#include <stdlib.h>
#include <ArduinoJson.h>

#define SSID "hangar_polivalent" // insert your SSID
#define PASS "p0l1v4l3nc14s" // insert your password

#define WeatherWS_IP "188.226.224.148" //api.openweathermap.org
#define TimeWS_IP "208.113.226.171" //earthtools.org

#define LOCATION "Barcelona" // location
#define LOCATION_LL "41.3871/2.1685" // location longitude/latitude

StaticJsonBuffer<200> jsonBuffer;
  
void setup()
{
  Serial1.begin(9600);
  Serial1.setTimeout(5000);
  Serial.begin(9600); // for debuging
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  Serial.println("Init");

  do{
    Serial1.println("AT+RST");
    Serial.println("WiFi - Module is missing");
    delay(100);
  }
  while(!Serial1.find("ready"));
  Serial.println("WiFi - Module is ready");
  
  // try to connect to wifi
  boolean connected = false;
  for (int i = 0; i < 5; i++) {
    if (connectWiFi()) {
      connected = true;
      break;
    }
  }
  if (!connected) {
    while (1);
  }
  delay(5000);
  Serial1.println("AT+CIPMUX=0"); // set to single connection mode
}
void loop()
{
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += WeatherWS_IP;
  cmd += "\",80";
  Serial1.println(cmd);
    Serial.println(cmd);
  
  if (Serial1.find("Error")) 
    return;
  
  cmd = "GET /data/2.5/weather?q=";
  cmd += LOCATION;
  cmd += " HTTP/1.0\r\nHost: api.openweathermap.org\r\n\r\n";
   
  Serial1.print("AT+CIPSEND=");
  Serial1.println(cmd.length());
  
  if (Serial1.find(">")) {
    Serial.print(">");
  } else {
    Serial1.println("AT+CIPCLOSE");
    Serial.println("connection timeout");
    delay(1000);
    return;
  }
  
  Serial1.print(cmd);
  unsigned int i = 0; //timeout counter
  int n = 1; // char counter
  char json[100] = "{";
  while (!Serial1.find("\"main\":{")) {} // find the part we are interested in.
  while (i < 60000) {
    if (Serial1.available()) {
      char c = Serial1.read();
      json[n] = c;
      if (c == '}') break;
      n++;
      i = 0;
    }
    i++;
  }
  Serial.println(json);
  JsonObject& root = jsonBuffer.parseObject(json);
  if (!root.success()) {
    Serial.println("parseObject() failed");
    return;
  }
  
  double temp = root["temp"];
  temp -= 273.15; 
  
  Serial.println(temp,6);

}
  
boolean connectWiFi()
{
  Serial1.println("AT+CWMODE=1");
  String cmd = "AT+CWJAP=\"";
  cmd += SSID;
  cmd += "\",\"";
  cmd += PASS;
  cmd += "\"";
  Serial.println(cmd);
  Serial1.println(cmd);
  delay(2000);
  if (Serial1.find("OK")) {
    Serial.println("OK, Connected to WiFi.");
    return true;
  } else {
    Serial.println("Can not connect to the WiFi.");
    return false;
  }
}