Do not subscribe to Pub/Sub in case we actually do not explicitly have configured so. Printouts for better traceability.

The custom opcua server bind option is added and it can be
parced with command line option -a or server_ip_address=.
If no ip address is mentioned, then server is listening on all interfaces

modified:   cli.h
modified:   keep_alive_publisher.h
modified:   keep_alive_subscriber.h
modified:   server.c

Test: Program is tested

Add a new CLI option to set the timeout after which without a heart beat a dependant coupler is considered DOWN.