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Several IoT testbeds have been designed to test and push the performance of low-power wireless networking protocols to the limit. However, they mostly target low-power wireless systems operating in isolation, and are unable to precisely characterize the performance of solutions operating across multiple sites or interacting with cloud resources. As advances in backbone communication networks allow to move towards decentralized IoT deployments, there is a growing need to understand the impact of the Internet on the timeliness and reliability of end-to-end communications. In this poster, we outline the necessary steps to evolve D-Cube, a full-fledged benchmarking infrastructure, into a federated testbed capable of measuring the performance of low-power wireless systems operating across multiple sites through the Internet, thereby enabling research on the next-generation IoT systems operating on a mesh-cloud continuum.