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Clarification on Whether Acknowledgment Messages Count Towards Azure IoT Hub Daily Message Quota

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ACK Daily Message Quota

Jordan Reyes Leger 0 Reputation points Microsoft Employee
2025-03-06T23:12:59.45+00:00

Hello Azure Support Team,

I am seeking clarification regarding the Azure IoT Hub's daily message quota, specifically concerning acknowledgment messages.

In our current setup, we utilize cloud-to-device messaging and request delivery acknowledgments for each message sent. We would like to understand whether these acknowledgment messages are counted against our IoT Hub's daily message quota.​learn.microsoft.com

The official documentation outlines the operations that contribute to the daily message quota, such as device-to-cloud telemetry messages and cloud-to-device messages. However, it does not explicitly state whether acknowledgment messages, generated upon setting the 'Ack' property in cloud-to-device messages, are included in this count.​

Could you please confirm if acknowledgment messages are considered part of the daily message quota? Additionally, if they are included, could you provide guidance on how they are measured and any best practices to manage their impact on the quota?

Thank you for your assistance.

Best regards,

Azure IoT Hub
Azure IoT Hub
An Azure service that enables bidirectional communication between internet of things (IoT) devices and applications.
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