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Exam AZ-220 topic 2 question 19 discussion

Actual exam question from Microsoft's AZ-220
Question #: 19
Topic #: 2
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Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
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You have a Standard tier Azure IoT hub and a fleet of IoT devices.
The devices connect to the IoT hub by using either Message Queuing Telemetry Transport (MQTT) or Advanced Message Queuing Protocol (AMQP).
You need to send data to the IoT devices and each device must respond. Each device will require three minutes to process the data and respond.
Solution: You update the twin desired property and check the corresponding reported property.
Does this meet the goal?

  • A. Yes
  • B. No
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Suggested Answer: A 🗳️
IoT Hub provides three options for device apps to expose functionality to a back-end app:
✑ Twin's desired properties for long-running commands intended to put the device into a certain desired state. For example, set the telemetry send interval to 30 minutes.
✑ Direct methods for communications that require immediate confirmation of the result. Direct methods are often used for interactive control of devices such as turning on a fan.
✑ Cloud-to-device messages for one-way notifications to the device app.
Reference:
https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-c2d-guidance

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Ashwinee
Highly Voted 4 years, 1 month ago
Each device will require three minutes to process the data and respond. hence twin properties is correct
upvoted 7 times
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Momindo
Most Recent 2 years, 7 months ago
why would you "send data" using device twin properties, device twins are made for configurations right?
upvoted 1 times
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Ouss7
2 years, 9 months ago
twin's desired properties are one-way communication
upvoted 1 times
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