echo_pb.proto

syntax="proto2";

message EchoRequest {
	required string message = 1;
	required string name = 2;
};

message EchoResponse {
	required string message = 1;
	optional int32 state = 2;
	optional int32 error = 3;
};

service Example {
	rpc Echo(EchoRequest) returns (EchoResponse);
};