"""Report the ReinLoop application's Server reachability for Panel status."""


def heartbeat_device(timeout=5):
    """Refresh the current device's Server heartbeat and return its timestamp."""
    import requests
    from api import data_record_url, the_folder

    try:
        response = requests.post(data_record_url, json={
            "type": "deviceHeartbeat",
            "deviceId": the_folder,
        }, timeout=timeout)
        response.raise_for_status()
        result = response.json()
    except Exception as exc:
        raise ValueError(f"设备心跳请求失败: {exc}") from exc
    if not result.get("success"):
        raise ValueError(result.get("errMsg", "设备心跳被服务端拒绝"))
    return result.get("lastSeenAt")