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sub get_keyword_names {
    my ($self) = @_;
    my $class = $self->lib;
...
    my $self = shift;
    $self->backend->start_server;
}

package RobotRemoteServer::Frontier;
sub _shut_down_request {
...
        return $self->SUPER::accept;
    }
}

use RobotRemoteServer;
#my $rob = RobotRemoteServer->new (qw' host localhost port 666  ');
...
  lib     ExampleLibrary
');
$rob->start_server;