MQTTnet/Source/MQTTnet.AspnetCore/MqttClientConnectionContextFactory.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using MQTTnet.Adapter;
using MQTTnet.Diagnostics.Logger;
using MQTTnet.Formatter;

namespace MQTTnet.AspNetCore;

public sealed class MqttClientConnectionContextFactory : IMqttClientAdapterFactory
{
    public IMqttChannelAdapter CreateClientAdapter(MqttClientOptions options, MqttPacketInspector packetInspector, IMqttNetLogger logger)
    {
        ArgumentNullException.ThrowIfNull(options);

        switch (options.ChannelOptions)
        {
            case MqttClientTcpOptions tcpOptions:
            {
                var tcpConnection = new SocketConnection(tcpOptions.RemoteEndpoint);

                var formatter = new MqttPacketFormatterAdapter(options.ProtocolVersion, new MqttBufferWriter(4096, 65535));
                return new MqttConnectionContext(formatter, tcpConnection);
            }
            default:
            {
                throw new NotSupportedException();
            }
        }
    }
}