arduino-esp32/libraries/WiFi/examples/WiFiClientEvents/WiFiClientEvents.ino

/*
 *  This sketch shows the WiFi event usage
 *
*/

/* 
* WiFi Events

SYSTEM_EVENT_WIFI_READY               < ESP32 WiFi ready
SYSTEM_EVENT_SCAN_DONE                < ESP32 finish scanning AP
SYSTEM_EVENT_STA_START                < ESP32 station start
SYSTEM_EVENT_STA_STOP                 < ESP32 station stop
SYSTEM_EVENT_STA_CONNECTED            < ESP32 station connected to AP
SYSTEM_EVENT_STA_DISCONNECTED         < ESP32 station disconnected from AP
SYSTEM_EVENT_STA_AUTHMODE_CHANGE      < the auth mode of AP connected by ESP32 station changed
SYSTEM_EVENT_STA_GOT_IP               < ESP32 station got IP from connected AP
SYSTEM_EVENT_STA_LOST_IP              < ESP32 station lost IP and the IP is reset to 0
SYSTEM_EVENT_STA_WPS_ER_SUCCESS       < ESP32 station wps succeeds in enrollee mode
SYSTEM_EVENT_STA_WPS_ER_FAILED        < ESP32 station wps fails in enrollee mode
SYSTEM_EVENT_STA_WPS_ER_TIMEOUT       < ESP32 station wps timeout in enrollee mode
SYSTEM_EVENT_STA_WPS_ER_PIN           < ESP32 station wps pin code in enrollee mode
SYSTEM_EVENT_AP_START                 < ESP32 soft-AP start
SYSTEM_EVENT_AP_STOP                  < ESP32 soft-AP stop
SYSTEM_EVENT_AP_STACONNECTED          < a station connected to ESP32 soft-AP
SYSTEM_EVENT_AP_STADISCONNECTED       < a station disconnected from ESP32 soft-AP
SYSTEM_EVENT_AP_PROBEREQRECVED        < Receive probe request packet in soft-AP interface
SYSTEM_EVENT_GOT_IP6                  < ESP32 station or ap or ethernet interface v6IP addr is preferred
SYSTEM_EVENT_ETH_START                < ESP32 ethernet start
SYSTEM_EVENT_ETH_STOP                 < ESP32 ethernet stop
SYSTEM_EVENT_ETH_CONNECTED            < ESP32 ethernet phy link up
SYSTEM_EVENT_ETH_DISCONNECTED         < ESP32 ethernet phy link down
SYSTEM_EVENT_ETH_GOT_IP               < ESP32 ethernet got IP from connected AP
SYSTEM_EVENT_MAX
*/

#include <WiFi.h>

const char* ssid     = "your-ssid";
const char* password = "your-password";


void WiFiEvent(WiFiEvent_t event)
{
    Serial.printf("[WiFi-event] event: %d\n", event);

    switch (event)
    {
    case SYSTEM_EVENT_STA_GOT_IP:
        Serial.println("WiFi connected");
        Serial.println("IP address: ");
        Serial.println(WiFi.localIP());
        break;
    case SYSTEM_EVENT_STA_DISCONNECTED:
        Serial.println("WiFi lost connection");
        break;
    }
}

void WiFiGotIP(WiFiEvent_t event, WiFiEventInfo_t info)
{
    Serial.println("WiFi connected");
    Serial.println("IP address: ");
    Serial.println(IPAddress(info.got_ip.ip_info.ip.addr));
}

void setup()
{
    Serial.begin(115200);

    // delete old config
    WiFi.disconnect(true);

    delay(1000);

    // Examples of diffrent ways to register wifi events
    WiFi.onEvent(WiFiEvent);
    WiFi.onEvent(WiFiGotIP, WiFiEvent_t::SYSTEM_EVENT_STA_GOT_IP);
    WiFiEventId_t eventID = WiFi.onEvent([](WiFiEvent_t event, WiFiEventInfo_t info){
        Serial.print("WiFi lost connection. Reason: ");
        Serial.println(info.disconnected.reason);
    }, WiFiEvent_t::SYSTEM_EVENT_STA_DISCONNECTED);

    // Remove WiFi event
    Serial.print("WiFi Event ID: ");
    Serial.println(eventID);
    // WiFi.removeEvent(eventID);

    WiFi.begin(ssid, password);

    Serial.println();
    Serial.println();
    Serial.println("Wait for WiFi... ");
}

void loop()
{
    delay(1000);
}