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We describe the design and implementation of Savia, a sensor network system for measuring the sap flow of eucalyptus trees. Unlike prior sensor network systems, which generally take a vertically integrated approach and build everything from scratch, Savia is built out of several existing sensor systems. The difficulties we encountered when combining these systems demonstrate why a vertically integrated approach is more common. Based on our experiences composing Savia, we suggest two key abstractions that an OS should provide in order to allow sensor networks to grow beyond the current approach of writing everything from scratch.

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