ST STM32L4 Manual page 155

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IoT Hub provides three options for device apps to expose functionality to a
back-end app:
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Direct methods
Direct methods are often used for interactive control of devices such as turning on a fan.
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Twin's desired properties
certain desired state. For example, set the telemetry send interval to 30 minutes.
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Cloud-to-device messages
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In this lab you will learn how to send cloud-to-device messages from your
IoT Hub to your device kit using the
custom functions activated by specific messages (for example, to turn on/off
an LED on the IoT Dk board)
for communications that require immediate confirmation of the result.
for long-running commands intended to put the device into a
for one-way notifications to the device app.
Introduction
Azure Portal, and how to implement
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