| | Survey paper | Sensors | Fog computing | Middleware | Communication | Applications | Other |
| | “Internet of Things: A Survey,” Atzori et al., 2010 | RFID | Not covered | Service oriented architecture | Communication standards, IEEE 802.15.4, WSN, Zigbee, 6LoWPAN, NFC, Wireless Hart, M2M, EPC global, ROLL routing | Smart home, health, logistics, transport, agriculture, social, environment | Issues related to security, privacy, naming, addressing |
| | “Internet of Things (IoT): A Vision, Architectural Elements, and Future Directions,” Gubbi et al., 2013 | RFID | Not covered | Service oriented architecture | WSN, addressing schemes | Personal and home, enterprise, utilities, mobile | Cloud centric IoT |
| | “The Internet of Things—A Survey of Topics and Trends,” Whitmore et al., 2014 | RFID | Not covered | Semantic middleware | WSN, NFC, WSN | Smart infrastructure, health care, supply chains/logistics | Security and plrivacy |
| | Our survey | Covered various types of sensors: environmental, medical, neural, chemical, infrared, mobile phone sensors, RFID | Fog computing/smart gateway layered architecture of IoT | Issues addressed by middleware, types of middleware: event based, service based, semantic, database, application specific | All layers of IP stack, protocols and standards of each layer, IEEE 802.15.4, 6LoWPAN, NFC, ROLL routing, COAP, MQTT, LPWAN, low energy wireless communication technologies: BLE, Zigbee, RFID-WSN integration | Smart home, health, logistics, transport, social, environment, agriculture, energy | Various architectures of IoT |
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