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Mobile Information Systems
Volume 2016 (2016), Article ID 4015625, 11 pages
http://dx.doi.org/10.1155/2016/4015625
Research Article

Improving MQTT Data Delivery in Mobile Scenarios: Results from a Realistic Testbed

1Department of Computer Engineering, Universitat Politècnica de València, Camí de Vera, s/n, 46022 València, Spain
2Universitat Jaume I, Castelló de la Plana, Avenida de Vicent Sos Baynat, s/n, 12071 Castelló, Spain

Received 5 February 2016; Accepted 11 July 2016

Academic Editor: Wenfeng Li

Copyright © 2016 Jorge E. Luzuriaga et al. 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.

Abstract

MQTT is being widely used for data delivery in IoT applications but its architecture does not properly handle mobility when disconnection periods tend to be large. In this paper we describe an experimental evaluation, made in a real environment, of a solution that guarantees that there is no information loss when variable length hand-offs appear due to the movement of a node. Our proposal modifies the classical publish/subscribe scheme by introducing an intermediate buffer that takes care of message transfer. Finally, we study the impact related to the connectivity of mobile devices of the use of the standard Linux Network Manager. We propose a cross-layer solution that improves the device connectivity in conjunction with the data layer management. We show that our solution improves the data delivery guaranteeing that no information is lost.