billdbbilldb is responsible for accepted fares and passing them back to the
central server for storage into a remote database.
The main responsibilities include:
The standard use case will be for a system wide tunnel to be established
to a central server and for this program to connect "locally" through
a special port to communicate.
The address and port are currently set to 127.0.0.1 and 2455 respectively
but see busunit/common/common_config.h for details.