import { IWebResponseCompatible } from "../types/requests";
import { IHeartbeat } from "../types/db";
export declare function server_get_last_heartbeat_by_device(device_id: number): Promise<IWebResponseCompatible<IHeartbeat | null>>;
export declare function server_get_heartbeats_by_device(device_id: number, limit?: number): Promise<IWebResponseCompatible<IHeartbeat[]>>;
export declare function server_check_device_online_status(device_id: number, offline_threshold_minutes?: number): Promise<IWebResponseCompatible<{
    is_online: boolean;
    last_heartbeat: IHeartbeat | null;
    minutes_since_last_heartbeat: number | null;
}>>;