Look in http://www.bchainledger.com/2017/04/under-construction-hyperledger-fabric.html 



From:        "Aleksandr Kochetkov" <aleksandr.kochetkov@...>
To:        fabric@...
Date:        12/03/2019 12:46 PM
Subject:        [EXTERNAL] Re: [Hyperledger Fabric] Where i can find documentation about HL-Fabric protobufs structure and GRPC communications between nodes? #fabric #grpc #network
Sent by:        fabric@...

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Thanks for bringing this repo into conversion Yacov!
As we can see from repo, there are a lot of protobufs, sometimes one utilizes another as payload/data etc. That exactly the reason why i'm asking for documentation, which would explain how all this protobufs are connected and used in Fabric.