#include <WiFi.h>
const char* ssid = "your-ssid";
const char* password = "your-password";
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}
void loop() {}

#include <WiFi.h>
const char* ssid = "your-ssid";
const char* password = "your-password";
// 環境に合わせて書き換える(ルーターのDHCP範囲外のアドレスを指定)
IPAddress localIP(192, 168, 1, 50);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
void setup() {
  Serial.begin(115200);
  if (!WiFi.config(localIP, gateway, subnet)) {
    Serial.println("Static IP configuration failed.");
  }
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Fixed IP address: ");
  Serial.println(WiFi.localIP());
}
void loop() {}

// pip相当: ArduinoJsonをライブラリマネージャーから追加
#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
const char* ssid = "your-ssid";
const char* password = "your-password";
const char* API_URL = "https://example.com/api/weather"; // 利用するAPIのURLに置き換える
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) delay(500);
  HTTPClient http;
  http.begin(API_URL);
  int statusCode = http.GET();
  if (statusCode == 200) {
    String body = http.getString();
    JsonDocument doc;
    deserializeJson(doc, body);
    Serial.print("Response: ");
    serializeJsonPretty(doc, Serial);
  } else {
    Serial.print("GET failed. status: ");
    Serial.println(statusCode);
  }
  http.end();
}
void loop() {}

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
const char* ssid = "your-ssid";
const char* password = "your-password";
const char* API_URL = "https://example.com/api/sensor";
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) delay(500);
}
void loop() {
  HTTPClient http;
  http.begin(API_URL);
  http.addHeader("Content-Type", "application/json");
  JsonDocument doc;
  doc["value"] = random(0, 100);   // 実センサーの値に置き換える
  doc["device"] = "esp32-test";
  String payload;
  serializeJson(doc, payload);
  int statusCode = http.POST(payload);
  Serial.print("POST status: ");
  Serial.println(statusCode);
  http.end();
  delay(10000); // 10秒間隔
}

#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#define SERVICE_UUID        "6e400001-b5a3-f393-e0a9-e50e24dcca9e"
#define CHARACTERISTIC_UUID "6e400003-b5a3-f393-e0a9-e50e24dcca9e"
#define BUTTON_PIN 27
BLECharacteristic *buttonCharacteristic;
bool lastState = false;
void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  BLEDevice::init("ESP32-Button");
  BLEServer *server = BLEDevice::createServer();
  BLEService *service = server->createService(SERVICE_UUID);
  buttonCharacteristic = service->createCharacteristic(
    CHARACTERISTIC_UUID,
    BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_NOTIFY
  );
  buttonCharacteristic->setValue("released");
  service->start();
  server->getAdvertising()->start();
}
void loop() {
  bool pressed = digitalRead(BUTTON_PIN) == LOW; // 内蔵プルアップなのでLOWで押下
  if (pressed != lastState) {
    lastState = pressed;
    buttonCharacteristic->setValue(pressed ? "pressed" : "released");
    buttonCharacteristic->notify();
    Serial.println(pressed ? "pressed" : "released");
  }
  delay(30); // 簡易的なチャタリング対策
}

#define uS_TO_S_FACTOR 1000000ULL  // マイクロ秒→秒の変換係数
#define SLEEP_SECONDS 60           // 60秒ごとに起床
void setup() {
  Serial.begin(115200);
  delay(200);
  Serial.println("Woke up. Doing the job...");
  // ここで本来はセンサー読み取りやWi-Fi送信を行う
  Serial.println("Going to deep sleep now.");
  esp_sleep_enable_timer_wakeup(SLEEP_SECONDS * uS_TO_S_FACTOR);
  esp_deep_sleep_start();  // ここでCPUがほぼ完全に停止する
}
void loop() {
  // Deep Sleep中はloop()に到達しない
}