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IoT aims to improve our daily lives by seamlessly integrating heterogeneous devices into the physical space around us through a digital ecosystem of sensor data, communications, analytics, and semi-automated actions. Our exploratory proof-of-concept IoT system, SCALE, motivated our research challenges and served as a testbed for deploying our proposed approach. In particular, we identified the critical need for IoT data exchange: an event-driven pattern using producer-consumer abstractions to connect many heterogeneous devices, services, and users. This provides a seamless communications fabric for large-scale networks of heterogeneous resource-constrained devices. IoT deployments keep system deployment costs and complexity low by off-loading much of the logic to the cloud. Hence, data exchange manages the flow of application-supporting messages in order to gather data at the network edge …