Usage:
 ldattach [options] <ldisc> <device>

Attach a line discipline to a serial line.

Options:
 -d, --debug             print verbose messages to stderr
 -s, --speed <value>     set serial line speed
 -c, --intro-command <string> intro sent before ldattach
 -p, --pause <seconds>   pause between intro and ldattach
 -7, --sevenbits         set character size to 7 bits
 -8, --eightbits         set character size to 8 bits
 -n, --noparity          set parity to none
 -e, --evenparity        set parity to even
 -o, --oddparity         set parity to odd
 -1, --onestopbit        set stop bits to one
 -2, --twostopbits       set stop bits to two
 -i, --iflag [-]<iflag>  set input mode flag

 -h, --help              display this help
 -V, --version           display version

Options relevant to GSM0710:
 -m, --mtu <value>  set CMUX maximum frame size

Known <ldisc> names:
  TTY           SLIP          MOUSE         PPP           STRIP
  AX25          X25           6PACK         R3964         IRDA
  HDLC          SYNC_PPP      SYNCPPP       HCI           GIGASET_M101
  M101          GIGASET       PPS           GSM0710

Known <iflag> names:
  IGNBRK        BRKINT        IGNPAR        PARMRK        INPCK
  ISTRIP        INLCR         IGNCR         ICRNL         IUCLC
  IXON          IXANY         IXOFF         IMAXBEL       IUTF8

For more details see ldattach(8).