====== WiFi na ESP32 ======
Obsługa WiFi na ESP32.\\
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===== Deklaracje =====

<code c>
#include "Arduino.h"
#include <WiFi.h>

const String WiFi_SSID = "nazwa_wifi";  // WiFi SSID
const String WiFi_password = "haslo_wifi";  // WiFi hasło
String WiFi_IP = "";  // WiFi IP uzupełniane po nawiązaniu połączenia

WiFiClient wifiClient;

void connectWiFi();
</code>
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===== Połączenie podczas uruchomienia =====

<code c>
void setup()
{
  connectWiFi();
}
</code>
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===== Ponowne łączenie w przypadku rozłączenia =====

<code c>
void loop()
{
  if (WiFi.status() != WL_CONNECTED) { connectWiFi(); }
  vTaskDelay(pdMS_TO_TICKS(10));
}
</code>
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===== Funkcja =====

<code c>
void connectWiFi()
{
  digitalWrite(BUILT_LED, LOW);
  WiFi.hostname(myHostname);
  WiFi.mode(WIFI_STA);
  WiFi.begin(WiFi_SSID, WiFi_password);
  int attempt = 0;
  Serial.print("Connecting to WiFi ");

  while (WiFi.status() != WL_CONNECTED)
  {
    if (attempt == 30)
        {
      Serial.println("Reboot po 30 probach polaczenia z WiFi");
      ESP.restart();
    }
    ++attempt;
    vTaskDelay(pdMS_TO_TICKS(500));

    wl_status_t status = WiFi.status();
    if(status != WL_CONNECTED) {
      digitalWrite(BUILT_LED, HIGH);
      Serial.print("   Connecting to WiFi error: ");
      Serial.println(status);
      vTaskDelay(pdMS_TO_TICKS(100));
      digitalWrite(BUILT_LED, LOW);
    }
  }

  WiFi_IP = WiFi.localIP().toString();
  Serial.println("Connected to WiFi:");
  Serial.println("         IP: " + String(WiFi_IP));
  Serial.println("   Hostname: " + myHostname);
  long rssi = WiFi.RSSI();
  Serial.print("     Signal: ");
  Serial.print(rssi);
  Serial.println(" dBm");
}
</code>
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[[inne:sygnal_wifi#poziomy_dbm|Poziomy sygnału dBm]]\\
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===== Kody błędów =====

^ WL_NO_SHIELD | 255 | assigned when no WiFi shield is present |
^ WL_IDLE_STATUS | 0 | it is a temporary status assigned when WiFi.begin() is called and remains active until the number of attempts expires (resulting in WL_CONNECT_FAILED) or a connection is established (resulting in WL_CONNECTED) |
^ WL_NO_SSID_AVAIL | 1 | assigned when no SSID are available |
^ WL_SCAN_COMPLETED | 2 | assigned when the scan networks is completed |
^ WL_CONNECTED | 3  | assigned when connected to a WiFi network |
^ WL_CONNECT_FAILED | 4 | assigned when the connection fails for all the attempts |
^ WL_CONNECTION_LOST | 5 | assigned when the connection is lost |
^ WL_DISCONNECTED | 6 | assigned when disconnected from a network |