Edinburgh Napier University

  The adoption of WSN and IEEE 802.15.4 standard for the linear WSN networks were assumed. The interconnection of WSNs with the Internet is possible by assigning IPv6 addresses to low- power devices. The 6LoWPAN adaption layer enables the IPv6 addresses assignment with low levels of overhead. To facilitate maximum efficiency of WSN, integrated with IoT, the routing protocol RPL was developed to be compatible with 6LoWPAN networks. The main contribution of this paper is on identifying problems at the level of routing in WSN, and a study of specific metrics used to calculate the forwarding cost between nodes in a Multi Segment Linear Pipeline Mentoring WSNs. The RPL protocol was implemented on OMNeT++ simulator with the objective of analysing the behaviors of ETX, HOP-COUNT and RSSI routing metrics. ETX achieved the best results in all results, while RSSI has shown poor results. However, HOP-COUNT, has shown good results in terms of routing stability with fast convergence and lower delay.