Pluggable real world interfaces Physically enabled code deployment for networked sensors

In this paper we present a novel abstraction and deployment process using real world interfaces, which reflect the realities of pervasive software development. Pluggable real world interfaces support ldquoplugpsilanpsilaplayrdquo deployment for sensor-augmented hardware and provide an object-oriented encapsulation of high-level contextual interfaces. The architecture adds an additional object based abstraction layer between the sensor subsystem (delivering e.g. cues) and the application (delivering the situation context). Component abstraction layers are implemented as code that comes with physical components, e.g. a chair, and provides the functionality for detecting context bundled with the sensory hardware. The approach will lead to pluggable real world interfaces: The functionality of an appliance will be composed from the functionality of its components - just like a meeting room will be composed from many chairs. This paper will present concept, architecture and a first implementation based on a Java run-time system for very tiny, very low-power embedded sensor nodes.