MQTTnet/MQTTnet.Core/Channel/IMqttCommunicationChannel.cs

using System.Threading.Tasks;
using MQTTnet.Core.Client;
using System.IO;

namespace MQTTnet.Core.Channel
{
    public interface IMqttCommunicationChannel
    {
        Task ConnectAsync(MqttClientOptions options);

        Task DisconnectAsync();
        
        Stream Stream { get; }
    }
}