#include "DHT.h"
#define DHTPIN 8
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#include <SoftwareSerial.h>
SoftwareSerial esp8266(2, 3);

void setup() {
  // put your setup code here, to run once:
  esp8266.begin(115200);
  Serial.begin(115200);
  esp8266.println("AT+RST");
  esp8266.println("AT+RESTORE");
  esp8266.println("AT+RST");
}

unsigned long enviaDados = millis();
unsigned short int contador = 0;

void loop() {
  if (espConfig())
  {
    while (senData(dht.readTemperature(), dht.readHumidity()))
    {
      Serial.println(" entrou while -->");
      delay(10000);
    }
  } else  delay(3000);

}


bool espConfig() {
  waitAndEcho(3000, "......");
  Serial.println(" INICIO CONFIG ===============================");
  Serial.println("1-> AT+RST");
  esp8266.println("AT+RST");
  waitAndEcho(5000, "OK\r\n");

  Serial.println("2-> AT+CWMODE_CUR=3");
  esp8266.println("AT+CWMODE_CUR=1");
  waitAndEcho(500, "\r\nOK");

  Serial.println("3-> AT+CIPSTA_CUR=\"192.168.2.223\",\"192.168.1.5\",\"255.255.252.0\"");
  esp8266.println("AT+CIPSTA_CUR=\"192.168.2.223\",\"192.168.1.5\",\"255.255.252.0\"");
  waitAndEcho(4000, "\r\nOK");

  Serial.println("4-> AT+CWJAP_CUR=\"rede\",\"senha\"");
  esp8266.println("AT+CWJAP_CUR=\"rede\",\"senha\"");
  waitAndEcho(15000, "\r\nOK");

  Serial.println("5-> AT+CIPMUX=0");
  esp8266.println("AT+CIPMUX=0");
  waitAndEcho(500, "\r\nOK");

  Serial.println("6-> AT+CIPSTART=\"TCP\",\"52.8.0.240\",80");
  esp8266.println("AT+CIPSTART=\"TCP\",\"52.8.0.240\",80");
  waitAndEcho(5000, "OK\r\n");

  Serial.println(" FIM CONFIG ===============================");
  return true;
}

bool senData(double temp, double umid) {
  String values = "temp=" + String(temp) + "&umid=" + String(umid);
  String postString = "POST /onep:v1/stack/alias HTTP/1.1\r\n"
                      "Host: m2.exosite.com\r\n"
                      "X-Exosite-CIK: xxxxxxxxxxx\r\n"
                      "Content-Type: application/x-www-form-urlencoded; charset=utf-8\r\n"
                      "Content-Length: [LEN]\r\n"
                      "\r\n"
                      "[VALUE]\r\n";

  postString.replace("[LEN]", String(values.length()));
  postString.replace("[VALUE]", values);

  Serial.println("7-> AT+CIPSEND=" + String(postString.length()));
  esp8266.println("AT+CIPSEND=" + String(postString.length()));
  if (waitAndEcho(500, "OK\r\n")) {

    Serial.println("8-> " + String(postString));
    esp8266.print(postString);
    return waitAndEcho(10000, "\r\nSEND");

  }

  return false;

}

bool waitAndEcho(int t, String s) {
  String buffer;
  unsigned long start = millis();
  unsigned long last = 0;
  unsigned int n = s.length();
  bool ret = false;
  do {
    if (esp8266.available()) {
      buffer += (char)esp8266.read();
      last = millis();
      if (buffer.length() >= n) {
        if (buffer.substring(buffer.length() - n).equals(s)) {
          ret = true;
          break;
        }
      }
    }

  } while (millis() < start + t);
  buffer.replace("\r", "\\r");
  buffer.replace("\n", "\\n");
  Serial.println(String(ret ? "+" : "-") + "(" + String(last - start) + "/" + String(t) + "):" + buffer);
  return ret;
}