add ble printer message parser method

PrinterDev.js

@@ -44,16 +44,39 @@ class PrinterDevice {
     })
   }
 
-  printerString(str) {
-    if (!this._isOpen || !this._printer) return
-    let strs = str.split(/\n/)
+  async printerString(str) {
+    if (!this._isOpen || !this._printer) return false
+
     this._printer.font('a')
       .align('ct')
       .size(1, 1)
-    for (let i in strs) {
-      this._printer.text(strs[i], 'big5')
+
+    let cmds = str.split(/__/).filter(t => t)
+
+    for (let i in cmds) {
+      let tmp = cmds[i]
+      if (tmp[0] === '&') {
+        switch (tmp[1]) {
+          case 'a':
+            let align = tmp.substring(2)
+            if (!align) break
+            this._printer.align(align)
+            break
+          case 's':
+            let size = tmp.substring(2)
+            let sarr = size.trim().split(',')
+            if (sarr != 2) break
+            this._printer.size(sarr[0], sarr[1])
+            break
+        }
+      } else {
+        this._printer.text(tmp, 'big5')
+      }
     }
-    this._printer.cut(true, 8)
+
+    this._printer.cut(true, config.printer.cutFeed || 4)
+
+    return true
   }
 
   async close() {
@@ -61,7 +84,7 @@ class PrinterDevice {
     if (this._type == 'serial') {
       let self = this
       await new Promise((resolve, reject) => {
-        self._device.close(() => {
+        self._printer.close(() => {
           resolve(1)
         })
       })

app.js

@@ -8,6 +8,16 @@ const MainService = require('./main-service')
 
 const printer = require('./PrinterDev')
 
+async function initSystem(){
+  try{
+    await printer.connect()
+  }catch(err){
+    throw err
+  }
+}
+
+initSystem()
+
 bleno.on('stateChange', state => {
   console.log(`bt device state ${state}`)
   if (state == 'poweredOn') {
@@ -31,7 +41,6 @@ bleno.on('advertisingStart', function (error) {
 })
 
 localEvent.on('print', async (str) => {
-  console.log(`get printer string >>> \n${str}`)
   let status = false
   if (printer.isOpen) {
     try {
@@ -46,4 +55,5 @@ localEvent.on('print', async (str) => {
 
 process.on('SIGINT', () => {
   printer.close()
+  process.exit(0)
 })

config.json

@@ -9,6 +9,7 @@
 		}
 	},
 	"printer": {
-		"serial": "/dev/ttyUSB0"
+		"serial": "/dev/ttyUSB0",
+		"cutFeed": 8
 	}
 }

main-service.js

@@ -17,7 +17,8 @@ class MainService extends bleno.PrimaryService {
   }
 }
 
-localEvent.on('printResult', async str => {
+localEvent.on('printResult', async state => {
+  let str = state ? 'ok' : 'fail'
   dataCharacteristic.sendNotidy(str)
 })