- tcp_open_socket(+SocketId, -StreamPair) is det
- Create streams to communicate to SocketId. If SocketId is a
master socket (see tcp_bind/2), StreamPair should be used for
tcp_accept/3. If SocketId is a connected (see tcp_connect/2) or
accepted socket (see tcp_accept/3), StreamPair is unified to a
stream pair (see stream_pair/3) that can be used for reading and
writing. The stream or pair must be closed with close/1, which
also closes SocketId.