Is your feature request related to a problem? Please describe.
Perhaps I'm missing something, but when there are connection attempts after the TCPServer::stop(), the connections continue to be accepted, without a way to prevent those connections to be established and run its course.

Describe the solution you'd like

• Close the socket on stop, set _stopped to true, and ignore the exceptions in run() after that.
• add stop() to TCPServerConnectionFactory and allow it to return nullptr, in which case any accepted socket after TCPServer stop will die on their own