What is the purpose of interface definitions in a device template?

The purpose of interface definitions in a device template is to specify the model and communication protocols that the device will use to interact with the IoT solution. This includes defining the data structure and formats for telemetry, properties, and commands that can be sent to and from the device. By outlining these parameters, interface definitions ensure compatibility between devices and the cloud solution, facilitating efficient communication and successful integration within Azure IoT Hub and related services.

The interface definitions play a critical role in identifying how devices should behave and what data they can generate, thereby helping developers to configure, simulate, and monitor IoT devices effectively. This organization is essential for building robust IoT applications that can handle multiple device types and ensure they communicate accurately with each other.