Non-functional Serial Monitor/Plotter

[per1234]

Describe the problem

🐛 The Arduino IDE's Serial Monitor and Serial Plotter features are non-functional.

To reproduce

Equipment

• Any Arduino board

Steps

1. Connect an Arduino board to your computer.
2. Select the board and port from the Arduino IDE menus.
3. Upload a sketch that will demonstrate serial input and output capabilities are working:

   unsigned long previousMillis;
   void setup() {
     Serial.begin(9600);
   }
   void loop() {
     if (Serial.available() > 0) {
       while (Serial.available() > 0) {
         Serial.write(Serial.read());
         delay(10);
       }
     } else if (millis() - previousMillis >= 1000) {
       previousMillis = millis();
       Serial.println("hello");
     }
   }

4. Open the "Serial Monitor" view.
   🐛 There is no baud rate menu.
   🐛 The expected output is not printed.
5. Type some text in the "Message ..." field.
6. Press Ctrl+Enter.
   🐛 The expected reaction to the message does not occur.
7. Select Tools > Serial Plotter from the Arduino IDE menus.
   🐛 The Serial Plotter window does not open.

Expected behavior

Standard functionality from Serial Monitor and Serial Plotter.

Arduino IDE version

2.0.0-rc8-snapshot-7d96153

Operating system

Windows, Linux

Operating system version

Windows 10, Ubuntu 20.04

Additional context

I bisected the bug to a36524e (does not occur when using the build for 1073c3f).

---

The following is printed to the logs the first time Serial Monitor or Serial Plotter is opened:

root INFO starting monitor
root ERROR Request startMonitor failed with error: Cannot read properties of undefined (reading 'client')
root ERROR Uncaught Exception:
root ERROR TypeError: Cannot read properties of undefined (reading 'client')
    at MonitorService.get coreClient [as coreClient] (C:\ide 2\tip\68-7d96153\resources\app\node_modules\arduino-ide-extension\lib\node\core-client-provider.js:291:40)
    at MonitorService.portMonitorSettings (C:\ide 2\tip\68-7d96153\resources\app\node_modules\arduino-ide-extension\lib\node\monitor-service.js:336:39)
    at new MonitorService (C:\ide 2\tip\68-7d96153\resources\app\node_modules\arduino-ide-extension\lib\node\monitor-service.js:58:14)
    at MonitorManager.monitorServiceFactory (C:\ide 2\tip\68-7d96153\resources\app\node_modules\arduino-ide-extension\lib\node\arduino-ide-backend-module.js:137:16)
    at MonitorManager.createMonitor (C:\ide 2\tip\68-7d96153\resources\app\node_modules\arduino-ide-extension\lib\node\monitor-manager.js:241:30)
    at MonitorManager.startMonitor (C:\ide 2\tip\68-7d96153\resources\app\node_modules\arduino-ide-extension\lib\node\monitor-manager.js:77:28)
    at MonitorManagerProxyImpl.startMonitor (C:\ide 2\tip\68-7d96153\resources\app\node_modules\arduino-ide-extension\lib\node\monitor-manager-proxy-impl.js:45:29)
    at JsonRpcProxyFactory.onRequest (C:\ide 2\tip\68-7d96153\resources\app\node_modules\@theia\core\lib\common\messaging\proxy-factory.js:127:49)
    at C:\ide 2\tip\68-7d96153\resources\app\node_modules\@theia\core\lib\common\messaging\proxy-factory.js:106:54
    at handleRequest (C:\ide 2\tip\68-7d96153\resources\app\node_modules\vscode-jsonrpc\lib\main.js:376:27)

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details