cmd_txt = "dbus-send --session "\
        "--type=method_call "\
        "--dest=litu.{v_dest} "\
        "/litu/{v_dest} "\
        "public.{v_iface} "\
        "string:litu.{v_src} "\
        "string:/litu/{v_src} "\
        "string:public.{v_iface} "\
        "string:{v_data}".format(v_dest=dest, v_iface=iface, v_src=src, v_data=data)