feat(core): Add wait time before setup

cores/esp32/Arduino.h

@@ -228,6 +228,14 @@ bool shouldPrintChipDebugReport(void);
     return true;                          \
   }
 
+// macro SET_TIME_BEFORE_STARTING_SKETCH_MS(time_ms) can set a time in milliseconds
+// before the sketch would start its execution. It gives the user time to open the Serial Monitor
+uint64_t getArduinoSetupWaitTime_ms(void);
+#define SET_TIME_BEFORE_STARTING_SKETCH_MS(time_ms)      \
+  uint64_t getArduinoSetupWaitTime_ms() { \
+    return (time_ms);                     \
+  }
+
 // allows user to bypass esp_spiram_test()
 bool esp_psram_extram_test(void);
 #define BYPASS_SPIRAM_TEST(bypass)    \

cores/esp32/main.cpp

@@ -44,10 +44,18 @@ __attribute__((weak)) bool shouldPrintChipDebugReport(void) {
   return false;
 }
 
+// this function can be changed by the sketch using the macro SET_TIME_BEFORE_STARTING_SKETCH_MS(time_ms)
+__attribute__((weak)) uint64_t getArduinoSetupWaitTime_ms(void) {
+  return 0;
+}
+
 void loopTask(void *pvParameters) {
 #if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
   // sets UART0 (default console) RX/TX pins as already configured in boot or as defined in variants/pins_arduino.h
   Serial0.setPins(gpioNumberToDigitalPin(SOC_RX0), gpioNumberToDigitalPin(SOC_TX0));
+  // time in ms that the sketch may wait before starting its execution - default is zero
+  // usually done for opening the Serial Monitor and seeing all debug messages
+  delay(getArduinoSetupWaitTime_ms());
 #endif
 #if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_DEBUG
   printBeforeSetupInfo();

libraries/ESP32/examples/ArduinoWaitTimeBeforeStartingSketch/ArduinoWaitTimeBeforeStartingSketch.ino

@@ -0,0 +1,15 @@
+// macro SET_TIME_BEFORE_STARTING_SKETCH_MS(time_ms) can set a time in milliseconds
+// before the sketch would start its execution. It gives the user time to open the Serial Monitor
+
+// This will force the Sketch execution to wait for 5 seconds before starting it execution
+// setup() will be executed only after this time
+SET_TIME_BEFORE_STARTING_SKETCH_MS(5000);
+
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("After 5 seconds... this message will be seen in the Serial Monitor.");
+}
+
+void loop() {
+}