added test

.vscode/extensions.json

-{
-    // See http://go.microsoft.com/fwlink/?LinkId=827846
-    // for the documentation about the extensions.json format
-    "recommendations": [
-        "platformio.platformio-ide"
-    ]
-}
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

src/main.cpp

 #include <Wire.h>
 
 #include "PCA9685.h"
+#include <GDBStub.h>
 
 #define ESP12_LED 2
 #define NODEMCU_LED 16
 }
 
 void setup() {
-  Serial.begin(115200);
+  Serial.begin(460800);
+  gdbstub_init();
+
   Serial.println(F("Booting ...."));
 
   pinMode(NODEMCU_LED, OUTPUT);