ESP8266 Community Forum

- Mon Mar 06, 2017 8:38 pm #63436 Hi friends, i have code to Post data to website and get data from website. I want post data reading from NFCcard using ESP8266 and arduino and after post i want to get reply from server that ID has registered or not from database. I have already tested and work if only using get or post. If im using "get code" i got a reply. If im using "post code" i can posted to website.

The problem is if i want to combine post and get data together. Post code cannot get data.length and always 0 value. So i cannot post data to website.

This is my code. Can you help me?

Code: Select all
#if 1
#include <SPI.h>
#include <PN532_SPI.h>
#include "PN532.h"

PN532_SPI pn532spi(SPI, 10);
PN532 nfc(pn532spi);
#elif 0
#include <PN532_HSU.h>
#include <PN532.h>

PN532_HSU pn532hsu(Serial);
PN532 nfc(pn532hsu);
#else
#include <Wire.h>
#include <PN532_I2C.h>
#include <PN532.h>
#include <NfcAdapter.h>

PN532_I2C pn532i2c(Wire);
PN532 nfc(pn532i2c);
#endif

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

int relay = 7; //deklarasi pin relay (7)
String ssid = "tethering"; // Nama SSID Akses point
String password = "password"; // Password akses point
String data;
String server = "www.myweb.com"; // domain
String uri = "/nfcpost.php";// file php di server

int reRequest = 0;
int doorlock = 5; // Deklarasi pin relay
int sameData = 0;

// Modulo I2C display no endereco 0x27
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

byte zero = 0x00;

byte data1, data2, data3, data4, data5, data6, data7;
String dat1, dat2, dat3, dat4, dat5, dat6, dat7;
String id;
byte readCard[20];
String temp_id;
byte byteArray[20];
int sending = 0;
int sent = 0;
int gett = 0;

void setup() {
  // Serial.begin(115200); //deklarasi proses komunikasi serial
  Serial.begin(115200);
  delay(200);
  pinMode(doorlock, OUTPUT);
  delay(100);
  digitalWrite(doorlock, LOW);
  nfc.begin();
  lcd.begin (16, 2);

  uint32_t versiondata = nfc.getFirmwareVersion();
  if (! versiondata) {
    // Serial.print("Didn't find PN53x board");
    lcd.setCursor(0, 0);
    lcd.print("NFC Reader");
    lcd.setCursor(0, 1);
    lcd.print("Tidak ditemukan");
    delay(500);
    //  lcd.clear();
    while (1); // halt
  }
  // Got ok data, print it out!
  //Serial.print("Found chip PN5"); Serial.println((versiondata >> 24) & 0xFF, HEX);

  lcd.setCursor(0, 0);
  lcd.print("NFC Reader setup");
  delay(500);
  //  lcd.clear();//Serial.print("Firmware ver. "); Serial.print((versiondata >> 16) & 0xFF, DEC);
  lcd.print((versiondata >> 16) & 0xFF, DEC);
  delay(500);
  lcd.clear();// Serial.print('.'); Serial.println((versiondata >> 8) & 0xFF, DEC);

  // Set the max number of retry attempts to read from a card
  // This prevents us from waiting forever for a card, which is
  // the default behaviour of the PN532.
  nfc.setPassiveActivationRetries(0xFF);

  // configure board to read RFID tags
  nfc.SAMConfig();
  reset();
  connectWifi();
  delay(2000); // tunda waktu 2 detik supaya stabil
}

void loop() {
  readNFC();

  if (sent == 1) {
    httppost ();
    sent = 0;
  }

  if (gett == 1) {
    httpget();
    gett = 0;
    id = "";
  }
  // if (sameData == 1) {
  //  httpget();
  //  lcd.setCursor(0, 0);
  //  lcd.print("Data sama");
  //  delay(5000);
  // }
}


void readNFC() {
  lcd.setCursor(0, 0);
  lcd.print("Tempelkan");
  lcd.setCursor(0, 1);
  lcd.print("NFC anda");
  boolean success;
  uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 }; // Buffer to store the returned UID
  uint8_t uidLength; // Length of the UID (4 or 7 bytes depending on ISO14443A card type)

  // Wait for an ISO14443A type cards (Mifare, etc.). When one is found
  // 'uid' will be populated with the UID, and uidLength will indicate
  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &uid[0], &uidLength);

  if (success) {
    //  Serial.println("Found a card!");
    lcd.setCursor(0, 0);
    lcd.print("NFC terdeteksi=");
    delay(500);
    //  Serial.print("UID Length: "); Serial.print(uidLength, DEC); Serial.println(" bytes");
    //  Serial.println("UID Value: ");
    //  char x[20];
    //  String s;
    for (uint8_t i = 0; i < uidLength; i++)
    {
      //  Serial.print(" Data ke "); Serial.print(i);
      //    Serial.print(" 0x"); Serial.println(uid[i]);
      if (i == 0) data1 = uid[i];
      if (i == 1) data2 = uid[i];
      if (i == 2) data3 = uid[i];
      if (i == 3) data4 = uid[i];
      if (i == 4) data5 = uid[i];
      if (i == 5) data6 = uid[i];
      if (i == 6) data7 = uid[i];
      readCard[i] = uid[i];
      temp_id = String(readCard[i], DEC);
      id += temp_id;
    }
    lcd.setCursor(0, 1);
    lcd.print(id);
    delay(500);
    lcd.clear();
    // Serial.println("");
    // Wait 1 second before continuing
    // if ((data1 == 83) && (data2 == 231) == (data3 == 163) && (data4 == 148) && (data5 == 0) && (data6 == 154) && (data7 == 0)) digitalWrite(13, HIGH);
    // delay(1000);
    data = "nfc=" + id + "";
    // data = "nfc=123";
    // Serial.print("Mengirim id=");
    // Serial.println(id);
    lcd.setCursor(0, 0);
    lcd.print("Mengirim id=");
    delay(500);
    lcd.setCursor(0, 1);
    lcd.print(id);
    delay(500);
    lcd.clear();
    //   httppost ();
    //    if(sameData==1){
    //      httpget();
    //    }

    //Serial.println(data1);
    //Serial.println(data2);
    //Serial.println(data3);
    //Serial.println(data4);
    sent = 1;
  }
  else
  {
    // PN532 probably timed out waiting for a card
    // Serial.println("Timed out waiting for a card");
    digitalWrite(13, LOW);
  }
}


void reset() {
resetAgain:
  Serial.println("AT+RST"); // AT Command untuk reset Serial28266

  delay(1000);

  if (Serial.find("OK") )// Serial.println("Module Reset");
    int zer = 0;
  else {
    goto resetAgain;
  }
}

//Proses menghubungkan ke akses point

void connectWifi() {
  lcd.setCursor(0, 0);
  lcd.print("Mengubungkan");
  lcd.setCursor(0, 1);
  lcd.print("ke server...");
  delay(2000);
  lcd.clear();
  String cmd = "AT+CWJAP=\"" + ssid + "\",\"" + password + "\"";

  Serial.println(cmd);

  delay(4000);

  if (Serial.find("OK")) {

    //  Serial.println("Connected!");
    lcd.setCursor(0, 0);
    lcd.print("Terhubung");
    lcd.setCursor(0, 1);
    lcd.print("ke server");
    delay(2000);
    lcd.clear();

  }

  else {
    connectWifi();
    //Serial.println("Cannot connect to wifi");
  }

}

void httpget () { // Proses mengirim nilai sensor ke server
  lcd.setCursor(0, 0);
  lcd.print("Mohon tunggu...");
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += server;
  cmd += "\",80";
  Serial.println(cmd);
  if (Serial.find("Error")) return;
  cmd = "GET /nfc.php";
  cmd += " HTTP/1.1\r\n";
  cmd += "Host: ";
  cmd += server;
  cmd += "\r\n";
  cmd += "Connection: close\r\n\r\n";
  delay(10);
  Serial.print("AT+CIPSEND=");
  Serial.println(cmd.length());
  delay(2000);
  Serial.print(cmd);
  // Serial.find("+IPD");
  while (Serial.available())
  {
    lcd.setCursor(0, 0);
    lcd.print("Mohon tunggu...");
    String line = Serial.readString();
    int getIndexStatus = line.indexOf("true");
    int getIndexID = line.indexOf(id);
    if ( getIndexStatus != -1 && getIndexID != -1) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("ID terdaftar");
      lcd.setCursor(0, 1);
      lcd.print("pintu terbuka");
      digitalWrite(doorlock, HIGH);
      delay(1000);
      digitalWrite(doorlock, LOW);
      lcd.clear();
      reRequest = 0;
      goto endGet;
    }
    else {
      reRequest++;
      if (reRequest > 2) {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("ID tidak");
        lcd.setCursor(0, 1);
        lcd.print("terdaftar");
        delay(1000);
        lcd.clear();
        reRequest = 0;
      }
      else {
        lcd.setCursor(0, 0);
        lcd.print("Mohon tunggu...");
        httpget();
      }
    }
  }
endGet:
  delay(1000);
}





void httppost () { // Proses mengirim nilai sensor ke server
sendingAgain:
  Serial.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80");//start a TCP connection.
  if ( Serial.find("OK")) {

  } delay(1000);

  String postRequest =

    "POST " + uri + " HTTP/1.0\r\n" +

    "Host: " + server + "\r\n" +

    "Accept: *" + "/" + "*\r\n" +

    "Content-Length: " + data.length() + "\r\n" +

    "Content-Type: application/x-www-form-urlencoded\r\n" +

    "\r\n" + data;

  String sendCmd = "AT+CIPSEND=";//determine the number of caracters to be sent.

  Serial.print(sendCmd);

  Serial.println(postRequest.length());

  delay(500);

  if (Serial.find(">")) {
    sending++;
    Serial.print(postRequest);
    if ( Serial.find("SEND OK")) {
      sending = 0;
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Data terkirim");
      delay(500);
      lcd.clear();
      while (Serial.available()) {
        //  httpget();
        sameData = 1;
        gett = 1;
        goto endSend;
      }
      //
      //  Serial.println("AT+CIPCLOSE");
    }
    else {
      if (sending >= 5) {
        reset();
        lcd.setCursor(0, 0);
        lcd.print("Reset");
        delay(500);
        lcd.clear();
        sending = 0;
      }
      goto sendingAgain;
    }
  }
  else {
    lcd.setCursor(0, 0);
    lcd.print("Mengirim ulang..");
    delay(500);
    lcd.clear();
    goto sendingAgain;
  }
endSend:
  sameData = 0;
  int zer = 0;
  // httpget();
}



Screenshot if im able post data to website. [Please open image in new tab]


Screenshot if im able to get data from website. [Please open image in new tab]


Screenshot if im cannot get data from website. [Please open image in new tab]