Arduino:
Inviare una richiesta http

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

const char* ssid = "il_tuo_ssid";
const char* password = "la_tua_password";

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

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connesso alla rete WiFi...");
  }

  HTTPClient http;
  http.begin("http://api.example.com/data");
  int httpCode = http.GET();

  if (httpCode > 0) {
    String payload = http.getString();
    Serial.println(httpCode);
    Serial.println(payload);
  } else {
    Serial.println("Errore nella richiesta");
  }
  http.end();
}

void loop() {
}