It is what IPFS is built with, essentially they built out IPFS and made everything modular. It is being used in a lot of blockchain projects since it is so easy

It is what IPFS is built with, essentially they built out IPFS and made everything modular. It is being used in a lot of blockchain projects since it is so easy to develop with and write your own protocols. Developing with the library essentially comes down to protobuf serialization logic inside a router with the path being the name of your protocol, just like you would in rails or node, everything else is handled by the library. To talk to a peer over your protocol you just need their address on the network (public key), your protocol name and to serialize your protobuf data to be written over the network, the libraries handle dialing/routing through connected peers if its not possible to directly connect to the peer.