The download functionality shouldn't be that much effort, as long as you don't go into partial file sharing: Just a simple HTTP 1.1 request to

http:// IP:PORT/uri-res/N2R?urn:sha1:SHA1_HASH_IN_BASE32_UPPERCASE

Since you should already know the sha1 hashes of the files of others, this would make your client functional at once

PS: Which two free projects do you work on?

PPS: Congratulation!

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