wifi_scan.cpp

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#include <WiFi.h>
 
void setup() {
  Serial.begin(115200);
 
  // Set WiFi to station mode and disconnect from an AP if it was previously
  // connected.
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);
 
  Serial.println("Setup done");
}
 
void loop() {
  Serial.println("Scan start");
 
  // WiFi.scanNetworks will return the number of networks found.
  int n = WiFi.scanNetworks();
  Serial.println("Scan done");
  if (n == 0) {
    Serial.println("no networks found");
  } else {
    Serial.print(n);
    Serial.println(" networks found");
    Serial.println(
        "Nr | SSID                             | RSSI | CH | Encryption");
    for (int i = 0; i < n; ++i) {
      // Print SSID and RSSI for each network found
      Serial.printf("%2d", i + 1);
      Serial.print(" | ");
      Serial.printf("%-32.32s", WiFi.SSID(i).c_str());
      Serial.print(" | ");
      Serial.printf("%4d", WiFi.RSSI(i));
      Serial.print(" | ");
      Serial.printf("%2d", WiFi.channel(i));
      Serial.print(" | ");
      switch (WiFi.encryptionType(i)) {
        case WIFI_AUTH_OPEN:
          Serial.print("open");
          break;
        case WIFI_AUTH_WEP:
          Serial.print("WEP");
          break;
        case WIFI_AUTH_WPA_PSK:
          Serial.print("WPA");
          break;
        case WIFI_AUTH_WPA2_PSK:
          Serial.print("WPA2");
          break;
        case WIFI_AUTH_WPA_WPA2_PSK:
          Serial.print("WPA+WPA2");
          break;
        case WIFI_AUTH_WPA2_ENTERPRISE:
          Serial.print("WPA2-EAP");
          break;
        case WIFI_AUTH_WPA3_PSK:
          Serial.print("WPA3");
          break;
        case WIFI_AUTH_WPA2_WPA3_PSK:
          Serial.print("WPA2+WPA3");
          break;
        case WIFI_AUTH_WAPI_PSK:
          Serial.print("WAPI");
          break;
        default:
          Serial.print("unknown");
      }
      Serial.println();
      delay(10);
    }
  }
  Serial.println("");
 
  // Delete the scan result to free memory for code below.
  WiFi.scanDelete();
 
  // Wait a bit before scanning again.
  delay(5000);
}