Re: Modem connection help : Multi-Tech MTCBA-G-EN-F4

I have not been able to make any headway on this.  If anyone has any ideas,
that would help, I would greatly appreciate it.

Thanks,

-Tony

On Sat, Jun 7, 2008 at 1:27 PM, Tony Kirkham <[email protected]> wrote:

> Hi, guys,
>
> I'm back with more questions.  I am still trying to get kannel to talk to a
> Multi-Tech MTCBA-G-EN-F4 modem that connects via an ethernet port.
>
> If you have good knowledge of the smsc_at driver code I could really use
> your help.
>
> I have been hacking away at the smsc_at.c code and have wrapped the code to
> detect the modem speed in an
>   if ( privdata->is_serial ) { ... }
> statement so that this won't be attempted because, apparently, you cannot
> detect this modems speed.
>
> I thought this would solve my problem but, alas, it did not.  I have now
> worked my way down into the at2_read_buffer() call and I think that this is
> where the problem is occurring.  I have placed a few DEBUG log file writes
> in locations to show what is happening.  I am completely new to
> communicating to modems and via raw tcp so I do not know what should be
> expected.  However, I don't think the at2_read_buffer() call is getting
> anything.  Below, is a reduced log file for the at device containing what is
> written from a startup - shutdown cycle of bearerbox.
>
> The biggest indicators that I see are that privdata->lib = strange
> characters and at2_read_line() never finds an end-of-line character.  The
> at2_read_buffer() call only executes a read the first time for the first AT
> command.  After that it seems like the state of something is stuck because
> the select() call only returns 0 causing the at2_read_buffer() call to
> return NULL before the read() is attempted.
>
> If anyone has some insight into this I would greatly appreciate it.  I am
> using the code in the source download.  I have not pulled anything from the
> cvs repository.
>
> Thank you very much,
>
> -Tony
>
> log file
>
>       1 2008-06-07 12:51:06 [15527] [6] INFO: AT2[vzn00]: opening device
>       2 2008-06-07 12:51:06 [15527] [6] DEBUG: AT2[vzn00]: device opened
>       3 2008-06-07 12:51:06 [15527] [6] INFO: AT2[vzn00]: init device
>       4 2008-06-07 12:51:06 [15527] [6] DEBUG: AT2[vzn00]: --> ATZ^M
>       5 2008-06-07 12:51:06 [15527] [6] DEBUG: AT2[vzn00]: --> ATZ^M
> -response: 4
>       6 2008-06-07 12:51:06 [15527] [6] DEBUG: in at2_wait_modem_command:
> before while cur_time <= end_time
>       7 2008-06-07 12:51:06 [15527] [6] DEBUG: in at2_read_buffer: after
> select, ret: 1
>       8 2008-06-07 12:51:06 [15527] [6] DEBUG: in at2_read_buffer: before
> read, ret: 1
>       9 2008-06-07 12:51:06 [15527] [6] DEBUG: in at2_read_buffer: after
> read, s: 12
>      10 2008-06-07 12:51:06 [15527] [6] DEBUG: in at2_read_line with
> gt_flag=0, gtloc=-1, lib=ÿý^Xÿý ÿý#ÿý'
>      11 2008-06-07 12:51:06 [15527] [6] DEBUG: in at2_read_line if eol ==
> -1 will return NULL eol: -1
>      12 2008-06-07 12:51:06 [15527] [6] DEBUG: in at2_read_buffer: after
> select, ret: 0
>      13 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_read_line with
> gt_flag=0, gtloc=-1, lib=ÿý^Xÿý ÿý#ÿý'
>      14 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_read_line if eol ==
> -1 will return NULL eol: -1
> ... 1000's of repetitions of the above 3 lines ...
>      15 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_wait_modem_command:
> Out of loop: cur_time: 1212864670, end_time: 1212864669
>      16 2008-06-07 12:51:10 [15527] [6] ERROR: AT2[vzn00]: Wrong or no
> answer to ATZ, ignoring
>      17 2008-06-07 12:51:10 [15527] [6] DEBUG: AT2[vzn00]: --> AT^M
>      18 2008-06-07 12:51:10 [15527] [6] DEBUG: AT2[vzn00]: --> AT^M
> -response: 3
>      19 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_wait_modem_command:
> before while cur_time <= end_time
>      20 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_read_buffer: after
> select, ret: 0
>      21 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_read_line with
> gt_flag=0, gtloc=-1, lib=ÿý^Xÿý ÿý#ÿý'
>      22 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_read_line if eol ==
> -1 will return NULL eol: -1
> ... 1000's of repetitions ...
>      23 2008-06-07 12:51:10 [15527] [6] DEBUG: in at2_read_buffer: after
> select, ret: 0
>      24 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_read_line with
> gt_flag=0, gtloc=-1, lib=ÿý^Xÿý ÿý#ÿý'
>      25 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_read_line if eol ==
> -1 will return NULL eol: -1
>      26 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_wait_modem_command:
> Out of loop: cur_time: 1212864674, end_time: 1212864673
>      27 2008-06-07 12:51:14 [15527] [6] ERROR: AT2[vzn00]: Wrong or no
> answer to AT. Trying again
>      28 2008-06-07 12:51:14 [15527] [6] DEBUG: AT2[vzn00]: --> AT^M
>      29 2008-06-07 12:51:14 [15527] [6] DEBUG: AT2[vzn00]: --> AT^M
> -response: 3
>      30 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_wait_modem_command:
> before while cur_time <= end_time
>      31 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_read_buffer: after
> select, ret: 0
>      32 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_read_line with
> gt_flag=0, gtloc=-1, lib=ÿý^Xÿý ÿý#ÿý'
>      33 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_read_line if eol ==
> -1 will return NULL eol: -1
> ... 1000's of repetitions ...
>      34 2008-06-07 12:51:14 [15527] [6] DEBUG: in at2_read_buffer: after
> select, ret: 0
>      35 2008-06-07 12:51:18 [15527] [6] DEBUG: in at2_read_line with
> gt_flag=0, gtloc=-1, lib=ÿý^Xÿý ÿý#ÿý'
>      36 2008-06-07 12:51:18 [15527] [6] DEBUG: in at2_read_line if eol ==
> -1 will return NULL eol: -1
>      37 2008-06-07 12:51:18 [15527] [6] DEBUG: in at2_wait_modem_command:
> Out of loop: cur_time: 1212864678, end_time: 1212864677
>      38 2008-06-07 12:51:18 [15527] [6] ERROR: AT2[vzn00]: Second attempt
> to send AT failed
>      39 2008-06-07 12:51:18 [15527] [6] ERROR: AT2[vzn00]: Opening failed.
> Terminating
>      40 2008-06-07 12:51:18 [15527] [6] INFO: AT2[vzn00]: closing device
>      41 2008-06-07 12:51:18 [15527] [6] INFO: AT2[vzn00]: closing device
>      42 2008-06-07 12:51:18 [15527] [6] DEBUG: Thread 6
> (gw/smsc/smsc_at.c:at2_device_thread) terminates.
>
>
>