Godobuf is a Google Protocol buffers compiler from .proto-file description to GDScript output file. Output file contains user protobuf messages represented by classes and protobuf core code which responsible for data serialization/deserialization. Godobuf used as plugin for Godot v3.0.x
Godobuf is easy to use, does not require rebuilding the Godot, because it is written in GDScript. All you need is to start the plugin.