Abstract: The utilization of domain-specific programming abstractions for wireless sensor actor networks can greatly ease applica- tion development. A high level of abstraction from under- lying system complexity fosters fast prototyping and less erroneous source code. However, especially in this domain access to low-level parameters can be mandatory to allow for sophisticated application fine-tuning. In this paper, we present a layered system access interface we developed for our middleware platform FACTS to address this challenge. Context-based configuration and control of system-level resources is facilitated by relying on lean ad- ditions to the FACTS framework. These will be discussed with the help of a common use case to illustrate the simple, yet powerful abstraction provided.
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