import mqtt, { MqttClient } from 'mqtt';
declare class MqttService {
    client: MqttClient | null;
    private isConnected;
    private subscribedTopics;
    connect(brokerUrl: string, options?: mqtt.IClientOptions): void;
    subscribe(topic: string): void;
    publish(topic: string, message: string): void;
    disconnect(): void;
}
export declare const mqttService: MqttService;
declare global {
    interface Window {
        mqttService: MqttService;
    }
}
export {};