...

For UDP sockets, the sockets close() without delay. Thus, the next bind() is not blocked.

TCP Keep-Alives (TODO)

µC/TCP-IP does not currently support TCP Keep-Alives. If both ends of the connection are running different Network Protocol Stacks, you may attempt to enable TCP Keep-Alives on the remote side. Alternatively, the application will have to send something through the socket to the remote peer in order to ensure that the TCP connection remains open.