Open Connectivity Foundation (OCF) is a standards organization that develops application-layer IoT protocols, based on the universally supported Internet Protocol (IP), using strong open standards. IoTivity is the open-source reference implementation of the OCF specification. IoTivity provides a framework for device discovery, onboarding, end-to-end security (and optionally, data models), for device-to-device, device-to-cloud and cloud-cloud connectivity. OCF is published as a ISO/IEC specification, and there is a comprehensive certification program in place.