Some socket option should be set to the accepted Socket, not the listening Socket.

[xljiulang]

When I adapted MqttServerTcpEndpointBaseOptions in MQTTnet.AspnetCore to the socket accepted by kestrel, I unexpectedly found that the MqttTcpServerListener of MQTTnet.Server was adapted to the socket used for listening in its implementation.
I confirmed that the NoDelay, LingerState and KeepAlive* options are all used to set the socket accepted.

[xljiulang]

After analyzing the packets captured by Wireshark, I found that the settings of the socket to be listened to also automatically affect the sockets it accepts. So there is no problem here, it is just a blind spot in my personal knowledge.