import { S7DataType } from './enhanced-utils.js';
export interface PollPoint {
    address: string;
    dataType: S7DataType;
    stringLen?: number;
}
export interface ChangeRecord {
    address: string;
    dataType: S7DataType;
    oldValue: any;
    newValue: any;
}
export interface PollingOptions {
    ip: string;
    port: number;
    rack: number;
    slot: number;
    interval?: number;
    reconnectInterval?: number;
}
type ChangeHandler = (changes: ChangeRecord[]) => void;
type ErrorHandler = (error: any) => void;
type ConnectHandler = () => void;
export declare class S7PollingClient {
    private options;
    private _points;
    private _cache;
    private _connected;
    private _polling;
    private _running;
    private _timer;
    private _reconnectTimer;
    private _onChange;
    private _onError;
    private _onConnect;
    private _onDisconnect;
    private client;
    private enh;
    constructor(options: PollingOptions);
    updatePoints(points: PollPoint[]): void;
    addPoint(point: PollPoint): void;
    removePoint(address: string): void;
    onChange(handler: ChangeHandler): void;
    onError(handler: ErrorHandler): void;
    onConnect(handler: ConnectHandler): void;
    onDisconnect(handler: ConnectHandler): void;
    start(): void;
    stop(): void;
    private _connect;
    private _startPolling;
    private _poll;
    private _scheduleReconnect;
}
export {};
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