commit 0ffe9fb52c74455099dbc9e6f403ad9099914968
Author: Jay <admin@trj.tw>
Date:   Mon May 7 13:25:53 2018 +0800

    first

diff --git a/index.js b/index.js
new file mode 100644
index 0000000..f6b7e70
--- /dev/null
+++ b/index.js
@@ -0,0 +1,172 @@
+const dgram = require('dgram')
+const server = dgram.createSocket('udp4')
+const net = require('net')
+const WebSocket = require('ws')
+
+let lego = {
+  sn: null,
+  port: null,
+  name: null,
+  proto: null,
+  addr: null,
+  connected: false
+}
+let legoClient = null
+
+function padleft(v, n) {
+  if (typeof v !== 'string') v = v.toString()
+  if (v.length < n) {
+    return padleft(`0${v}`, n)
+  }
+  return v
+}
+
+function convertLength(num, blng = 1) {
+  let str = num.toString(16)
+  let tlng = blng * 2
+
+  switch (str.length) {
+    case 1:
+      if (tlng > 2) return `0${str}00`
+      else return `0${str}`
+    case 2:
+      if (tlng > 2) return `${str}00`
+      else return `${str}`
+    case 3:
+      return `${str.substr(-2)}0${str.substr(0, 1)}`
+    case 4:
+      return `${str.substr(-2)}${str.substr(0, 2)}`
+  }
+
+  return padleft('0', tlng)
+}
+
+function getMsgByte(name, val) {
+  let name_buf = Buffer.from(name)
+  name_buf = Buffer.concat([name_buf, Buffer.from([0x00])], (name_buf.length + 1))
+  let name_lng = name_buf.length
+
+  let val_buf = null
+  if (typeof val === 'number') {
+    val_buf = Buffer.allocUnsafe(4)
+    val_buf.writeFloatLE(val)
+  } else {
+    if (typeof val !== 'string') val.toString()
+    val_buf = Buffer.from(val)
+    val_buf = Buffer.concat([val_buf, Buffer.from([0x00])], (val_buf.length + 1))
+  }
+  if (val_buf === null) return null
+  let val_lng = val_buf.length
+
+  return `${convertLength(name_lng, 1)}${name_buf.toString('hex')}${convertLength(val_lng, 2)}${val_buf.toString('hex')}`
+}
+
+server.on('error', err => {
+  console.log('error ', err)
+  server.close()
+})
+server.on('message', (msg, rinfo) => {
+  console.log('message', msg.toString())
+  console.log('rinfo', rinfo)
+  let str = msg.toString()
+  let regex = /Serial\-Number:\s(\w+)\r\nPort:\s(\d+)\r\nName:\s(\w+)\r\nProtocol:\s(\w+)/
+  let match = str.match(regex)
+  if (match.length > 4) {
+    lego.sn = match[1]
+    lego.port = match[2]
+    lego.name = match[3]
+    lego.proto = match[4]
+  }
+  lego.addr = rinfo.address
+  console.log('lego info ', lego)
+
+  let client = dgram.createSocket('udp4')
+  client.send(Buffer.from([0x01]), lego.port, lego.addr, (err) => {
+    if (err) {
+      console.log('send udp error')
+      client.close()
+      return
+    }
+
+    try {
+      server.close()
+    } catch (err) { }
+
+    connectEV3()
+
+    try {
+      client.close()
+    } catch (err) { }
+  })
+})
+server.bind(3015)
+
+async function connectEV3() {
+  legoClient = net.createConnection({
+    port: lego.port,
+    host: lego.addr
+  }, () => {
+    console.log('connected')
+    console.log('send unlock')
+    legoClient.write(`GET /target?sn=${lego.sn} VMTP1.0\nProtocol: ${lego.proto}`)
+  })
+
+  legoClient.on('data', data => {
+    console.log('get ev3 data', data.toString())
+    let str = data.toString()
+    if (/Accept/i.test(str)) {
+      lego.connected = true
+    }
+  })
+
+  legoClient.on('end', () => {
+    console.log('connect end')
+    legoClient = null
+    lego.connected = false
+  })
+}
+
+const ws = new WebSocket.Server({
+  port: 9999
+})
+
+ws.on('connection', client => {
+  client.on('message', msg => {
+    console.log(msg)
+    let s = ''
+    let wbuf = null
+    let lng = 0
+    switch (msg) {
+      case 'check':
+        client.send(`ev3 connect: ${lego.connected}`)
+        break
+      case 'forward':
+        if (!lego.connected) break
+        s = `0000819e${getMsgByte('a', 90)}`
+        s = `${convertLength(s.length / 2, 2)}${s}`
+        wbuf = Buffer.from(s, 'hex')
+        console.log('write byte ', s)
+        legoClient.write(wbuf)
+        break
+      case 'back':
+        if (!lego.connected) break
+        s = `0000819e${getMsgByte('c', 90)}`
+        s = `${convertLength(s.length / 2, 2)}${s}`
+        wbuf = Buffer.from(s, 'hex')
+        console.log('write byte ', s)
+        legoClient.write(wbuf)
+        break
+      case 'click':
+        if (!lego.connected) break
+        s = `0000819e${getMsgByte('b', 90)}`
+        s = `${convertLength(s.length / 2, 2)}${s}`
+        wbuf = Buffer.from(s, 'hex')
+        console.log('write byte ', s)
+        legoClient.write(wbuf)
+        break
+      case 'restart':
+        process.exit(0)
+        break
+    }
+  })
+})
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..ad696af
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,854 @@
+{
+  "name": "ev3_ctrl",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "version": "1.1.1",
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+    },
+    "ajv": {
+      "version": "4.11.8",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
+      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "requires": {
+        "co": "4.6.0",
+        "json-stable-stringify": "1.0.1"
+      }
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f2d6a6c
--- /dev/null
+++ b/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "ev3_ctrl",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "ws": "^5.1.1"
+  }
+}