December update for Azure IoT Edge

The December update of Azure IoT Edge includes the following improvements:

• You can now write modules in C by using the C client SDK.
• Azure IoT Edge features are now available in national clouds.

IoT Edge runtime improvements:

• We fixed a bug that prevented the edge hub from multiplexing connections between an edge device and Azure IoT Hub.
• Communication with IoT Hub falls back to AMQP over WebSockets if AMQP port 5671 is blocked.
• Messages that have not been delivered to the cloud due to a temporary internet connection are now persisted to storage Azure Resource Manager devices.
• Deployments with critical errors can fail instead of retrying forever.
• We added support for WSL.

Azure portal fixes specific to IoT Edge:

• We added advanced settings to allow customers to override the edge agent image, edge hub image, and storeAndForwardConfiguration timeToLiveSecs value.
• We fixed a bug that prevented many special characters from being used in the target condition of a deployment.
• We added the deployment status for the modules: pending deployment, pending modification, pending removal, and deployed.

Documentation:

• We added a troubleshooting guide.
• We added an article on how to migrate from V1 to V2.
• We updated target condition syntax.
• We updated the Deploy Azure Machine Learning tutorial to show how to build a machine learning model.

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