diff --git a/go.mod b/go.mod
index 5acbfe7..23b99e3 100644
--- a/go.mod
+++ b/go.mod
@@ -2,9 +2,6 @@ module git.godopu.net/lab/etri-smartfarm-poc-controller-serial
 
 go 1.17
 
-require (
-	github.com/jacobsa/go-serial v0.0.0-20180131005756-15cf729a72d4
-	github.com/rjeczalik/notify v0.9.2
-)
+require github.com/rjeczalik/notify v0.9.2
 
 require golang.org/x/sys v0.0.0-20180926160741-c2ed4eda69e7 // indirect
diff --git a/go.sum b/go.sum
index b252394..aedd95f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,3 @@
-github.com/jacobsa/go-serial v0.0.0-20180131005756-15cf729a72d4 h1:G2ztCwXov8mRvP0ZfjE6nAlaCX2XbykaeHdbT6KwDz0=
-github.com/jacobsa/go-serial v0.0.0-20180131005756-15cf729a72d4/go.mod h1:2RvX5ZjVtsznNZPEt4xwJXNJrM3VTZoQf7V6gk0ysvs=
 github.com/rjeczalik/notify v0.9.2 h1:MiTWrPj55mNDHEiIX5YUSKefw/+lCQVoAFmD6oQm5w8=
 github.com/rjeczalik/notify v0.9.2/go.mod h1:aErll2f0sUX9PXZnVNyeiObbmTlk5jnMoCa4QEjJeqM=
 golang.org/x/sys v0.0.0-20180926160741-c2ed4eda69e7 h1:bit1t3mgdR35yN0cX0G8orgLtOuyL9Wqxa1mccLB0ig=
diff --git a/main.go b/main.go
index 4ef8c0a..6bf4fa5 100644
--- a/main.go
+++ b/main.go
@@ -1,177 +1,27 @@
-package main
+package manager
 
 import (
-	"bufio"
-	"encoding/json"
-	"errors"
+	"context"
 	"fmt"
-	"io/ioutil"
-	"log"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strconv"
-	"strings"
 	"time"
 
-	"github.com/jacobsa/go-serial/serial"
+	"git.godopu.net/lab/etri-smartfarm-poc-controller-serial/puserial"
 	"github.com/rjeczalik/notify"
 )
 
-func readJsonFromSerial(obj map[string]interface{}, decoder *json.Decoder) error {
-	err := decoder.Decode(&obj)
-	if err != nil {
-		return err
-	}
+func Run() {
+	fmt.Println("Hello world")
 
-	return nil
-}
+	ctx, _ := context.WithTimeout(context.Background(), time.Second*10)
+	ch_discover := make(chan notify.EventInfo)
+	go puserial.WatchNewDevice(ctx, ch_discover)
 
-func msgSender(did string) {
-
-}
-
-func initUSB() (string, error) {
-	fs, err := ioutil.ReadDir("/dev")
-	if err != nil {
-		return "", err
-	}
-
-	for _, f := range fs {
-		if strings.Contains(f.Name(), "ttyACM") {
-			return filepath.Join("/dev", f.Name()), nil
-		}
-	}
-
-	return "", errors.New("USB Not found")
-}
-
-func discoverUSB() string {
-	fmt.Println("Waiting USB")
-	ch := make(chan notify.EventInfo, 1)
-	if err := notify.Watch("/dev", ch, notify.Create, notify.Remove); err != nil {
-		log.Fatalln(err)
-	}
-	defer notify.Stop(ch)
-
-	for e := range ch {
-		if strings.Contains(e.Path(), "/dev/ttyACM") {
-			if e.Event() == notify.Create {
-				log.Println("Got event:", e.Path())
-				return e.Path()
-			}
-		}
-	}
-
-	return ""
-}
-
-func main() {
-	dev, err := initUSB()
-	if err != nil {
-		if err.Error() == "USB Not found" {
-			dev = discoverUSB()
-		} else {
-			log.Fatalln(err.Error())
-		}
-	}
-
-	fmt.Println("discover: ", dev)
-	time.Sleep(time.Second)
-
-	log.Println("changing the mod of file")
-	cmd := exec.Command("chmod", "a+rw", dev)
-	b, _ := cmd.CombinedOutput()
-	fmt.Println(string(b))
-
-	// Set up options.
-	options := serial.OpenOptions{
-		PortName:        dev,
-		BaudRate:        9600,
-		DataBits:        8,
-		StopBits:        1,
-		MinimumReadSize: 16,
-	}
-
-	// Open the port.
-	port, err := serial.Open(options)
-	if err != nil {
-		log.Fatalf("serial.Open: %v", err)
-	}
-
-	// Make sure to close it later.
-	defer port.Close()
-
-	// Write 4 bytes to the port.
-	// b := []byte{0x00, 0x01, 0x02, 0x03}
-	// n, err := port.Write(b)
-	// if err != nil {
-	// 	log.Fatalf("port.Write: %v", err)
-	// }
-
-	// fmt.Println("Wrote", n, "bytes.")
-	// var tokenByte string
-
-	reader := bufio.NewReader(port)
-	// decoder := json.NewDecoder(port)
-	encoder := json.NewEncoder(port)
-	command := map[string]interface{}{}
-	command["code"] = 1
-	command["light"] = 0
-
-	var data string
-	go func() {
-		for {
-			b, _, _ := reader.ReadLine()
-			recvObj := map[string]interface{}{}
-			err := json.Unmarshal(b, &recvObj)
-			// err = readJsonFromSerial(recvObj, decoder)
-			if err != nil {
-				if err.Error() == "EOF" {
-					return
-				}
-
-				fmt.Println("error: ", string(b))
-			}
-
-			data = string(b)
-			// fmt.Println("line : ", recvObj)
-		}
-	}()
-
-	cmdReader := bufio.NewReader(os.Stdin)
 	for {
-		fmt.Print("> ")
-		cmd, _, _ := cmdReader.ReadLine()
-		cmdTkns := strings.Split(string(cmd), " ")
-
-		if cmdTkns[0] == "light" {
-			command["code"] = 1
-			if cmdTkns[1] == "on" {
-				command["light"] = 100
-			} else {
-				command["light"] = 0
-			}
-		} else if cmdTkns[0] == "fan" {
-			command["code"] = 2
-			if cmdTkns[1] == "on" {
-				command["status"] = 1
-			} else {
-				command["status"] = 0
-			}
-		} else if cmdTkns[0] == "servo" {
-			command["code"] = 3
-			angle, err := strconv.Atoi(cmdTkns[1])
-			if err != nil {
-				continue
-			}
-			command["angle"] = angle
-		} else if cmdTkns[0] == "print" {
-			fmt.Println(data)
-		}
-		err := encoder.Encode(command)
-		if err != nil {
-			panic(err)
+		e, ok := <-ch_discover
+		if !ok {
+			fmt.Println("byebye~!")
+			return
 		}
+		fmt.Println(e)
 	}
 }
diff --git a/puserial/serial.go b/puserial/serial.go
index d959f92..30abaf5 100644
--- a/puserial/serial.go
+++ b/puserial/serial.go
@@ -1,164 +1,157 @@
-package serial
+package puserial
 
 import (
-	"bufio"
-	"encoding/json"
-	"errors"
+	"context"
 	"fmt"
-	"io/ioutil"
-	"log"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strconv"
 	"strings"
-	"time"
 
-	"github.com/jacobsa/go-serial/serial"
 	"github.com/rjeczalik/notify"
 )
 
-func DiscoverUSB() string {
-	fmt.Println("Waiting USB")
-	ch := make(chan notify.EventInfo, 1)
-	if err := notify.Watch("/dev", ch, notify.Create, notify.Remove); err != nil {
-		log.Fatalln(err)
+func WatchNewDevice(ctx context.Context, ch_discover chan<- notify.EventInfo) error {
+	defer close(ch_discover)
+
+	filter := make(chan notify.EventInfo, 1)
+	if err := notify.Watch("/dev", filter, notify.Create, notify.Remove); err != nil {
+		return err
 	}
-	defer notify.Stop(ch)
+	defer notify.Stop(filter)
 
-	for e := range ch {
-		if strings.Contains(e.Path(), "/dev/ttyACM") {
-			if e.Event() == notify.Create {
-				log.Println("Got event:", e.Path())
-				return e.Path()
-			}
-		}
-	}
-
-	return ""
-}
-
-func InitUSB() (string, error) {
-	fs, err := ioutil.ReadDir("/dev")
-	if err != nil {
-		return "", err
-	}
-
-	for _, f := range fs {
-		if strings.Contains(f.Name(), "ttyACM") {
-			return filepath.Join("/dev", f.Name()), nil
-		}
-	}
-
-	return "", errors.New("USB Not found")
-}
-
-func Run() {
-	dev, err := InitUSB()
-	if err != nil {
-		if err.Error() == "USB Not found" {
-			dev = DiscoverUSB()
-		} else {
-			log.Fatalln(err.Error())
-		}
-	}
-
-	fmt.Println("discover: ", dev)
-	time.Sleep(time.Second)
-
-	log.Println("changing the mod of file")
-	cmd := exec.Command("chmod", "a+rw", dev)
-	b, _ := cmd.CombinedOutput()
-	fmt.Println(string(b))
-
-	// Set up options.
-	options := serial.OpenOptions{
-		PortName:        dev,
-		BaudRate:        9600,
-		DataBits:        8,
-		StopBits:        1,
-		MinimumReadSize: 16,
-	}
-
-	// Open the port.
-	port, err := serial.Open(options)
-	if err != nil {
-		log.Fatalf("serial.Open: %v", err)
-	}
-
-	// Make sure to close it later.
-	defer port.Close()
-
-	// Write 4 bytes to the port.
-	// b := []byte{0x00, 0x01, 0x02, 0x03}
-	// n, err := port.Write(b)
-	// if err != nil {
-	// 	log.Fatalf("port.Write: %v", err)
-	// }
-
-	// fmt.Println("Wrote", n, "bytes.")
-	// var tokenByte string
-
-	reader := bufio.NewReader(port)
-	// decoder := json.NewDecoder(port)
-	encoder := json.NewEncoder(port)
-	command := map[string]interface{}{}
-	command["code"] = 1
-	command["light"] = 0
-
-	var data string
-	go func() {
-		for {
-			b, _, _ := reader.ReadLine()
-			recvObj := map[string]interface{}{}
-			err := json.Unmarshal(b, &recvObj)
-			// err = readJsonFromSerial(recvObj, decoder)
-			if err != nil {
-				if err.Error() == "EOF" {
-					return
-				}
-
-				fmt.Println("error: ", string(b))
-			}
-
-			data = string(b)
-			// fmt.Println("line : ", recvObj)
-		}
-	}()
-
-	cmdReader := bufio.NewReader(os.Stdin)
 	for {
-		fmt.Print("> ")
-		cmd, _, _ := cmdReader.ReadLine()
-		cmdTkns := strings.Split(string(cmd), " ")
-
-		if cmdTkns[0] == "light" {
-			command["code"] = 1
-			if cmdTkns[1] == "on" {
-				command["light"] = 100
-			} else {
-				command["light"] = 0
+		select {
+		case <-ctx.Done():
+			fmt.Println("routine bye")
+			return nil
+		case e := <-filter:
+			if strings.Contains(e.Path(), "/dev/ttyACM") {
+				fmt.Println(e.Path())
+				ch_discover <- e
 			}
-		} else if cmdTkns[0] == "fan" {
-			command["code"] = 2
-			if cmdTkns[1] == "on" {
-				command["status"] = 1
-			} else {
-				command["status"] = 0
-			}
-		} else if cmdTkns[0] == "servo" {
-			command["code"] = 3
-			angle, err := strconv.Atoi(cmdTkns[1])
-			if err != nil {
-				continue
-			}
-			command["angle"] = angle
-		} else if cmdTkns[0] == "print" {
-			fmt.Println(data)
-		}
-		err := encoder.Encode(command)
-		if err != nil {
-			panic(err)
 		}
 	}
 }
+
+// func InitUSB() (string, error) {
+// 	fs, err := ioutil.ReadDir("/dev")
+// 	if err != nil {
+// 		return "", err
+// 	}
+
+// 	for _, f := range fs {
+// 		if strings.Contains(f.Name(), "ttyACM") {
+// 			return filepath.Join("/dev", f.Name()), nil
+// 		}
+// 	}
+
+// 	return "", errors.New("USB Not found")
+// }
+
+// func Run() {
+// 	dev, err := InitUSB()
+// 	if err != nil {
+// 		if err.Error() == "USB Not found" {
+// 			dev = DiscoverUSB()
+// 		} else {
+// 			log.Fatalln(err.Error())
+// 		}
+// 	}
+
+// 	fmt.Println("discover: ", dev)
+// 	time.Sleep(time.Second)
+
+// 	log.Println("changing the mod of file")
+// 	cmd := exec.Command("chmod", "a+rw", dev)
+// 	b, _ := cmd.CombinedOutput()
+// 	fmt.Println(string(b))
+
+// 	// Set up options.
+// 	options := serial.OpenOptions{
+// 		PortName:        dev,
+// 		BaudRate:        9600,
+// 		DataBits:        8,
+// 		StopBits:        1,
+// 		MinimumReadSize: 16,
+// 	}
+
+// 	// Open the port.
+// 	port, err := serial.Open(options)
+// 	if err != nil {
+// 		log.Fatalf("serial.Open: %v", err)
+// 	}
+
+// 	// Make sure to close it later.
+// 	defer port.Close()
+
+// 	// Write 4 bytes to the port.
+// 	// b := []byte{0x00, 0x01, 0x02, 0x03}
+// 	// n, err := port.Write(b)
+// 	// if err != nil {
+// 	// 	log.Fatalf("port.Write: %v", err)
+// 	// }
+
+// 	// fmt.Println("Wrote", n, "bytes.")
+// 	// var tokenByte string
+
+// 	reader := bufio.NewReader(port)
+// 	// decoder := json.NewDecoder(port)
+// 	encoder := json.NewEncoder(port)
+// 	command := map[string]interface{}{}
+// 	command["code"] = 1
+// 	command["light"] = 0
+
+// 	var data string
+// 	go func() {
+// 		for {
+// 			b, _, _ := reader.ReadLine()
+// 			recvObj := map[string]interface{}{}
+// 			err := json.Unmarshal(b, &recvObj)
+// 			// err = readJsonFromSerial(recvObj, decoder)
+// 			if err != nil {
+// 				if err.Error() == "EOF" {
+// 					return
+// 				}
+
+// 				fmt.Println("error: ", string(b))
+// 			}
+
+// 			data = string(b)
+// 			// fmt.Println("line : ", recvObj)
+// 		}
+// 	}()
+
+// 	cmdReader := bufio.NewReader(os.Stdin)
+// 	for {
+// 		fmt.Print("> ")
+// 		cmd, _, _ := cmdReader.ReadLine()
+// 		cmdTkns := strings.Split(string(cmd), " ")
+
+// 		if cmdTkns[0] == "light" {
+// 			command["code"] = 1
+// 			if cmdTkns[1] == "on" {
+// 				command["light"] = 100
+// 			} else {
+// 				command["light"] = 0
+// 			}
+// 		} else if cmdTkns[0] == "fan" {
+// 			command["code"] = 2
+// 			if cmdTkns[1] == "on" {
+// 				command["status"] = 1
+// 			} else {
+// 				command["status"] = 0
+// 			}
+// 		} else if cmdTkns[0] == "servo" {
+// 			command["code"] = 3
+// 			angle, err := strconv.Atoi(cmdTkns[1])
+// 			if err != nil {
+// 				continue
+// 			}
+// 			command["angle"] = angle
+// 		} else if cmdTkns[0] == "print" {
+// 			fmt.Println(data)
+// 		}
+// 		err := encoder.Encode(command)
+// 		if err != nil {
+// 			panic(err)
+// 		}
+// 	}
+// }