pppd

/etc/ppp/option 에서 crsrts제거해야 통신됨.

ctsrts

아래항목 처리.

AT*RNDISDATA=0

AT*AUTOCONN=0

#sudo pppd /dev/ttyUSB0 115200 unit 1 linkname datakey usepeerdns noauth user guest password guest defaultroute noipdefault ipcp-accept-local ipcp-accept-remote ipcp-max-failure 30 lcp-echo-interval 5 lcp-echo-failure 30 modem dump debug kdebug 8 connect "/usr/sbin/chat -v -t 500 -T *98# -f /home/happycpu/at_com_zte"

TIMEOUT   5

ECHO      ON

ABORT     BUSY

ABORT     ERROR

ABORT     'NO CARRIER'

ABORT     VOICE

ABORT     'NO DIALTONE'

ABORT     'NO DIAL TONE'

ABORT     'NO ANSWER'

ABORT     DELAYED

'' AT

OK AT

OK AT

SAY "Connect...\n"

OK        ATD*98#

TIMEOUT   30

SAY "done..\n"

CONNECT   ''

SAY "end\n"

그런데, ubuntu에서는 확인했으나, 라즈베리파이에서는 ftdi시리얼이 말을 듣지않음.