would it be possible to have discovery server discovery server, with the possibility of the client also became discovery servidor? if possible would it be interesting ?

Are you asking whether the normal Syncthing client / binary could also be a discovery server? Currently, no, and with the current discovery protocol I don’t think it makes sense. However, there could be a future peer-to-peer discovery protocol, and then it would make sense.

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Exactly, has anyone come to discuss any p2p protocol?

Not that I’ve heard.

What do you think of Webrtc?

it may be possible to do through text file. An alternative could be to create SQLite