#include <WiFi.h>
#include <HTTPClient.h>
 
const char* ssid = "Wokwi-GUEST";
const char* password = "";
 
String talkbacks_id = "52316";
String command_id =    "41530336";
String talkbacks_api = "DT3WN6FNS6GKQPHA";
String command_string="";
 
void GETcommand()
{
        HTTPClient http;    
 
        Serial.print("[HTTP] begin...\n");
        //"http://api.thingspeak.com/talkbacks/35233/commands/16599915.json?api_key=0E1160BEX9CSNU6V"
        String url = "http://api.thingspeak.com/talkbacks/";
               url += talkbacks_id;  
               url += "/commands/";
               url += command_id;
               url += ".json?api_key=";
               url += talkbacks_api;
        http.begin(url); //HTTP
 
        Serial.print("[HTTP] GET...\n");
 
        // start connection and send HTTP header
        int httpCode = http.GET();
 
        // httpCode will be negative on error
 
        if(httpCode > 0) {
            // HTTP header has been send and Server response header has been handled
            Serial.printf("[HTTP] GET... code: %d\n", httpCode);
 
            // file found at server
                     if(httpCode == HTTP_CODE_OK) {
                String payload = http.getString();
                Serial.println(payload);
                int index_start = payload.indexOf("command_string\":\"") + 17;
                int index_stop = payload.indexOf("\",\"position");
                command_string = payload.substring(index_start, index_stop);
                Serial.println(command_string);            
            }
        } 
        else 
        {
            Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
        }
 
        http.end();
 
    delay(1000);
}
 
void connectWifi (const char* ssid, const char* password)
{
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println("Connected to WiFi");
}
 
void setup() {
  Serial.begin(115200);
 
  // Connect to Wi-Fi
  connectWifi(ssid, password);
  pinMode(2, OUTPUT);
 
 
}
 
void loop() {
        GETcommand();
        if(command_string == "LEDOFF")
            {
              digitalWrite(2, LOW);//turn on the LED
            }
        else if(command_string == "LEDON")
            {
              digitalWrite(2, HIGH);// turn on the LED
            }
            delay(1000);
}