What characterizes a writable property in IoT Central?

A writable property in IoT Central is designed to facilitate interaction between the cloud and the devices. The characteristic that defines this property is that it can be written by IoT Central and subsequently picked up by the device app. This means that the IoT Central application can send updates or commands to the device, allowing for real-time adjustments and configurations based on user preferences or automated processes.

This bidirectional nature enhances the functionality and usability of IoT solutions by enabling an operational flow where the cloud can actively influence device behavior. For instance, through cloud commands, IoT Central can change device settings or trigger actions based on data collected from other devices or cloud metrics.

Other options describe characteristics that do not align with how writable properties function in IoT Central. For example, option A incorrectly suggests that only the device app can set the writable property, which contradicts the primary definition. Option C states that the property becomes immutable once assigned, which goes against the nature of a writable property that allows for changes over time. Finally, option D implies a restrictive format for inputting values, which isn't a characteristic of writable properties; instead, they accept a range of values defined by the device capabilities and requirements.