/// <reference types="node" />
import { EventEmitter } from 'events';
import * as mqtt from 'mqtt';
export interface IMQTTConfig {
    site: string;
    gatewayId: string;
    isLocal: boolean;
    accessToken: string;
    keepAlive: number;
    reconnectPeriod: number;
    slowReconnectPeriod: number;
}
export declare class IThingsboardMQTTGateway extends EventEmitter {
    private config;
    private mqttClient;
    private slowReconnectCounter;
    private reconnectTimeout;
    constructor(config: IMQTTConfig);
    /**
     * Get the state of the MQTT connection
     * @returns true if connected to the Thingsboard instance, else false
     */
    isConnected(): boolean;
    /**
     * Connect to the Thingsboard instance
     * @returns A Promise which resolves if a connection is established, or rejects with the error if a connection fails
     */
    connect(): Promise<unknown>;
    /**
     * Disconnect from the Thingsboard instance
     * @param {boolean} [force = false] - Set true to force an immediate disconnects or false to wait for all
     * pending messages to complete before disconnecting
     * @returns A Promise which resolves when the connection has ended
     */
    disconnect(force?: boolean): Promise<unknown>;
    /**
     * Publish a device event to the Thingsboard instance
     * @param {string} payload - The event payload
     * @param {mqtt.QoS} qos - The QoS to use when publishing
     */
    publish(topic: string, payload: string, qos: mqtt.QoS): Promise<any>;
    /**
     * Force a reconnect if the connection is down for too long
     */
    private _reconnect;
}