/***************************************************
  This is an example for the Adafruit Thermocouple Sensor w/MAX31855K
 
  Designed specifically to work with the Adafruit Thermocouple Sensor and ledunia
 
  ----> https://www.adafruit.com/products/269
  ----> http://www.ledunia.de
 
  Author: Christian Zeh
 
 ****************************************************/
 
#include <SPI.h>
#include "Adafruit_MAX31855.h"    // Version 1.0.3
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <ESP_Adafruit_SSD1306.h> // Customized version, see attachment
#define OLED_RESET 4
 
byte mac[] = { 0x18, 0xFE, 0x34, 0xEE, 0x40, 0xBF }; //physical mac address
String readString;
 
extern "C" {
#include "user_interface.h"
}
 
#define MAXDO   3  // ledunia (GPIO-3) -> D0
#define MAXCS   14 // ledunia (GPIO 14)-> CS
#define MAXCLK  2  // ledunia (GPIO 2) -> CLK
 
// initialize the Thermocouple
Adafruit_MAX31855 thermocouple(MAXCLK, MAXCS, MAXDO);
 
Adafruit_SSD1306 display(OLED_RESET);
 
//define your wifi credentials:
const char* ssid = "YOUR_SSID";         // Don't forget to change it
const char* password = "YOUR_PASSWORD"; // Don't forget to change it
const char* DNSNAME = "YOUR_DNS_NAME";  // Don't forget to change it
 
MDNSResponder mdns;
 
// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
 
 
//save the tiny bbq icon as array
const unsigned char PROGMEM bbq [] =
{
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x00,
  0x00, 0x00, 0x01, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x03, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x07, 0xFC,
  0x00, 0x00, 0x00, 0x00, 0x1F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x3F, 0xF8, 0x00, 0x00, 0x00, 0x00,
  0x7F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0xFC, 0xF0, 0x00, 0x00, 0x00, 0x01, 0xF8, 0xF0, 0x18, 0x00,
  0x00, 0x01, 0xF8, 0xF0, 0x38, 0x00, 0x00, 0x03, 0xF0, 0xF8, 0x78, 0x00, 0x00, 0x03, 0xF0, 0xFF,
  0xF8, 0x00, 0x00, 0x03, 0xF0, 0xFF, 0xF8, 0x00, 0x00, 0x03, 0xF0, 0x7E, 0x78, 0x00, 0x00, 0x03,
  0xF0, 0x18, 0x78, 0x00, 0x00, 0x03, 0xF0, 0x00, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x0F, 0xFF, 0xFF, 0xFE, 0x00, 0x00, 0x0E, 0x7F, 0xFF, 0xFC, 0x00, 0x00, 0x0C,
  0x1F, 0xFF, 0xFC, 0x00, 0x00, 0x0C, 0x1F, 0xFF, 0xFC, 0x00, 0x00, 0x04, 0x0F, 0xFF, 0xFC, 0x00,
  0x00, 0x06, 0x0F, 0xFF, 0xF8, 0x00, 0x00, 0x03, 0x07, 0xFF, 0xF8, 0x00, 0x00, 0x03, 0x83, 0xFF,
  0xF0, 0x00, 0x00, 0x01, 0xC1, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x71, 0xFF, 0xC0, 0x00, 0x00, 0x00,
  0x3F, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x18, 0xC3, 0x00, 0x00,
  0x00, 0x00, 0x30, 0xC3, 0x80, 0x00, 0x00, 0x00, 0x60, 0xC1, 0x80, 0x00, 0x00, 0x00, 0x60, 0xC0,
  0xC0, 0x00, 0x00, 0x00, 0xC0, 0xC0, 0xC0, 0x00, 0x00, 0x00, 0xC0, 0xC0, 0x60, 0x00, 0x00, 0x01,
  0x80, 0xC0, 0x60, 0x00, 0x00, 0x01, 0x80, 0xC0, 0x30, 0x00, 0x00, 0x01, 0x00, 0xC0, 0x30, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x2B, 0x4F, 0x67,
  0x42, 0x38, 0x7B, 0xEA, 0x86, 0xB2, 0x28, 0xC7,
};
 
 
void setup() {
  Serial.begin(115200);
  Wire.begin(12, 5); //Wire changing because of LED SDA from 4 to 12
  while (!Serial) delay(1); // wait for Serial on Leonardo/Zero, etc
 
  Serial.println("MAX31855 test");
  // wait for MAX chip to stabilize
  delay(500);
 
  WiFi.begin(ssid, password);
  //WiFi.config(ip, gateway, subnet);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    //WiFi.begin(ssid, password);
    Serial.print(".");
  }
 
  if (mdns.begin((DNSNAME), WiFi.localIP())) {
    Serial.println("MDNS responder started");
  }
 
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  // Start the server
  server.begin();
  Serial.println("Server started");
 
  // Print the IP address
  Serial.println(WiFi.localIP());
 
  display.begin(SSD1306_SWITCHCAPVCC, 0x78 >> 1);
  //display.display();
  display.clearDisplay();
  display.drawBitmap( 40, 0, bbq, 48, 48, 1);
  display.display();
  delay(3000);
  display.clearDisplay();
 
}
 
void loop() {
  // basic readout test, just print the current temp
  digitalWrite(LED_BUILTIN, HIGH);
  Serial.print("Internal Temp = ");
  Serial.println(thermocouple.readInternal());
 
  double temperatureC = thermocouple.readCelsius();
  if (isnan(temperatureC)) {
    Serial.println("Something wrong with thermocouple!");
  } else {
    Serial.print("C = ");
    Serial.println(temperatureC);
  }
  Serial.print("F = ");
  Serial.println(thermocouple.readFarenheit());
 
  //get free heap size
  String heap = String(system_get_free_heap_size() / 10);
  // Signalstrength in dBm
  int32_t rssi = wifi_station_get_rssi();
 
  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(5, 1);
  display.println("   PRTG BBQ Meter");
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(10, 20);
  display.print((char)248);
  display.print("C:");
  display.print(temperatureC);
  display.setCursor(5, 40);
  display.setTextSize(1);
  display.print("IP: ");
  display.println(WiFi.localIP());
  display.setCursor(5, 50);
  display.setTextSize(1);
  display.print("dbm: ");
  display.println(rssi);
  display.setCursor(60, 50);
  display.setTextSize(1);
  display.print((char)248);
  display.print("F: ");
  display.println(thermocouple.readFarenheit());
  display.display();
  display.clearDisplay();
  delay(100);
 
  // Create a client connection
  WiFiClient client = server.available();
  if (client) {
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
 
        //read char by char HTTP request
        if (readString.length() < 100) {
 
          //store characters to string
          readString += c;
          //Serial.print(c);
        }
 
        //if HTTP request has ended
        if (c == '\n') {
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: application/json;charset=utf-8");
          client.println("Server: Arduino");
          client.println("Connnection: close");
          client.println();
          client.print("{");
          client.print("\"Temperature_C\": ");
          client.print(temperatureC);
          client.print(", ");
          client.print("\"Temperature_F\": ");
          client.print(thermocouple.readFarenheit());
          client.print(", ");
          client.print("\"rssi\": ");
          client.print(rssi);
          client.print(", ");
          client.print("\"heap\": ");
          client.print(heap);
          client.print("}");
          client.println();
          //stopping client
          client.stop();
          delay(100);
 
        }                     ///c=n
      }                //client available
    }             //client connected
  }         //if client
}      //loop