What does the acronym C2D in IoT metrics refer to?

C2D in IoT metrics stands for "Cloud to Device." This term describes a communication pathway in IoT systems where data and commands are sent from the cloud back to edge devices or sensors. The emphasis on this direction of communication highlights the interactions where the cloud platform can send instructions, updates, or configuration settings to devices in the field, enabling remote management and operational control.

This concept is essential for scenarios where the cloud needs to push changes or data to devices, such as sending firmware updates, modifying device configurations, or initiating actions based on data processing that occurred in the cloud. The ability of cloud services to communicate with devices enhances the functionality of IoT systems, improving their responsiveness and adaptability in real-time applications.

The other options do not accurately describe the communication dynamics in IoT systems. "Cloud to Data" would imply a transfer of data without specifying the interaction with devices, while "Cost to Device" and "Cost to Data" introduce concepts that do not relate to the established terminology in IoT communications.