Now the short parameter is the first letter of the long parameter
which is much more natural.

The short -h parameter will be used to set device host name.

The biggest Videohub seems to have 288 inputs/outputs.

It is not a good idea parse_cmd() to just die().

It is not guaranteed that each command will come in it's own buffer. In
fact when several changes are made at once the commands are not separated.

The routing was completely reversed and buggy. It should be done by
output instead it was done by input.