// https://techtutorialsx.com/2017/05/19/esp32-http-get-requests/

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
  

const char* ssid = "Wokwi-GUEST";
const char* password = "";


// -------------  setup   ----------------
void setup() {
  
  Serial.begin(115200);
  delay(4000);
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }
  
  Serial.println("Connected to the WiFi network");
  Serial.println(WiFi.localIP());
  
}
  

// -------------  loop  POST  ----------------
void loop() {
  
 if(WiFi.status()== WL_CONNECTED){   //Check WiFi connection status
  
   HTTPClient http;   
  
   http.begin("http://jsonplaceholder.typicode.com/posts");  //Specify destination for HTTP request

   // http.addHeader("Content-Type", "text/plain");             //Specify content-type header
   http.addHeader("Content-Type", "application/json");
  
   //int httpResponseCode = http.POST("POSTING from ESP32");   //Send the actual POST request
   int httpResponseCode = http.POST("{ \"tag\": 1 }");
  
   if(httpResponseCode>0){
  
    String response = http.getString();                       //Get the response to the request
  
    Serial.println(httpResponseCode);   //Print return code
    Serial.println(response);           //Print request answer
  
   }else{
  
    Serial.print("Error on sending POST: ");
    Serial.println(httpResponseCode);
  
   }
  
   http.end();  //Free resources
  
 }else{
  
    Serial.println("Error in WiFi connection");   
  
 }
  
  delay(10000);  //Send a request every 10 seconds
  
}




/*

// -------------  loop  GET  ----------------
void loop() {
  
  if ((WiFi.status() == WL_CONNECTED)) { //Check the current connection status
  
    // define a object "http" of class "HTTPClient"
    HTTPClient http;
    JsonDocument jd;
    // char jd_arr[300];
    String jd_arr, andBack;

  
    http.begin("http://jsonplaceholder.typicode.com/comments?id=10"); //Specify the URL
    
    // store "error handling number" to variable
    int httpCode = http.GET();                                        //Make the GET request
  
    // Check for the returning code
    // >1 = status ok
    // <0 = error 
    // https://github.com/espressif/arduino-esp32/blob/master/libraries/HTTPClient/src/HTTPClient.h#L36  = error codes
    if (httpCode > 0) { 
  
        String payload = http.getString();
        Serial.print("httpCode: "); Serial.println(httpCode);             // http error code handling
        Serial.println("payload:"); Serial.println(payload);              // JSON-string = return text

        jd = payload;
        serializeJson (jd, jd_arr);
        Serial.println("payload of jd_arr:"); Serial.println(jd_arr);

        deserializeJson (jd, andBack);
        Serial.println(andBack);
      }
  
    else {
      Serial.println("Error on HTTP request");
    }
  
    http.end(); //Free the resources - close the connection - do not forget to do!
  }
  
  delay(10000);
  
}

*/