Add more output

ping_server/main.go

@@ -28,7 +28,8 @@ func Reverse(s string) string {
 }
 
 func (s *server) Ping(ctx context.Context, req *pb.PingRequest) (*pb.PingResponse, error) {
-	log.Printf("Received: %v", req.Data)
+	log.Printf("Received: %v seq=%d", req.Data, req.Seq)
+	log.Printf("Sent: %v seq=%d", Reverse(req.Data), req.Seq)
 	return &pb.PingResponse{Data: Reverse(req.Data), Seq: req.Seq}, nil
 }