I found an interesting AccelWebServer sketch which could help me doing my own sw. But the compiler does not find the "arduino_secrets.h" file. Do I need it, what it is and so on.
Edit: It looks like the file is not needed. And the sketch gets a time out after a few runs.
#include <SPI.h>
#include <WiFiNINA.h>
#include <Arduino_LSM6DS3.h>
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = hhghghgu; // your network SSID (name)
char pass[] = jkjkjmn; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
WiFiServer server(80);