Microsoft Certified: Azure IoT Developer Specialty (AZ-220) Practice Test 2025 – The Complete All-in-One Guide to Exam Success!

A heartbeat in the context of IoT telemetry is utilized to send regular updates about the device's health and status to a central system or cloud service. This mechanism ensures that the device is functioning correctly and is connected to the network. It serves as a periodic signal that provides information regarding the operational status of the device, helping to detect potential issues early on.

In IoT systems, maintaining connectivity and operational awareness of devices is crucial. By sending heartbeats, devices communicate their current state, allowing for proactive monitoring and management. This is essential for applications where immediate action may be needed if a device goes offline or exhibits irregular behavior.

Other choices focus on different aspects of device management. While errors reported from the device pertain to specific failure messages, a unique device ID is crucial for identifying each device, and firmware version pertains to the software running on a device rather than its health. The heartbeat specifically encapsulates the ongoing health status of the device rather than these other elements.