Is it possible to get mac addresses when scanning networks? ESP32-CodePudding

I need to get the RSSI of the networks and they MAC addresss to a IPS (indoor position system) program. I was able to get ssid, signal strength and security using the sample code, but not mac addresses. I tryed to use this, but itsn't working:

void loop() {
  int n = WiFi.scanNetworks();

  if(n == 0){
    Serial.println("no networks found");
  }
  else{
      for (int i = 0; i < n;   i) {
        Serial.print(i   1);
        Serial.print(": ");
        Serial.print(WiFi.SSID(i));
        Serial.print(" (");
        Serial.print(WiFi.RSSI(i));
        Serial.print(")");
        Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN)?" ":"*");
        Serial.println(WiFi.macAddress(i));
        delay(10);
      }
  }
  delay(10000);
}

CodePudding user response：

@Tarmo's answer is correct, but the Arduino core does provide a simpler interface to getting the AP's access point without having to directly call ESP-IDF functions.

Use the BSSID method to get the MAC address of the base station's wifi radio.

You can call either the BSSID() method to get a pointer to the six byte MAC address or BSSIDstr() to get the MAC address as a string.

So for instance:

        Serial.print(WiFi.BSSIDstr(i));

will print the MAC address as a string.

When you're stuck on this kind of things referring to the library's source code can help you find out more than documentation and tutorials may.

CodePudding user response：

Maybe the Arduino framework doesn't give this information up easily, but the underlying ESP IDF framework certainly does. The AP-s MAC is called BSSID. Adapting this example scan.c:

#include "esp_wifi.h"

#define DEFAULT_SCAN_LIST_SIZE 10

void wifi_scan(void) {
    uint16_t ap_count = 0;
    uint16_t number = DEFAULT_SCAN_LIST_SIZE;
    wifi_ap_record_t ap_info[DEFAULT_SCAN_LIST_SIZE];

    esp_wifi_scan_start(NULL, true);
    ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&number, ap_info));
    ESP_ERROR_CHECK(esp_wifi_scan_get_ap_num(&ap_count));
    printf("Total APs scanned = %u", ap_count);
    for (int i = 0; (i < DEFAULT_SCAN_LIST_SIZE) && (i < ap_count); i  ) {
        printf("SSID \t\t%s", ap_info[i].ssid);
        printf("RSSI \t\t%d", ap_info[i].rssi);
        printf("BSSID \t\tXXXXXX\n", 
            ap_info[i].bssid[0], ap_info[i].bssid[1], ap_info[i].bssid[2], 
            ap_info[i].bssid[3], ap_info[i].bssid[4], ap_info[i].bssid[5]);
    }
}

Have a look at the official docs for struct wifi_ap_record_t to see what other information is available.