Uno R4 · HTTP and internet consent

// SPDX-License-Identifier: MIT
// UNO R4 WiFi: one HTTP request using the public WiFiS3 client.
// Sandbox is the default. In the board's Wi-Fi inspector, signed-in Pro
// users can select Real internet, give consent, then restart this sketch.
// The secure gateway supplies HTTPS to the approved destination. This
// sketch uses WiFiClient, not WiFiSSLClient or native board TLS.
#include <WiFiS3.h>

const char HOST[] = "api.open-meteo.com";
const char PATH[] = "/v1/forecast?latitude=51.5&longitude=-0.12&current_weather=true";
WiFiClient client;

void setup() {
  Serial.begin(115200);
  Serial.println("UNO R4 HTTP: sandbox by default");
  Serial.println("Real internet: select the board, enable it in Wi-Fi, consent, then restart.");
  if (WiFi.begin("BreadboardNet") != WL_CONNECTED) {
    Serial.println("Wi-Fi join failed");
    return;
  }
  if (!client.connect(HOST, 80)) {
    Serial.println("HTTP connection failed");
    client.stop();
    return;
  }
  client.print("GET ");
  client.print(PATH);
  client.print(" HTTP/1.1\r\nHost: ");
  client.print(HOST);
  client.print("\r\nConnection: close\r\n\r\n");
  const unsigned long started = millis();
  unsigned int printed = 0;
  while (millis() - started < 15000 && (client.connected() || client.available())) {
    while (client.available() && millis() - started < 15000) {
      const int value = client.read();
      if (value >= 0 && printed < 4096) {
        Serial.write(static_cast<uint8_t>(value));
        printed++;
      }
    }
    delay(1);
  }
  const bool timedOut = millis() - started >= 15000;
  client.stop();
  Serial.println();
  Serial.println(timedOut ? "HTTP response timed out" : "HTTP request finished");
  if (printed == 4096) Serial.println("Serial output limited to 4096 bytes");
}

void loop() {}