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Sensors 2016, 16(10), 1560; doi:10.3390/s16101560

Gateway-Assisted Retransmission for Lightweight and Reliable IoT Communications

Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan 701, Taiwan
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Author to whom correspondence should be addressed.
Academic Editors: Massimo Poncino and Ka Lok Man
Received: 28 May 2016 / Revised: 14 September 2016 / Accepted: 20 September 2016 / Published: 22 September 2016
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Abstract

Message Queuing Telemetry Transport for Sensor Networks (MQTT-SN) and Constrained Application Protocol (CoAP) are two protocols supporting publish/subscribe models for IoT devices to publish messages to interested subscribers. Retransmission mechanisms are introduced to compensate for the lack of data reliability. If the device does not receive the acknowledgement (ACK) before retransmission timeout (RTO) expires, the device will retransmit data. Setting an appropriate RTO is important because the delay may be large or retransmission may be too frequent when the RTO is inappropriate. We propose a Gateway-assisted CoAP (GaCoAP) to dynamically compute RTO for devices. Simulation models are proposed to investigate the performance of GaCoAP compared with four other methods. The experiment results show that GaCoAP is more suitable for IoT devices. View Full-Text
Keywords: Constrained Application Protocol (CoAP); Internet of Things (IoT); Message Queuing Telemetry Transport for Sensor Networks (MQTT-SN); retransmission mechanism; retransmission timeout (RTO); round-trip time (RTT) Constrained Application Protocol (CoAP); Internet of Things (IoT); Message Queuing Telemetry Transport for Sensor Networks (MQTT-SN); retransmission mechanism; retransmission timeout (RTO); round-trip time (RTT)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chang, H.-L.; Wang, C.-G.; Wu, M.-T.; Tsai, M.-H.; Lin, C.-Y. Gateway-Assisted Retransmission for Lightweight and Reliable IoT Communications. Sensors 2016, 16, 1560.

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