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The emergence of low-power wide area networks (LPWANs) as a new agent in theInternet of Things (IoT) will result in the incorporation into the digitalworld of low-automated processes from a wide variety of sectors. The single-hopconception of typical LPWAN deployments, though simple and robust, overlooksthe self-organization capabilities of network devices, suffers from lack ofscalability in crowded scenarios, and pays little attention to energyconsumption. Aimed to take the most out of devices' capabilities, the HAREprotocol stack is proposed in this paper as a new LPWAN technology flexibleenough to adopt uplink multi-hop communications when proving energetically moreefficient. In this way, results from a real testbed show energy savings of upto 15% when using a multi-hop approach while keeping the same networkreliability. System's self-organizing capability and resilience have been alsovalidated after performing numerous iterations of the association mechanism anddeliberately switching off network devices.

HARE: Supporting efficient uplink multi-hop communications in self-organizing LPWANs