It is working fine 
Thank you very much!
main.cpp
#include <Arduino.h>
int i;
void setup() {
/* Serial.begin(UPLOAD_SPEED,SERIAL_8N1);*/
Serial.begin(115200);
delay(1000);
while (!Serial)
{
delay(10);
Serial.println("================================");
Serial.println("= Error to initialize USB port =");
};
Serial.println("=========================================");
Serial.println("= USB port initialize with " + String(UPLOAD_SPEED) + " baud.");
Serial.println("= This firmware was uploaded from " + String(UPLOAD_PORT));
Serial.println("= Monitor speed was " + String(MONITOR_SPEED) + " baud.");
Serial.println("=========================================");
Serial.println("======= work fine in setup section ================");
i = 1;
}
void loop()
{
while (i <= 10)
{
Serial.println("======= work fine in loop section i = " + String(i));
i++;
}
}
platformio.ini
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[upload_settings]
upload_port = COM15
upload_speed = 115200
monitor_speed = 9600
[env:wiscore_rak4631]
platform = nordicnrf52
board = wiscore_rak4631
framework = arduino
; lib_deps =
; ArduinoModbus
; closedcube/ClosedCube OPT3001@^1.1.2
; boschsensortec/BSEC Software Library @ ^1.6.1480
; beegee-tokyo/SX126x-Arduino@^1.2.1
build_flags =
-L".pio/libdeps/wiscore_rak4631/BSEC Software Library/src/cortex-m4/fpv4-sp-d16-hard"
; -DREGION_AU915
-D UPLOAD_PORT=\"${upload_settings.upload_port}\"
-D UPLOAD_SPEED=${upload_settings.upload_speed}
-D MONITOR_SPEED=${upload_settings.monitor_speed}
extends = upload_settings
