MqttClientOptionsBuilder.WithTcpServer System.ArgumentException: No endpoint is set

[ramonsmits]

Describe the bug

The MqttClientOptionsBuilder using WithTcpServer fails with the message "No endpoint is set" while RemoteEndpoint is assigned.

System.ArgumentException: No endpoint is set.
  at MQTTnet.Client.MqttClientOptionsBuilder.Build()

var options = new MqttClientOptionsBuilder()
    .WithTcpServer(s =>
    {
        s.AddressFamily = System.Net.Sockets.AddressFamily.InterNetwork;
        s.RemoteEndpoint = new DnsEndPoint(Server.Host, Server.Port);
    })
	.Build();

Doing the following works:

var options = new MqttClientOptionsBuilder()
    .WithEndPoint(new DnsEndPoint(Server.Host, Server.Port,System.Net.Sockets.AddressFamily.InterNetwork))
	.Build();

I'm not sure on the differences between these API's but I think WithTcpServer should be able to be used without WithEndPoint.

Maybe WithTcpServer is obsolete?

Which component is your bug related to?

• Client

To Reproduce

Steps to reproduce the behavior:

1. Using this version of MQTTnet 4.3.6.1152
2. Run this code, see above
3. With these arguments, see above
4. See error, see above

Expected behavior

Builder to succeed.