"""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."""
    from api import device_post

    try:
        result = device_post({
            "type": "deviceHeartbeat",
        }, timeout=timeout)
    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")