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An important part of the foreseen Internet of Things consists in wireless sensor networks running adapted IPv6 protocols. Since the way sensors are scattered is generally unplanned and may evolve with time, a routing protocol is needed in order to provide paths across such networks. Efforts towards standardizing RPL, a routing protocol targeting sensor networks, have thus recently taken place. This paper analyzes some fundamental tradeoffs inherent to RPL, which enables the protocol to require smaller routing state than most other routing protocols. However, these tradeoffs are on the other hand an issue in several Home and Building Automation use-cases, which require sensor to sensor communication - aside of communication from sensor to sink.
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