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Flooding protocols based on concurrent transmissions are regarded as the mostreliable way to collect or disseminate data across a multi-hop low-powerwireless mesh network. Recent works have shown that such protocols areeffective for narrowband communication not only over IEEE 802.15.4, but alsoover the BLE 5 physical layers (PHYs). However, to date, existing literaturehas only built synchronous flooding solutions on top of a single PHY, and therehas been no attempt to leverage different PHYs at runtime to increaseperformance. This paper fills this gap and presents OSF, an open-sourceframework that enables the design of multi-PHY synchronous flooding solutionsthanks to a novel radio driver and middle-ware architecture capable ofdynamically switching the underlying physical layer. This allows exploitationof the specific benefits of each PHY (e.g., higher data-rate, increasedrobustness) on-demand during each flood, increasing performance. We tailor OSFto the off-the-shelf nRF52840 platform, and showcase its benefits by comparingsingle-PHY and multi-PHY synchronous flooding solutions on a real-worldtestbed.

OSF: An Open-Source Framework for Synchronous Flooding over Multiple Physical Layers