This document summarizes a research project exploring intelligent and secure networks for urban Internet of Things applications at city scale. The project has three main research themes: the billion device challenge, citizen engagement, and creating sustainable ecosystems. The billion device challenge involves research on power management, adaptive radio communications, and resource orchestration for large-scale IoT deployments. Citizen engagement examines how to involve citizens as data providers and consumers. Creating sustainable ecosystems looks at performance analysis of IoT technologies and requirements for data sharing across stakeholders. The project is a collaboration between Intel, UCL, Imperial College London, and Future Cities Catapult.