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Wireless Sensor Networks (WSNs) play a major role in the expansion of theInternet of Things (IoT) market as they allow the deployment of low cost andlow power networks possibly in large areas. The introduction of the 6LoWPANstandard allowed WSN to move into the IPv6 era, with a seamless integration ofsensors into external networks. The recent application of IoT in industrialsystems is now introducing new traffic patterns - machine to machine (M2M)above the others - and communication challenges that can modify the classicalmultipoint-to-point pattern of WSN, having the sink as the root of everycommunication. To solve these problems, we propose an architecture to enable anefficient and controlled multi-hop forwarding over 6LoWPANs. We base ourapproach on the standard 6LoWPAN protocol stack and we exploit the SoftwareDefined Networking paradigm to achieve network reconfigurability. We evaluatethe performance of our architecture in a simulated environment, with bothmultipoint-to-point and M2M traffic, and we demonstrate its feasibility in areal testbed.

Enabling Multi-hop Forwarding in 6LoWPANs through Software-Defined Networking