Arduino:
HTTP-pyynnön lähettäminen

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>

const char* ssid = "yourSSID";
const char* password = "yourPassword";

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  HTTPClient http;
  http.begin("http://yourserver.com/data"); // Your API endpoint
  int httpCode = http.GET();
  
  if (httpCode > 0) { 
    String payload = http.getString();
    Serial.println(httpCode);
    Serial.println(payload);
  } else {
    Serial.println("Error on HTTP request");
  }

  http.end(); 
}

void loop() {
  // Nothing to do here
}