MQTTnet/Frameworks/MQTTnet.NetStandard/Server/IMqttServer.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace MQTTnet.Server
{
    public interface IMqttServer : IApplicationMessageReceiver, IApplicationMessagePublisher
    {
        event EventHandler<MqttClientConnectedEventArgs> ClientConnected;
        event EventHandler<MqttClientDisconnectedEventArgs> ClientDisconnected;
        event EventHandler<MqttServerStartedEventArgs> Started;

        Task<IList<ConnectedMqttClient>> GetConnectedClientsAsync();

        Task SubscribeAsync(string clientId, IList<TopicFilter> topicFilters);
        Task UnsubscribeAsync(string clientId, IList<string> topicFilters);

        Task StartAsync(IMqttServerOptions options);
        Task StopAsync();
    }
}