Car tracking with Wemos D1 mini

#include <ESP8266WiFi.h>
#include <WiFiClient.h> 
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
const char *ssid = "YOUR WLAN SSID";
const char *password = "YOUR WLAN PASSWORD";
const char *host = "YOURDOMAIN.com";// Domain only!
// !!!!!! 
//Change your Website-Password for POST on row 111 
//Change your URL for HTTP-Request on row 117

// GPS-MODUL
#include <TinyGPS++.h>
#include <SoftwareSerial.h>
TinyGPSPlus gps;
SoftwareSerial ss(4, 5);// GPIO4 und GPIO5 (PIN D1 und D2)
float latitude , longitude;
String lat_str , lng_str;

// Timer for Send Data:
unsigned long previousMillis = 0;
const long interval = 120000;//2-Min.Send to Server

//=======================================================================
//                    Setup
//=======================================================================
 
void setup() {
    //LEDs:
  pinMode(12, OUTPUT); digitalWrite(12, LOW);//LED an D6: Valid GPS Data
  pinMode(14, OUTPUT); digitalWrite(14, LOW);//LED an D5: Send to Server
  pinMode(16, OUTPUT); digitalWrite(16, LOW);//LED an D0: WLAN OK
  
  delay(1000);
  // Serial:
Serial.begin(115200);
  // CONNECT WLAN:
  WiFi.mode(WIFI_OFF);
  delay(1000);
  WiFi.mode(WIFI_STA); 
  WiFi.begin(ssid, password);
Serial.println(""); 
Serial.print("Connecting");
  // Wait for connection ...
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
Serial.print(".");
  }

Serial.println("");
Serial.print("Connected SSID: ");
Serial.println(ssid);
Serial.print("Lokal-IP: ");
Serial.println(WiFi.localIP());

  // SoftwareSerial:
  ss.begin(9600);
}
 
//=======================================================================
//                    Main Program Loop
//=======================================================================

void loop() {

  // WLAN is connected (for LED only)
  if (WiFi.status() != WL_CONNECTED)
  {
  digitalWrite(16, LOW);    
  }else{
   digitalWrite(16, HIGH);   
  }

  // GPS:
  while (ss.available() > 0)
    if (gps.encode(ss.read()))
    { 
      if (gps.location.isValid())
      {
Serial.println("Location is valid ...");
digitalWrite(12, HIGH); 
        latitude = gps.location.lat();
        lat_str = String(latitude , 6);
Serial.print("LAT:");
Serial.println(lat_str);        
        longitude = gps.location.lng();
        lng_str = String(longitude , 6);
Serial.print("LNG:"); 
Serial.println(lng_str);       
      }else{
digitalWrite(12, LOW);        
      }
    }

// Millis for Send-Data-Function:
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    senddata(lat_str, lng_str);
    digitalWrite(14, HIGH);
    delay(500);
    digitalWrite(14, LOW);
    }
}

//=======================================================================
//                    Send Data to Server
//=======================================================================

void senddata(String lat_str, String lng_str){
  HTTPClient http;
  String pass, postData;
  pass = "YOUR WEBSITE PASSWORD";//for accept POST on gps.php on server
 
  postData = "gps_data_lat=" + lat_str + "&gps_data_lng=" + lng_str +"&pass=" + pass ;
  //Change the complete URL for HTTP-Request:
  http.begin("https://YOURDOMAIN.com/GPS/gps.php");
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
 
  int httpCode = http.POST(postData);
  String payload = http.getString();

Serial.print("............... Http-Code:");
Serial.println(httpCode);   //Print HTTP return code
Serial.print("............... Request Response:");
Serial.println(payload);    //Print request response
 
  http.end();  //Close connection  
}