1.Save "real" response body from Charles to file
2.Turn on Map Remote tool in Charles
3.Start local server
java -jar mock.jar -p <port> (optional, default 8080) -m <Protobuf message full type name> -f <file> -d <Descriptor file 1> .. <Descriptor file N>
Example:
java -jar ./out/artifacts/mock_jar/mock.jar -m bidmachine.protobuf.openrtb.Openrtb -f bidmachine.protobuf.openrtb.Openrtb.json -d bidmachine.desc google.desc