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#include <WiFi.h>

void setup() {
  Serial.begin(500000);
}

char *hostName = "myhost";
char *hostPassword = "";
char *ssid = "your-ssid";
char *password = "your-password";
static char *oldssid = ssid;
int connected = 0;

void refresh(bool firstTime) {
  static bool Connected = false;
  static bool tryAgain = false;
  static int cnt = 0;

  connected = WiFi.status() ==  WL_CONNECTED || WiFi.isConnected();

  // runs this only once
  if (firstTime) {
    WiFi.mode(WIFI_AP_STA);
    WiFi.softAP(hostName, hostPassword, 10);
    Serial.printf("setting %s with %s\n", hostName, hostPassword);
    connected = false;
    tryAgain = true;
  }

  // if the ssid changed then reconnect
  if (ssid != oldssid) {
    oldssid = ssid;
    tryAgain = true;
  }

  // this runs when we change something
  if (tryAgain) {
    tryAgain = false;
    connected = false;
    cnt = 0;
    if (ssid != "" && password == "") {
      Serial.printf("Connecting to %s without password\n", ssid);
      WiFi.disconnect();
      WiFi.begin(ssid);
    }
    else if (ssid != "" && password != "") {
      Serial.printf("Connecting to %s with password\n", ssid);
      WiFi.disconnect();
      WiFi.begin(ssid, password);
    }
    else {
      Serial.printf("huh??\n");
      WiFi.disconnect();
      WiFi.begin();
    }
  }
}

void loop() {
  refresh(true); // runs once
  for (;;) {
    if (millis() / 1000 == 20) { // change the ssid in 20 seconds
      ssid = "tmp";
    }
    if (millis() % 500 == 0) { // show progress
      Serial.printf("%u connected = %u\n", millis() / 1000, connected);
      delay(10);
    }
    refresh(false);
  }
}