Methods and apparatus, including computer program products, for real-time data transfer between sensor or actuator devices and higher-level applications.In one aspect, an integration engine receives a set of rules from an external application and receives item data including item identifiers from one or more tag readers, each item identifier being read from a digital tag bound to a physical item. The integration engine uses the rules and item data to determine in real time which subset of the item data to furnish to the external application.In another aspect, the integration engine receives from the external application configuration data for controlling an actuator device. The integration engine converts the configuration data to a format compatible with the actuator device; and furnishes the converted configuration data in real time to the actuator device.