MQTTnet/Source/MQTTnet/IApplicationMessageReceiver.cs

using System;
using System.Threading.Tasks;
using MQTTnet.Client.Receiving;

namespace MQTTnet
{
    public interface IApplicationMessageReceiver
    {
        /// <summary>
        /// Gets or sets the application message received handler that is fired every time a new message is received on the client's subscriptions.
        /// Hint: Initialize handlers before you connect the client to avoid issues.
        /// </summary>
        IMqttApplicationMessageReceivedHandler ApplicationMessageReceivedHandler { get; set; }

        /// <summary>
        /// Fired when an application message was received.
        /// </summary>
        event Func<MqttApplicationMessageReceivedEventArgs, Task> ApplicationMessageReceivedAsync;
    }
}