WiFiManager/examples/Advanced/Advanced.ino

/**
 * WiFiManager advanced demo, contains advanced configurartion options
 * Implements TRIGGEN_PIN button press, press for ondemand configportal, hold for 3 seconds for reset settings.
 */
#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager

#define TRIGGER_PIN 0

WiFiManager wm;

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);  
  delay(3000);
  Serial.println("\n Starting");

  pinMode(TRIGGER_PIN, INPUT);
   
  // wm.resetSettings(); // wipe settings

  // add a custom input field
  int customFieldLength = 40;
  WiFiManagerParameter custom_field("customfield", "Custom Field", "Default Value", customFieldLength);
  wm.addParameter(&custom_field);

  // custom menu via array or vector
  // 
  // menu tokens, "wifi","wifinoscan","info","param","close","sep","erase","restart","exit" (sep is seperator) (if param is in menu, params will not show up in wifi page!)
  // const char* menu[] = {"wifi","info","param","sep","restart","exit"}; 
  // wm.setMenu(menu,6);
  std::vector<const char *> menu = {"wifi","info","param","sep","restart","exit"};
  wm.setMenu(menu);

  // set dark theme
  // wm.setClass("invert");
  
  //set static ip
  // wm.setSTAStaticIPConfig(IPAddress(10,0,1,99), IPAddress(10,0,1,1), IPAddress(255,255,255,0)); // set static ip,gw,sn
  // wm.setShowStaticFields(true); // force show static ip fields
  // wm.setShowDnsFields(true);    // force show dns field always

  // wm.setConnectTimeout(20); // how long to try to connect for before continuing
  // wm.setConfigPortalTimeout(60); // auto close configportal after n seconds
  // wifiManager.setCaptivePortalEnable(false); // disable captive portal redirection

  // wifi scan settings
  // wm.setRemoveDuplicateAPs(false); // do not remove duplicate ap names (true)
  // wm.setMinimumSignalQuality(20);  // set min RSSI (percentage) to show in scans, null = 8%
  // wm.setShowInfoErase(false);      // do not show erase button on info page
  // wm.setScanDispPerc(true);       // show RSSI as percentage not graph icons
  
  // wm.setBreakAfterConfig(true);   // always exit configportal even if wifi save fails

  bool res;
  // res = wm.autoConnect(); // auto generated AP name from chipid
  // res = wm.autoConnect("AutoConnectAP"); // anonymous ap
  res = wm.autoConnect("AutoConnectAP","password"); // password protected ap

  if(!res) {
    Serial.println("Failed to connect or hit timeout");
    // ESP.restart();
  } 
  else {
    //if you get here you have connected to the WiFi    
    Serial.println("connected...yeey :)");
  }
}

void checkButton(){
  // check for button press
  if ( digitalRead(TRIGGER_PIN) == LOW ) {
    // poor mans debounce/press-hold, not recommended for production code
    delay(50);
    if( digitalRead(TRIGGER_PIN) == LOW ){
    
      // holding button 3000 ms, reset settings
      delay(3000); // reset delay hold
      if( digitalRead(TRIGGER_PIN) == LOW ){
        Serial.println("Erasing Config");
        wm.resetSettings();
        ESP.restart();
      }
      
      // start portal w delay
      Serial.println("Starting config portal");
      wm.setConfigPortalTimeout(120);
      
      if (!wm.startConfigPortal("OnDemandAP")) {
        Serial.println("failed to connect or hit timeout");
        delay(3000);
        // ESP.restart();
      } else {
        //if you get here you have connected to the WiFi
        Serial.println("connected...yeey :)");
      }
    }
  }
}

void loop() {
  checkButton();
  // put your main code here, to run repeatedly:
}