start()
{
    /opt/lsts/dune/bin/dune-gsmux \
        /dev/ttyO1 \
        /opt/lsts/dune/log \
        < /dev/null \
        >> /opt/lsts/dune/log/gsmux.log 2>&1 &
}

stop()
{
    killall dune-gsmux
}