WiFiExtender.ino

#include <WiFi.h>

#define STA_SSID "YOUR-SSID"
#define STA_PASS "YOUR-PASS"

#define AP_SSID "ESP32-WIFI-EXTENDER"
#define AP_PASS "password"

IPAddress ap_ip(192, 168, 4, 1);
IPAddress ap_mask(255, 255, 255, 0);
IPAddress ap_leaseStart(192, 168, 4, 2);
IPAddress ap_dns(8, 8, 4, 4);

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  Network.onEvent(onEvent);

  WiFi.AP.begin();
  WiFi.AP.config(ap_ip, ap_ip, ap_mask, ap_leaseStart, ap_dns);
  WiFi.AP.create(AP_SSID, AP_PASS);
  if (!WiFi.AP.waitStatusBits(ESP_NETIF_STARTED_BIT, 1000)) {
    Serial.println("Failed to start AP!");
    return;
  }

  WiFi.begin(STA_SSID, STA_PASS);
}

void loop() {
  delay(20000);
}

void onEvent(arduino_event_id_t event, arduino_event_info_t info) {
  switch (event) {
    case ARDUINO_EVENT_WIFI_STA_START:     Serial.println("STA Started"); break;
    case ARDUINO_EVENT_WIFI_STA_CONNECTED: Serial.println("STA Connected"); break;
    case ARDUINO_EVENT_WIFI_STA_GOT_IP:
      Serial.println("STA Got IP");
      Serial.println(WiFi.STA);
      WiFi.AP.enableNAPT(true);
      break;
    case ARDUINO_EVENT_WIFI_STA_LOST_IP:
      Serial.println("STA Lost IP");
      WiFi.AP.enableNAPT(false);
      break;
    case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
      Serial.println("STA Disconnected");
      WiFi.AP.enableNAPT(false);
      break;
    case ARDUINO_EVENT_WIFI_STA_STOP: Serial.println("STA Stopped"); break;

    case ARDUINO_EVENT_WIFI_AP_START:
      Serial.println("AP Started");
      Serial.println(WiFi.AP);
      break;
    case ARDUINO_EVENT_WIFI_AP_STACONNECTED:    Serial.println("AP STA Connected"); break;
    case ARDUINO_EVENT_WIFI_AP_STADISCONNECTED: Serial.println("AP STA Disconnected"); break;
    case ARDUINO_EVENT_WIFI_AP_STAIPASSIGNED:
      Serial.print("AP STA IP Assigned: ");
      Serial.println(IPAddress(info.wifi_ap_staipassigned.ip.addr));
      break;
    case ARDUINO_EVENT_WIFI_AP_PROBEREQRECVED: Serial.println("AP Probe Request Received"); break;
    case ARDUINO_EVENT_WIFI_AP_STOP:           Serial.println("AP Stopped"); break;

    default: break;
  }
}