/// <reference types="node" />
export declare type QoS = 0 | 1 | 2;
export declare type UserProperties = {
    [index: string]: string | string[];
};
export interface MQTTConnectOpts {
    url: string;
    username?: string;
    password?: string;
    topicRoot?: string;
    reconnectPeriod?: number;
    will?: {
        /**
         * the topic to publish
         */
        topic: string;
        /**
         * the message to publish
         */
        payload: Buffer | string;
        /**
         * the QoS
         */
        qos: QoS;
        /**
         * the retain flag
         */
        retain: boolean;
        properties?: {
            willDelayInterval?: number;
            payloadFormatIndicator?: boolean;
            messageExpiryInterval?: number;
            contentType?: string;
            responseTopic?: string;
            correlationData?: Buffer;
            userProperties?: UserProperties;
        };
    };
}