A snippet to find a specific WiFi network with ESP32

esp32-wifi-finder.cpp

#include <Arduino.h>
#include <WiFi.h>

const char * SPECIFIC_SSID = "MyNetwork";
const char * ENC_TYPE[] = {
    "Open",
    "WEP",
    "WPA-PSK",
    "WPA2-PSK",
    "WPA-WPA2-PSK",
    "WPA2-Enterprise",
    "Unknown"
};

struct WiFiInfo {
    bool             found;
    int32_t          channel;
    int32_t          rssi;
    wifi_auth_mode_t auth_mode;
} wifi_info;

void findWiFi(const char * const ssid, WiFiInfo * const info) {
    info->found = false;
    int16_t n = WiFi.scanNetworks();
    for (uint8_t i=0; i<n; ++i) {
        if (strcmp(WiFi.SSID(i).c_str(), ssid) == 0) {
            info->found     = true;
            info->channel   = WiFi.channel(i);
            info->rssi      = WiFi.RSSI(i);
            info->auth_mode = WiFi.encryptionType(i);
            return;
        }
    }
}

void setup() {
    Serial.begin(115200);
    findWiFi(SPECIFIC_SSID, &wifi_info);
    Serial.printf(wifi_info.found
        ? "SSID: %s, channel: %i, RSSI: %i dBm, encryption: %s\n"
        : "SSID: %s ... could not be found\n",
            SPECIFIC_SSID,
            wifi_info.channel,
            wifi_info.rssi,
            ENC_TYPE[wifi_info.auth_mode]);
}

void loop() {}