make proto
go run server/main.go
go run client/main.go
Then it returns the following messages.
2017/11/14 14:52:10 send message: tokyo
2017/11/14 14:52:10 send message: 001
2017/11/14 14:52:10 send message: Japan
2017/11/14 14:52:10 received message: TOKYO
2017/11/14 14:52:10 received message: 001
2017/11/14 14:52:10 received message: JAPAN