WiFiConfigTest.ino

#include <ESP8266WiFi.h>
#include <FS.h>
#include <ESP8266WebServer.h>


void startSoftAP() {
  Serial.println("startSoftAP");
  WiFi.mode(WIFI_AP);
  WiFi.softAP("ESPAP");
  ESP8266WebServer server;
  bool configDone = false;
  String ssid;
  String pass;
  server.serveStatic("/", SPIFFS, "/index.html");
  server.on("/config", [&]() {
    Serial.println("config");
    ssid = server.arg("ssid");
    pass = server.arg("pass");
    Serial.print("SSID: ");
    Serial.print(ssid);
    Serial.print("pass: ");
    Serial.println(pass);
    configDone = true;
    server.send(200, "text/plain", "ok");
  });
  server.begin();

  while (!configDone) {
    server.handleClient();
  }
  Serial.println("Config is done, trying to connect:");
  tryToConnect(ssid, pass);
  
}

void tryToConnect(String ssid, String pass) {
  int start = millis();
  const int timeout = 10000;
  Serial.println();
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid.c_str(), pass.c_str());
  while (WiFi.status() != WL_CONNECTED && millis() - start < timeout) {
    delay(500);
    Serial.print('.');
  }
  Serial.println();
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Connection failed");
  }
  else {
    Serial.println("Connected!");
  }
}


void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  delay(1000);
  Serial.println();
  Serial.println("Starting....");
  if (!SPIFFS.begin()) {
    Serial.println("Failed to mount filesystem");
  }

  Dir root = SPIFFS.openDir("/");
  while (root.next()) {
    Serial.println(root.fileName());
  }

  if (WiFi.SSID().length() > 0) {
    Serial.print("We have SSID saved: ");
    Serial.println(WiFi.SSID());
    tryToConnect(WiFi.SSID(), WiFi.psk());
  }
  
  while (WiFi.status() != WL_CONNECTED) {
    Serial.println("Not connected, starting SOFTAP");
    startSoftAP();
  }

  Serial.println("Finally connected");
}

void loop() {


}