not appear to be exposed in the java SDK.

A related issue with more information was logged in the csharp SDK project https://github.com/Azure/azure-iot-sdk-csharp/issues/376

Code sample exhibiting the issue:

Not Applicable

Console log of the issue:

Not Applicable

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[anhashia]

Supported in IoT C# SDK
https://github.com/Azure/azure-iot-sdk-csharp/blob/master/iothub/device/src/MessageSystemPropertyNames.cs#L36

[anhashia]

Azure/azure-iot-sdk-csharp#376 @yzhong94 as fyi !

[timtay-microsoft]

We are working on lighting up this feature now

[jasmineymlo]

fixed in https://github.com/Azure/azure-iot-sdk-java/releases/tag/2019-4-5

[az-iot-builder-01]

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