#include <SPI.h>

#include <MFRC522.h>

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#include <SPI.h>
#include <Ethernet.h>

#include<ArduinoJson.h>

#include<SoftwareSerial.h>

LiquidCrystal_I2C lcd(0×3f, 16, 2);

int RST_PIN = 9;

int SS_PIN = 10;
char* json;
MFRC522 rfid(SS_PIN, RST_PIN);

IPAddress ip(192, 168, 0, 177);
IPAddress myDns(192, 168, 0, 1);
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

char server[] = “192.168.1.7”;

EthernetClient client;

String kartNumarasi="";

SoftwareSerial mySerial(5, 6);

void setup() {

mySerial.begin(9600);

Serial.begin(9600);

SPI.begin();

rfid.PCD_Init();

lcd.begin();
lcd.backlight();

// start the Ethernet connection:
Serial.println(“Initialize Ethernet with DHCP:”);
if (Ethernet.begin(mac) == 0) {
Serial.println(“Failed to configure Ethernet using DHCP”);
// Check for Ethernet hardware present
if (Ethernet.hardwareStatus() == EthernetNoHardware) {
Serial.println(“Ethernet shield was not found. Sorry, can’t run without hardware. 🙁”);
while (true) {
delay(1); // do nothing, no point running without Ethernet hardware
}
}
if (Ethernet.linkStatus() == LinkOFF) {
Serial.println(“Ethernet cable is not connected.”);
}
// try to congifure using IP address instead of DHCP:
Ethernet.begin(mac, ip, myDns);
} else {
Serial.print(“ DHCP assigned IP ”);
Serial.println(Ethernet.localIP());
}
// give the Ethernet shield a second to initialize:
delay(1000);
Serial.print(“connecting to ”);
Serial.print(server);
Serial.println(“…”);

}

void loop() {
kartNumarasi="";
if (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial())

{
kartNumarasi="";
lcd.clear();
for(int sayac = 0; sayac < 4; sayac++){
kartNumarasi = kartNumarasi + rfid.uid.uidByte[sayac];
}

if (client.connect(server, 80)) {
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: application/json");
  client.println("Host: 192.168.1.7");
  client.println("Connection: keep-alive");
  client.println("Access-Control-Allow-Origin: *");
  client.println();
 
  client.print("{");
  client.print("\"kartNumarasi\":");
  client.print("\"");
  client.print(kartNumarasi);
  client.print("\"");
  client.print(',');
  client.print("\"cihazIp\":");

  client.print("\"");
  client.print(ip);
  client.print("\"");
  client.println("}");

  if (client.available())
  {
    json = client.read();
     DynamicJsonDocument doc(1024);
     deserializeJson(doc, json);
     char* durum = doc["durum"];
    if(durum == "ac")
    {
         lcd.print("onaylandı");
         mySerial.print("A");
         delay(5000);
         mySerial.print("a");
    }
    if(durum == "acma"){
        lcd.print("reddedildi");
    }
    
  }
  else {
    Serial.println("Sunucu verisi yoktur");
  }
  
}
else {
  Serial.println("Bağlantı hatası");
}

client.flush();
client.stop();

}

rfid.PICC_HaltA();
}