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Sensors 2015, 15(1), 1217-1244; doi:10.3390/s150101217

A Proxy Design to Leverage the Interconnection of CoAP Wireless Sensor Networks with Web Applications

1
Wireless Network Group (WNG), Department of Telematics Engineering, Universitat Politècnica de Catalunya, C/Jordi Girona 1-3, Mòdul C3, Barcelona 08034, Spain
2
CAT Foundation, Gran Capità 2-4 (Nexus Building), Barcelona 08034, Spain
*
Author to whom correspondence should be addressed.
Received: 17 November 2014 / Accepted: 23 December 2014 / Published: 9 January 2015
(This article belongs to the Special Issue Sensors and Smart Cities)
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Abstract

In this paper, we present the design of a Constrained Application Protocol (CoAP) proxy able to interconnect Web applications based on Hypertext Transfer Protocol (HTTP) and WebSocket with CoAP based Wireless Sensor Networks. Sensor networks are commonly used to monitor and control physical objects or environments. Smart Cities represent applications of such a nature. Wireless Sensor Networks gather data from their surroundings and send them to a remote application. This data flow may be short or long lived. The traditional HTTP long-polling used by Web applications may not be adequate in long-term communications. To overcome this problem, we include the WebSocket protocol in the design of the CoAP proxy. We evaluate the performance of the CoAP proxy in terms of latency and memory consumption. The tests consider long and short-lived communications. In both cases, we evaluate the performance obtained by the CoAP proxy according to the use of WebSocket and HTTP long-polling. View Full-Text
Keywords: CoAP; WSNs; WoT; Smart Cities; 6LoWPAN; HTTP long-polling; low energy; WebSocket CoAP; WSNs; WoT; Smart Cities; 6LoWPAN; HTTP long-polling; low energy; WebSocket
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

Ludovici, A.; Calveras, A. A Proxy Design to Leverage the Interconnection of CoAP Wireless Sensor Networks with Web Applications. Sensors 2015, 15, 1217-1244.

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