// ESP32 use http post to run API Blynk
// https://community.blynk.cc/t/esp32-use-http-post-to-run-api-blynk/65887

/* Fill-in information from Blynk Device Info here */
#define BLYNK_TEMPLATE_ID           ""
#define BLYNK_TEMPLATE_NAME         "ESP32LED"
#define BLYNK_AUTH_TOKEN            ""

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

#define LED1_PIN 4
#define LED2_PIN 2
#define SwitchPin1 13  //D13
#ifndef LED_BUILTIN
  #define LED_BUILTIN 2
#endif

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

float humidity=0; // 宣告一個資料型態為float的全域變數humidity
float temperature=0;  // 宣告一個資料型態為float的全域變數temperature
long lastTime = 0 , startTime = 0;
String response;

void SendMessage(String message);

void setup(void) {
  pinMode(LED1_PIN,OUTPUT);
  pinMode(LED2_PIN,OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);  // Initialize the LED_BUILTIN pin as an output
  pinMode(SwitchPin1, INPUT_PULLUP);

  // Debug console
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  delay(4000);   // Delay needed before calling the WiFi.begin

  WiFi.begin(ssid, pass);

  while (WiFi.status() != WL_CONNECTED) { //Check for the connection
    Serial.println("Connecting to WiFi..");
    delay(1000);
  }

  Serial.println("Connected to the WiFi network");
  for(int i=0;i<3;i++)
  {
    digitalWrite(LED_BUILTIN,HIGH);
    delay(1000);
    digitalWrite(LED_BUILTIN,LOW);
    delay(1000);
  }
}

void loop(void) {
  char url[100];

  // if (digitalRead(SwitchPin1) == HIGH) {
    long currTime = millis();
    if (currTime - lastTime > 10000) {
      lastTime = currTime;
      humidity = random(100);
      temperature = random(50);
      Serial.println("-----------------------");
      // http.begin("http://api.ipify.org/");  // Specify destination for HTTP request
      // https://blynk.cloud/external/api/update?token={token}&pin={pin}&value={value}
      sprintf(url , "https://blynk.cloud/external/api/update?token=%s&V5=%.2f",BLYNK_AUTH_TOKEN ,humidity);
      Serial.println("message = " + (String)url);
      SendMessage(url);
      delay(1000);
	}

    // https://{server_address}/external/api/get?token={token}&{pin}
    // https://blynk.cloud/external/api/get?token=XoNXUD1WSva6Jmuj9HPyeBr5Sx8ogbWj&v0
    sprintf(url , "https://blynk.cloud/external/api/get?token=%s&V1",BLYNK_AUTH_TOKEN);
    Serial.println("message = " + (String)url);
    SendMessage(url);
    if (response == "0") {
      digitalWrite(LED2_PIN,HIGH);
      Serial.println("LED2 on V1: off");
    } else {
      digitalWrite(LED2_PIN,LOW);
      Serial.println("LED2 on V1: on");
    }
  // }
  delay(1000);  //Send a request every 1 seconds
}

void SendMessage(String url) {
  if(WiFi.status()== WL_CONNECTED){   //Check WiFi connection status
    HTTPClient http;  // 創建HTTPClient對象
    http.begin(url);  // Specify destination for HTTP request
    http.addHeader("Content-Type", "text/plain");  // Specify content-type header
    int httpCode = http.GET();
    //int httpCode = http.POST("");
    Serial.println("http Response Code=" + String(httpCode)); //Print HTTP return code //200 is OK

    if (httpCode == HTTP_CODE_OK) {       // 如果取得資料成功200
      response = http.getString(); // Get the response to the request
      Serial.println(response);           // Print request answer
    }else{
      Serial.println("Error on sending POST: " + (String)httpCode);
    }
    http.end();  // Free resources
  }else{
    Serial.println("Error in WiFi connection");
  }
}