fix dtr on serial open

Author: adiazulay

src/serialmonitor/serialportctrl.ts

@@ -71,14 +71,19 @@ export class SerialPortCtrl {
             this._outputChannel.appendLine("[Warning] Auto checking serial port open is disabled");
             return resolve();
           }
-
+          
           this._currentSerialPort.write("TestingOpen" + "\r\n", (err) => {
             // TODO: Fix this on the serial port lib: https://github.com/EmergingTechnologyAdvisors/node-serialport/issues/795
             if (err && !(err.message.indexOf("Writing to COM port (GetOverlappedResult): Unknown error code 121") >= 0)) {
               this._outputChannel.appendLine(`[Error] Failed to open the serial port - ${this._currentPort}`);
               reject(err);
             } else {
               this._outputChannel.appendLine(`[Info] Opened the serial port - ${this._currentPort}`);
+              this._currentSerialPort.set(['dtr=true'], (err) => {
+                if (err) {
+                  reject(err);
+                } 
+              });
               resolve();
             }
           });
@@ -164,7 +169,13 @@ export class SerialPortCtrl {
         if (err) {
           reject(err);
         } else {
-          resolve();
+          this._currentSerialPort.set(['dtr=true'], (err) => {
+            if (err) {
+              reject(err);
+            } else {
+              resolve();
+            }
+          });
         }
       });
     });