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Node-serialport does not work when run above NW.js #5035

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sadr0b0t opened this issue Jun 27, 2016 · 7 comments
Closed

Node-serialport does not work when run above NW.js #5035

sadr0b0t opened this issue Jun 27, 2016 · 7 comments
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@hujiajie
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@sadr0b0t
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Operating System and Hardware: Ubuntu Linux 14.04 64 bit
NW.js version: v0.15.4, v0.16.0-beta2
Serialport version: 4.0.0-rc1, 3.1.2

Hello, Node-serialport fails to open serial port from inside application running above NW.js platform .

<!DOCTYPE html>
<html>
  <head>
    <title>Rraptor</title>
    <meta charset="UTF-8"/>

    <script type="text/javascript">
      var port;


      function writeLog(msg) {
        var logElement = document.getElementById("serial_read_data");
        logElement.innerHTML += msg + "<br>";
        logElement.scrollTop = logElement.scrollHeight;
      }

      /**
       * Обновить список последовательных портов
       */
      function updateSerialPortList() {
        var SerialPort = require('serialport');

        var combo = document.getElementById("serial_ports");
        combo.options.length = 0;

        SerialPort.list(function (err, ports) {
          ports.forEach(function(port) {
            console.log(port.comName);
            console.log(port.pnpId);
            console.log(port.manufacturer);

            var option = document.createElement("option");
            option.text = port.comName;
            option.value = port.comName;
            combo.add(option, null);
          });
        });
      }

      /**
       * Подключаемся к устройству на последовательном порте
       */
      function connectDevice(portName) {
        var SerialPort = require('serialport');

        port = new SerialPort(portName, {
          // скорость
          baudRate: 9600,
          // получать данные по одной строке
          parser: SerialPort.parsers.readline('\n'),
          // не открывать порт сразу здесь
          autoOpen: false,
          lock: true
        });

        // 
        // события
        // 

        // порт открылся
        port.on('open', function () {
          writeLog('Opened port: ' + portName);

          // пишем данные отсюда, результат получаем дальше 
          // в колбэке на событие data
          port.write('help');
        });

        // пришли данные
        port.on('data', function (data) {

          document.getElementById('serial_read_data').innerHTML += data;
          writeLog(data);
        });

        // 
        // Действия
        // 

        // открываем порт
        port.open(function(err) {
          if (err) {
            writeLog('Error opening serial connection ' + portName + ': ' + err);
          }
        });      
      }

      function sendCmd(cmd) {
        // пишем данные отсюда, результат получаем в колбэке на событие data
          port.write(cmd);
      }
    </script>
  </head>
  <body>
    <h1>Рраптор: панель управления</h1>
    <div>
      Устройство: <select name="serial_ports" id="serial_ports"></select> 
      <a href="javascript:updateSerialPortList()">обновить</a>

      <a href="javascript:connectDevice(document.getElementById('serial_ports').value)">Подключиться</a>
    </div>

    <a href="javascript:sendCmd('help')">Попросить о помощи</a>

    <div id="serial_read_data">
    </div>
  </body>
</html>

copy above code to index.html, then run application from same dir:

~/apps/nwjs-sdk-v0.16.0-beta2-linux-x64/nw .
The app would show window with dropdown list, click on "Update serial port list" link to fill the list of available serial ports (this would work), then select "/dev/ttyUSB0" (or other valid device connected to serial port), then click on "Connect device" link to connect to serial port.

On the first connection attempt it would return error event with "true" as err variable value (and it has boolean datatype), the second and all further connection attempt would return error event with err with "unable to lock device" message.

Same code runs just fine when run from command line with regular nodeJS: I am able to communicate device (Arduino), send commands, receive result etc. Getting list of serial ports also works just fine with NW.js.

Tried both with NW.js stable v0.15.4 and with latest v0.16.0-beta2 (sdk download option allows to use built-in debugger when run app).
http://nwjs.io/downloads/

Serialport version: 4.0.0-rc1, 3.1.2 - tried both, both fail

Same report for Node-serialport project
serialport/node-serialport#861

and same problem with Node-serialport+Electron
serialport/node-serialport#838
@sadr0b0t sadr0b0t mentioned this issue Jun 27, 2016
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@rogerwang rogerwang self-assigned this Jun 28, 2016
@Rainforce15
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confirming for OS X El Capitan as well - works in v0.14, but no longer in v0.15

@fanchou
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fanchou commented Jul 6, 2016

@rogerwang may be we should encapsulate chrome serial api，then we can use printer without driver and get more control of printer，and control hardware

@Mike-Dax
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Mike-Dax commented Jul 7, 2016

I'm getting the same issue, same circumstances on OSX Yosemite, 10.10.4.

@Pumpernickel61
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As a workaround you could use chrome serial api as described in https://developer.chrome.com/apps/serial, samples can be found here https://github.com/GoogleChrome/chrome-app-samples. Or is there any major difference between node serial and chrome serial?

@kailniris
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I am using chrome serial api from a long time it works like a charm.

@rogerwang rogerwang assigned sunlin-link and unassigned rogerwang Nov 17, 2016
@hujiajie hujiajie assigned hujiajie and unassigned sunlin-link Nov 29, 2016
@hujiajie
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hujiajie commented Jul 3, 2017

@Christywl, I cannot reproduce the issue with a recent revision of NW.js. Would you please help to verify it? I'd like to close the issue if it also works from you side.

@Christywl
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I can connect to the Arduino device on Linux with nwjs-sdk-v0.22.3.

@hujiajie hujiajie closed this as completed Jul 3, 2017
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@rogerwang @hujiajie @sunlin-link @sadr0b0t @fanchou @Rainforce15 @Mike-Dax @kailniris @Christywl @Pumpernickel61