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Over-the-air update
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=== Internet of things (IoT) === More recently, with the new concepts of [[Wireless Sensor Networks]] and the [[Internet of Things]] (IoT), where the networks consist of hundreds or thousands of nodes, OTA is taken to a new direction: for the first time OTA is applied using unlicensed frequency bands (868 MHz, 900 MHz, 2400 MHz) and with low consumption and low data rate transmission using protocols such as [[802.15.4]] and [[Zigbee]].<ref>{{Cite web |last=Gascón |first=David |author2=Alberto Bielsa |author3=Félix Genicio |author4=Marcos Yarza |date=9 May 2011 |title=Over the Air programming with 802.15.4 and ZigBee - OTA |url=http://www.Libelium.com/over_the_air_programming_OTA_802.15.4_ZigBee/ |access-date=28 May 2012 |website=www.Libelium.com |publisher=[[Libelium]]}}</ref> [[Sensor node]]s are often located in places that are either remote or difficult to access. As an example, [[Libelium]] has implemented an OTA programming system for Zigbee WSN devices. This system enables [[firmware]] upgrades without the need of physical access, saving time and money if the nodes must be re-programmed.<ref>{{Cite web |date=2 May 2012 |title=Libelium.com 50 Sensor applications for a smarter world. Get inspired! |url=http://www.Libelium.com/50_sensor_applications |access-date=28 May 2012 |website=www.Libelium.com |publisher=[[Libelium]]}}</ref>
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