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How does localsend work exactly? I've read both their website and Github README as well as part of their protocol docs but I still have no idea. How does the initial device discovery work? For file transfer does it use the local wifi, some external server, …?

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It looks like they implement something similar to Bonjour [1] using multicast DNS [2]. Not sure if it's basically a reimplementation like Avahi [3] or if it's a slightly different protocol (only skimmed the code [4] briefly).

[1]: https://en.m.wikipedia.org/wiki/Bonjour_(software)

[2]: https://en.m.wikipedia.org/wiki/Multicast_DNS

[3]: https://en.m.wikipedia.org/wiki/Avahi_(software)

[4]: https://github.com/localsend/localsend/tree/main/app/lib/pro...

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