IoT家電とAWSで部屋の温度を自動調節してみた

const APPLIANCE_ID = process.env.APPLIANCE_ID;
const NATURE_TOKEN = process.env.NATURE_TOKEN;

async function getJson(url) {
  const r = await fetch(url, { headers: { Authorization: `Bearer ${NATURE_TOKEN}` }});
  if (!r.ok) throw new Error(`${url} ${r.status} ${await r.text()}`);
  return r.json();
}

async function postSettings(payload) {
  const url = `https://api.nature.global/1/appliances/${APPLIANCE_ID}/aircon_settings`;
  const r = await fetch(url, {
    method: "POST",
    headers: { 
      Authorization: `Bearer ${NATURE_TOKEN}`, 
      "Content-Type": "application/x-www-form-urlencoded" 
    },
    body: new URLSearchParams(payload),
  });
  const text = await r.text();
  if (!r.ok) throw new Error(`aircon_settings ${r.status} ${text}`);
  return text;
}

// 制御判定
function decide(temp, humi) {
  if (temp >= 28.0) {
    const t = 27;
    return { operation_mode: "cool", temperature: String(t), air_volume: "auto" };
  }
  if (Number.isFinite(humi) && temp >= 25.0 && temp < 28.0 && humi >= 70) {
    const t = 27;
    return { operation_mode: "dry", temperature: String(t), air_volume: "auto" };
  }
  return { button: "power-off" };
}

export const handler = async () => {
  const devs = await getJson("https://api.nature.global/1/devices");
  const temp = parseFloat(devs[0].newest_events.te.val);
  const humi = devs[0].newest_events.hu ? parseFloat(devs[0].newest_events.hu.val) : NaN;

  const target = decide(temp, humi);

  const res = await postSettings(target);

  return { status: "done", temp, humi, sent: target, response: res };
};