This repository hosts the artifacts accompanying our NSDI 2021 paper, which introduces FIND and FLYNC. FIND is the first neighbor discovery protocol for battery-free networks; it uses randomized waiting to minimize discovery latency in the face of intermittency. FLYNC synchronizes indoor light harvesting devices to the powerline-induced brightness variations of state-of-the-art lamps; it further speeds up discovery when used in tandem with FIND.

In addition to the Python implementation of the analytical FIND model, we provide the hardware design of the prototype battery-free node and the source code of the firmware we used to evaluate FIND and FLYNC.

To get an overview, visit our website. For a detailed description and evaluation results, take a look at our paper.

We provide a Python implementation of the analytical model of the FIND protocol, allowing to reproduce key results of our paper. For a detailed description and examples, check out the /model directory.

We built a tiny, battery-free wireless node to evaluate FIND and FLYNC on real hardware. The /hardware directory contains the corresponding schematics and layout files.

The C code in the /firmware directory implements the FIND protocol and the FLYNC synchronization mechanism on our prototype battery-free node.

FIND and FLYNC are being developed at the Networked Embedded Systems Lab at TU Dresden.

The main contributors are:

• Kai Geissdoerfer
• Marco Zimmerling