I like to configure my ESP8266 with WiFiManager. After each power cycle, the config portal should open and wait for a new configuration. If there is no new configuration entered, WiFiManager should autoconnect with the last/old configuration.

For this I modified AutoConnectWithFSParametersAndCustomIP.ino slightly as you can see here:

#include <FS.h>                   //this needs to be first, or it all crashes and burns...

#include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino

//needed for library
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager

#include <ArduinoJson.h>          //https://github.com/bblanchon/ArduinoJson

//define your default values here, if there are different values in config.json, they are overwritten.
//length should be max size + 1 
char mqtt_server[40];
char mqtt_port[6] = "8080";
char blynk_token[33] = "YOUR_BLYNK_TOKEN";
//default custom static IP
char static_ip[16] = "";
char static_gw[16] = "";
char static_sn[16] = "";

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;

void setup() {
  // put your setup code here, to run once:

  //clean FS, for testing

  //read configuration from FS json
  Serial.println("mounting FS...");

  if (SPIFFS.begin()) {
    Serial.println("mounted file system");
    if (SPIFFS.exists("/config.json")) {
      //file exists, reading and loading
      Serial.println("reading config file");
      File configFile = SPIFFS.open("/config.json", "r");
      if (configFile) {
        Serial.println("opened config file");
        size_t size = configFile.size();
        // Allocate a buffer to store contents of the file.
        std::unique_ptr<char[]> buf(new char[size]);

        configFile.readBytes(buf.get(), size);
        DynamicJsonBuffer jsonBuffer;
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        if (json.success()) {
          Serial.println("\nparsed json");

          strcpy(mqtt_server, json["mqtt_server"]);
          strcpy(mqtt_port, json["mqtt_port"]);
          strcpy(blynk_token, json["blynk_token"]);

          if(json["ip"]) {
            Serial.println("setting custom ip from config");
            //static_ip = json["ip"];
            strcpy(static_ip, json["ip"]);
            strcpy(static_gw, json["gateway"]);
            strcpy(static_sn, json["subnet"]);
            //strcat(static_ip, json["ip"]);
            //static_gw = json["gateway"];
            //static_sn = json["subnet"];
/*            Serial.println("converting ip");
            IPAddress ip = ipFromCharArray(static_ip);
          } else {
            Serial.println("no custom ip in config");
        } else {
          Serial.println("failed to load json config");
  } else {
    Serial.println("failed to mount FS");
  //end read

  // The extra parameters to be configured (can be either global or just in the setup)
  // After connecting, parameter.getValue() will get you the configured value
  // id/name placeholder/prompt default length
  WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
  WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 5);
  WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 34);

  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wifiManager;

  //set config save notify callback

  //set static ip
  IPAddress _ip,_gw,_sn;

  wifiManager.setSTAStaticIPConfig(_ip, _gw, _sn);

  //add all your parameters here

  //reset settings - for testing

  //set minimu quality of signal so it ignores AP's under that quality
  //defaults to 8%

  //sets timeout until configuration portal gets turned off
  //useful to make it all retry or go to sleep
  //in seconds

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.startConfigPortal("AutoConnectAP", "password")) {
    Serial.println("failed to connect and hit timeout");
    //reset and try again, or maybe put it to deep sleep

  //if you get here you have connected to the WiFi
  Serial.println("connected...yeey :)");

  //read updated parameters
  strcpy(mqtt_server, custom_mqtt_server.getValue());
  strcpy(mqtt_port, custom_mqtt_port.getValue());
  strcpy(blynk_token, custom_blynk_token.getValue());

  //save the custom parameters to FS
  if (shouldSaveConfig) {
    Serial.println("saving config");
    DynamicJsonBuffer jsonBuffer;
    JsonObject& json = jsonBuffer.createObject();
    json["mqtt_server"] = mqtt_server;
    json["mqtt_port"] = mqtt_port;
    json["blynk_token"] = blynk_token;

    json["ip"] = WiFi.localIP().toString();
    json["gateway"] = WiFi.gatewayIP().toString();
    json["subnet"] = WiFi.subnetMask().toString();

    File configFile = SPIFFS.open("/config.json", "w");
    if (!configFile) {
      Serial.println("failed to open config file for writing");

    //end save

  Serial.println("local ip");

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


My Problem is, that it does not connect after timeout. Only the config portal is closed.

What do I need to change, so that it automatically connects after timeout?

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