Table 1: Comparison with other surveys on the basis of topics covered.

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, energyVarious architectures of IoT