Fix upload and serial (#661)

* get serial connection status from BE

* handle serial connect in the BE

* allow breakpoints on vscode (windows)

* Timeout on config change to prevent serial busy

* serial-service tests

arduino-ide-extension/src/node/web-socket/web-socket-service-impl.ts

@@ -11,6 +11,9 @@ export default class WebSocketServiceImpl implements WebSocketService {
   protected readonly onMessage = new Emitter<string>();
   public readonly onMessageReceived = this.onMessage.event;
 
+  protected readonly onConnectedClients = new Emitter<number>();
+  public readonly onClientsNumberChanged = this.onConnectedClients.event;
+
   constructor() {
     this.wsClients = [];
     this.server = new WebSocket.Server({ port: 0 });
@@ -21,8 +24,11 @@ export default class WebSocketServiceImpl implements WebSocketService {
 
   private addClient(ws: WebSocket): void {
     this.wsClients.push(ws);
+    this.onConnectedClients.fire(this.wsClients.length);
+
     ws.onclose = () => {
       this.wsClients.splice(this.wsClients.indexOf(ws), 1);
+      this.onConnectedClients.fire(this.wsClients.length);
     };
 
     ws.onmessage = (res) => {
@@ -30,6 +36,10 @@ export default class WebSocketServiceImpl implements WebSocketService {
     };
   }
 
+  getConnectedClientsNumber(): number {
+    return this.wsClients.length;
+  }
+
   getAddress(): WebSocket.AddressInfo {
     return this.server.address() as WebSocket.AddressInfo;
   }

arduino-ide-extension/src/node/web-socket/web-socket-service.ts

@@ -6,4 +6,6 @@ export interface WebSocketService {
   getAddress(): WebSocket.AddressInfo;
   sendMessage(message: string): void;
   onMessageReceived: Event<string>;
+  onClientsNumberChanged: Event<number>;
+  getConnectedClientsNumber(): number;
 }