Drivers Behind New Network ArchitecturesScaleSecurityConstrained Devices and NetworksDataLegacy Device SupportComparing IoT ArchitecturesThe oneM2M IoT Standardized ArchitectureThe IoT World Forum (IoTWF) Standardized ArchitectureAdditional IoT Reference ModelsA Simplified IoT ArchitectureThe Core IoT Functional StackLayer 1: Things: Sensors and Actuators LayerLayer 2: Communications Network LayerLayer 3: Applications and Analytics LayerIoT Data Management and Compute StackFog ComputingEdge ComputingThe Hierarchy of Edge, Fog, and CloudSummaryReferences