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Open AccessArticle

Experimental Evaluation of Unicast and Multicast CoAP Group Communication

1
Said Khoury IT Center of Excellence (SKITCE), Al-Quds University, Abu Deis, Jerusalem 51000, Palestine
2
Ghent University—iMinds, Department of Information Technology (INTEC), Technologiepark-Zwijnaarde 15, 9052 Ghent, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Sensors 2016, 16(7), 1137; https://doi.org/10.3390/s16071137
Received: 20 March 2016 / Revised: 20 June 2016 / Accepted: 9 July 2016 / Published: 21 July 2016
(This article belongs to the Special Issue Intelligent Internet of Things (IoT) Networks)
The Internet of Things (IoT) is expanding rapidly to new domains in which embedded devices play a key role and gradually outnumber traditionally-connected devices. These devices are often constrained in their resources and are thus unable to run standard Internet protocols. The Constrained Application Protocol (CoAP) is a new alternative standard protocol that implements the same principals as the Hypertext Transfer Protocol (HTTP), but is tailored towards constrained devices. In many IoT application domains, devices need to be addressed in groups in addition to being addressable individually. Two main approaches are currently being proposed in the IoT community for CoAP-based group communication. The main difference between the two approaches lies in the underlying communication type: multicast versus unicast. In this article, we experimentally evaluate those two approaches using two wireless sensor testbeds and under different test conditions. We highlight the pros and cons of each of them and propose combining these approaches in a hybrid solution to better suit certain use case requirements. Additionally, we provide a solution for multicast-based group membership management using CoAP. View Full-Text
Keywords: wireless sensor networks; Internet of Things; CoAP; sensors; group communication; multicast; entities wireless sensor networks; Internet of Things; CoAP; sensors; group communication; multicast; entities
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MDPI and ACS Style

Ishaq, I.; Hoebeke, J.; Moerman, I.; Demeester, P. Experimental Evaluation of Unicast and Multicast CoAP Group Communication. Sensors 2016, 16, 1137.

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