sender.cpp

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

#define DHTPIN 15
#define DHTTYPE DHT22

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* serverName = "http://<Receiver_IP_Address>/update";

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  float temperature = dht.readTemperature();
  
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  if (temperature > 25.0) {
    if (WiFi.status() == WL_CONNECTED) {
      HTTPClient http;
      http.begin(serverName);
      http.addHeader("Content-Type", "application/x-www-form-urlencoded");
      int httpResponseCode = http.POST("temperature=1");
      
      if (httpResponseCode > 0) {
        String response = http.getString();
        Serial.println(httpResponseCode);
        Serial.println(response);
      } else {
        Serial.print("Error on sending POST: ");
        Serial.println(httpResponseCode);
      }
      http.end();
    }
  }
  
  delay(2000);
}