/*
 * ESP8266 wifi module Interfacing with Arduino Uno
 * http://www.electronicwings.com
 */ 
// #include "ESP8266_AT.h"

 /* Select Demo */
//#define RECEIVE_DEMO      /* Define RECEIVE demo */
#define SEND_DEMO     /* Define SEND demo */

/* Define Required fields shown below */
#define DOMAIN          "api.thingspeak.com"
#define PORT            "80"
#define API_WRITE_KEY   "Write your Write Key here"
#define CHANNEL_ID      "Write your Channel ID here"

#define SSID            "Livebox-37cc"
#define PASSWORD        "8A6060920A8A86896F770F2C47"

char _buffer[150];
uint8_t Connect_Status;
#ifdef SEND_DEMO
uint8_t Sample = 0;
#endif

void setup() {
    Serial.begin(9600);
 
    while(!ESP8266_Begin());
    ESP8266_WIFIMode(BOTH_STATION_AND_ACCESPOINT);  /* 3 = Both (AP and STA) */
    ESP8266_ConnectionMode(SINGLE);           /* 0 = Single; 1 = Multi */
    ESP8266_ApplicationMode(NORMAL);          /* 0 = Normal Mode; 1 = Transperant Mode */
    if(ESP8266_connected() == ESP8266_NOT_CONNECTED_TO_AP)/*Check WIFI connection*/
    ESP8266_JoinAccessPoint(SSID, PASSWORD);    /*Connect to WIFI*/
    ESP8266_Start(0, DOMAIN, PORT); 
}

void loop() {
    Connect_Status = ESP8266_connected();
    if(Connect_Status == ESP8266_NOT_CONNECTED_TO_AP) /*Again check connection to WIFI*/
    ESP8266_JoinAccessPoint(SSID, PASSWORD);    /*Connect to WIFI*/
    if(Connect_Status == ESP8266_TRANSMISSION_DISCONNECTED)
    ESP8266_Start(0, DOMAIN, PORT);     /*Connect to TCP port*/

    #ifdef SEND_DEMO
    memset(_buffer, 0, 150);
    sprintf(_buffer, "GET /update?api_key=%s&field1=%d", API_WRITE_KEY, Sample++);  /*connect to thingspeak server to post data using your API_WRITE_KEY*/
    ESP8266_Send(_buffer);
    delay(15000);           /* Thingspeak server delay */
    #endif
    
    #ifdef RECEIVE_DEMO
    memset(_buffer, 0, 150);
    sprintf(_buffer, "GET /channels/%s/feeds/last.txt", CHANNEL_ID); /*Connect to thingspeak server to get data using your channel ID*/
    ESP8266_Send(_buffer);
    Read_Data(_buffer);
    delay(600);
    #endif
  }