PPP over serial for GC864-QUAD-V2 in embedded linux

9 thoughts on “PPP over serial for GC864-QUAD-V2 in embedded linux”

1. Hello,

    

   I’m working with GC864-QUAD-V2 for GSM interface and CC864-DUAL for CDMA interface. The telit module is connected to our embedded linux board through the serial port (UART). I want to use the telit module as the serial modem to have direct TCP/IP connection over the internet.

    I want to set up the Point-To-Point Protocol (PPP) with the ISP provider through the GSM/CDMA module. Please provide necessary directions/documents to configure the telit GSM/CDMA module for configuring the PPP over the serial port.

    

   Thanks,

    

   -Ganesh 

   1. The setup is not different than with any other GPRS/CDMA modem, with procedures described in various how-to’s; the only gotcha might be to take care of the flowcontrol, set it the same in PPP and module.

       

      1. Telit module is connected to my linux on "ttyUSB0"(usb-serial converter). I tried to use "wvdial" utility for connecting. It did not help. Even I tried to configure PPP daemon also. But no improvement. But I was able to send and receive commands and replys to GC864 through "minicom" of the linux.

          

         The Communication settings in GC864 are:

         +IPR = 0 (auto baud)

         +IFC = 0,0 (No flow control)

          

         My wvdial.conf settings are:

          

         [Dialer Defaults]
         Modem Type = Analog Modem
         Modem = /dev/ttyUSB0
         Flow control = no
         Carrier check = no
         Baud = 115200

         Init1 = ATZ
         Init3 = AT+CGDCONT=1,”IP”,”airtelgprs.com”,”",0,0
         Init3 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
         ISDN = 0
         New PPPD = yes
         Phone = *99***1#
         Username = ”“
         Password = ”“
         Stupid Mode = 1

         Thanks,

         -Ganesh

          

          

         1. Try to set AT&K0 as well. Any information where things get stuck?

            1. I added AT&K0 also in the configuration file.

               Now wvdial.conf looks like:

                

               [Dialer Defaults]
               Modem Type = Analog Modem
               Modem = /dev/ttyUSB0
               Flow control = no
               Carrier check = no
               Baud = 115200
               Init1 = ATZ
               Init2 = AT&K0
               Init4 = AT+CGDCONT=1,”IP”,”airtelgprs.com”
               Init3 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
               ISDN = 0
               New PPPD = yes
               Phone = *99***1#
               Username =
               Password =
               Stupid Mode = 1

                ————————————-

                

               Below is output the "wvdialconf" command:

                

               root@ubuntu:/# wvdialconf
               Editing `/etc/wvdial.conf’.

               Scanning your serial ports for a modem.

               ttyS0<*1>: ATQ0 V1 E1 — failed with 2400 baud, next try: 9600 baud
               ttyS0<*1>: ATQ0 V1 E1 — failed with 9600 baud, next try: 115200 baud
               ttyS0<*1>: ATQ0 V1 E1 — and failed too at 115200, giving up.
               ttyS1<*1>: ATQ0 V1 E1 — failed with 2400 baud, next try: 9600 baud
               ttyS1<*1>: ATQ0 V1 E1 — failed with 9600 baud, next try: 115200 baud
               ttyS1<*1>: ATQ0 V1 E1 — and failed too at 115200, giving up.
               Modem Port Scan<*1>: S2   S3  
               ttyUSB0<*1>: ATQ0 V1 E1 — failed with 2400 baud, next try: 9600 baud
               ttyUSB0<*1>: ATQ0 V1 E1 — failed with 9600 baud, next try: 115200 baud
               ttyUSB0<*1>: ATQ0 V1 E1 — and failed too at 115200, giving up.

               Sorry, no modem was detected!  Is it in use by another program?
               Did you configure it properly with setserial?

               Please read the FAQ at http://open.nit.ca/wiki/?WvDial

               If you still have problems, send mail to <wvdial-list@lists.nit.ca>.

               ————————————————-

                

               Below is the output of the "wvdial" command:

                

               root@ubuntu:/# wvdial
               –> WvDial: Internet dialer version 1.60
               –> Initializing modem.
               –> Sending: ATZ
               –> Sending: ATQ0
               –> Re-Sending: ATZ
               –> Modem not responding.

            2. I have no experience with wvdial, is strange minicom sees the modem while wvdial doesn’t. All setting are the same, and minicom closed?

            3.  

               ppp worked!!.  Thanks for your timely replys. Our setup did not have CTS/RTS connections, so I removed line crtscts from /etc/ppp/options.

               Now I am able to use pon and poff for turning on/off ppp daemon..

                

               Thanks!!

2. The setup is not different than with any other GPRS/CDMA modem, with procedures described in various how-to

    

    

   Cosmin,

    

   I’m new to the GPRS & HSDPA things but have
   had GSM, circuit switched data modems running in the system that I’m
   working on now. ( The delay through the GSM was just too long. )

    

   Anyway, I’ve been trying to find all these "how-tos" and had no joy.

   Could you point me to some please ?

    – I’m just looking for a replacement for a circuit switched data path.

    

   regards,

   mark.

    

   1. The Linux GPRS HOWTO doesn’t help you? If not, where do you get stuck?