The GitHub README page doesn't give many details, but for what I've seen in the (slightly blurry) screenshot, what this software does is spin up a DNS server on

The GitHub README page doesn't give many details, but for what I've seen in the (slightly blurry) screenshot, what this software does is spin up a DNS server on a given host, and then allow transferring a file to it by sending multiple DNS A requests for names containing parts of the Base64 representation of the file to that DNS server.