diff --git a/PrinterDev.js b/PrinterDev.js
new file mode 100644
index 0000000..8d1b959
--- /dev/null
+++ b/PrinterDev.js
@@ -0,0 +1,64 @@
+const EventEmitter = require('events')
+const escpos = require('escpos')
+const config = require('./config.json')
+const fs = require('fs')
+
+// const device = new escpos.Serial(config.printer.serial)
+
+// const printer = new escpos.Printer(device)
+// let isOpen = false
+
+class PrinterDevice {
+  constructor() {
+    this._isOpen = false
+    this._device = null
+    this._printer = null
+    this._type = null // type = serial or console
+  }
+
+  async connect() {
+    let chkSerial = await new Promise((resolve, reject) => {
+      fs.access(config.printer.serial, err => {
+        if (err) return resolve(false)
+        return resolve(true)
+      })
+    })
+    if (chkSerial) {
+      this._device = new escpos.Serial(config.printer.serial)
+      this._type = 'serial'
+    } else {
+      this._device = new escpos.Console()
+      this._type = 'console'
+    }
+    this._printer = new escpos.Printer(this._device)
+    this.openSerial()
+  }
+
+  async openSerial() {
+    if (!this._device || this._type != 'serial') return
+    this._isOpen = await new Promise((resolve, reject) => {
+      this._device.open(err => {
+        if (err) return resolve(false)
+        return resolve(true)
+      })
+    })
+  }
+
+  printerString(str) {
+    if (!this._isOpen || !this._printer) return
+    let strs = str.split(/\n/)
+    this._printer.font('a')
+      .align('ct')
+      .size(1, 1)
+    for (let i in strs) {
+      printer.text(strs[i], 'big5')
+    }
+    printer.cut(true, 8)
+  }
+
+  get isOpen() {
+    return this._isOpen ? true : false
+  }
+}
+
+module.exports = new PrinterDevice()
\ No newline at end of file
diff --git a/app.js b/app.js
index d195fa7..6c85a13 100644
--- a/app.js
+++ b/app.js
@@ -2,9 +2,12 @@ const bleno = require('bleno')
 const config = require('./config.json')
 const adapterName = 'BLE_Printer'
 const serverUUID = config.uuid.main
-
+const localEvent = require('./localEvent')
+const fs = require('fs')
 const MainService = require('./main-service')
 
+const printer = require('./PrinterDev')
+
 bleno.on('stateChange', state => {
   console.log(`bt device state ${state}`)
   if (state == 'poweredOn') {
@@ -26,3 +29,16 @@ bleno.on('advertisingStart', function (error) {
     })
   }
 })
+
+localEvent.on('print', async (str) => {
+  let status = false
+  if (printer.isOpen) {
+    try {
+      status = await printer.printerString(str)
+    } catch (err) {
+      status = false
+    }
+  }
+
+  localEvent.emit('printResult', status)
+})
\ No newline at end of file
diff --git a/config.json b/config.json
index 74309ac..9b2bba9 100644
--- a/config.json
+++ b/config.json
@@ -4,8 +4,7 @@
 		"service":{
 			"id":"dd535b71-8f05-4e30-beb0-6fa7ea3dfc3e",
 			"func":{
-				"time":"00000001-8f05-4e30-beb0-6fa7ea3dfc3e",
-				"data":"00000002-8f05-4e30-beb0-6fa7ea3dfc3e"
+				"data":"00000001-8f05-4e30-beb0-6fa7ea3dfc3e"
 			}
 		}
 	},
diff --git a/gdata-characteristic.js b/gdata-characteristic.js
index 25e75c5..cbf0ca7 100644
--- a/gdata-characteristic.js
+++ b/gdata-characteristic.js
@@ -1,13 +1,6 @@
 const bleno = require('bleno')
 const config = require('./config.json')
-const escpos = require('escpos')
-const device = new escpos.Serial(config.printer.serial)
-const printer = new escpos.Printer(device)
-let isOpen = false
-
-device.open(()=>{
-  isOpen = true
-})
+const localEvent = require('./localEvent')
 
 var tmp = []
 
@@ -38,10 +31,11 @@ class DataCharacteristic extends bleno.Characteristic {
     } else if (data.length == 1 && data[0] == 0xff) {
       //console.log(tmp)
       console.log(Buffer.from(tmp).toString())
-      printString(Buffer.from(tmp).toString())
-      if(this._notifyFunc) {
-        this._notifyFunc(Buffer.from([0x00,0x01]))
-      }
+      localEvent.emit('print', Buffer.from(tmp).toString())
+      // printString(Buffer.from(tmp).toString())
+      // if(this._notifyFunc) {
+      //   this._notifyFunc(Buffer.from([0x00,0x01]))
+      // }
     } else {
       tmp = [...tmp, ...data.slice(2, data.length)]
     }
@@ -51,37 +45,19 @@ class DataCharacteristic extends bleno.Characteristic {
     }
   }
 
+  sendNotidy(str) {
+    if (!this._notifyFunc) return
+    this._notifyFunc(Buffer.from(str))
+  }
+
   onSubscribe(maxValueSize, cb) {
     console.log(maxValueSize)
     this._notifyFunc = cb
   }
 
-  onUnsubscribe () {
+  onUnsubscribe() {
     this._notifyFunc = null
   }
 }
 
-
-function printString(str){
-  if(!isOpen) return 
-  let strs = str.split(/\n/)
-  printer.font('a')
-    .align('ct')
-    .size(1,1)
-  for(let i in strs){
-    printer.text(strs[i], 'big5')
-  }
-  printer.cut(true, 8)
-}
-
-process.on('SIGINT', async ()=>{
-	await new Promise((resolve, reject) => {
-			device.close(()=>{
-				console.log('serial device close')
-				resolve(null)
-			})
-		})
-	process.exit(0)
-})
-
 module.exports = DataCharacteristic
diff --git a/localEvent.js b/localEvent.js
new file mode 100644
index 0000000..24798fb
--- /dev/null
+++ b/localEvent.js
@@ -0,0 +1,10 @@
+const EventEmitter = require('events')
+const util = require('util')
+
+class LocalEvent extends EventEmitter {
+  constructor(){
+    super()
+  }
+}
+
+module.exports = new LocalEvent()
\ No newline at end of file
diff --git a/main-service.js b/main-service.js
index e69b608..4dc21c3 100644
--- a/main-service.js
+++ b/main-service.js
@@ -1,19 +1,24 @@
 const bleno = require('bleno')
 const config = require('./config.json')
+const localEvent = require('./localEvent')
 
-const TimeCharacteristic = require('./time-characteristic')
+// const TimeCharacteristic = require('./time-characteristic')
 const GdataCharacteristic = require('./gdata-characteristic')
+const dataCharacteristic = new GdataCharacteristic()
 
 class MainService extends bleno.PrimaryService {
-  constructor(){
+  constructor() {
     super({
       uuid: config.uuid.service.id,
       characteristics: [
-        new TimeCharacteristic(),
-        new GdataCharacteristic()
+        dataCharacteristic
       ]
     })
   }
 }
 
+localEvent.on('printResult', async str => {
+  dataCharacteristic.sendNotidy(str)
+})
+
 module.exports = MainService