# Eingabe vom Browser
sub control{
    my $self = shift;
    if($self->param('update')){
        my $raw = $self->bufferdecode; # z.B. aldi, 7,99 
        $self->{USSD}->merge(@$raw);
        $self->{USSD}->write;
        $self->content('USSD updated');
    }
}