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. 2017 Jan 14;17(1):156. doi: 10.3390/s17010156

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© 2017 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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An example of the Gappa protocol [59]. A circle denotes a sensor node while a rectangular over(or below) a circle denotes the received pages of that node. An arrowed edge from $N 1$ to $N 2$ denotes that $N 2$ receives a REQ message from $N 1$ . A rectangular besides an arrowed edge indicates the requested page number.