Option to read out current assigned IP address.

The host application can read the current IP address from the stack. If the stack is configured to
retrieve the IP address via DHCP or BOOTP, the host application can read the assigned IP address.
To read the current IP address the common socket API command
SOCK_CMD_GETIFADDRS_REQ/CNF can be used. This command is described in the Socket API
manual. Note: The command SOCK_CMD_GETIFADDRS_REQ/CNF must be sent to the channel 1
„Network Service Channel“ of the dual-port memory.