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Design and Analysis of RPL Objective Functions

The IoT applications implement the Routing protocol for low-power and lossy networks, RPLs in the routing layer. The RPL protocol connects IoT devices through multihop paths to the root node, responsible for collecting and distributing the sensed data. The RPL accounts for Objective Functions (OFs) to construct the Destination Oriented Directed Acyclic Graph (DODAG) to the root node. The OF optimizes the route to the destination in the perspective of communication reliability, energy conservation, or security. The OF accounts for the metrics of Packet Delivery Ratio (PDR), the Expected Transmission Count (ETX), remaining energy, and security-related metrics separately or combinedly to select the best parent towards the root. It is imperative to design reliable and secure OFs for RPL for IoT networks.