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Operating Systems Linux How do I capture responses from the chat command? Post 302494568 by Corona688 on Monday 7th of February 2011 04:36:41 PM
Old 02-07-2011
Quote:
Originally Posted by Bashingaway
I want to query the modem for it's manufacturer, product id and firmware version using AT commands.
What function does 'chat' serve in this? You should just be able to talk to the modem.

Code:
#!/bin/sh
# set up modem device to translate outgoing \n into \r\n
stty -F /dev/ttyS0 9600 -echo igncr icanon onlcr
# Open modem for reading and writing
exec 5</dev/ttyS0
exec 6>/dev/ttyS0

echo "AT+CGMI" >&6

# Eat the echo, then eat the blank line
read <&5 ; read <&5
# Read the actual response
read RESPONSE <&5

echo "Response was $RESPONSE"

# close the files
exec 5<&-
exec 6>&-

Code:
$ ./modem.sh
Response was ERROR
$

...mine returns 'ERROR' because it's not a cellphone so AT+CGMI means nothing to it. It responds 'OK' to plain 'AT'. Works in BASH, KSH, and ASH. If you have trouble, try 'cat <&5' to see what it's printing.

Last edited by Corona688; 02-07-2011 at 05:42 PM..
 

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WEDGED(8)						      System Manager's Manual							 WEDGED(8)

NAME
wedged - HylaFAX modem wedged script SYNOPSIS
/var/spool/hylafax/bin/wedged devid device DESCRIPTION
bin/wedged is the command script invoked by the facsimile server when a modem is deemed to be in an irreparable state and requires operator intervention. This decision is based on the setting of the MaxSetupAttempts configuration parameter described in hylafax-config(5). The default wedged script sends electronic mail to the FaxMaster alias. The interval at which emails are sent can be configured in the etc/FaxDispatch file by setting the WEDGED_EMAIL_INTERVAL variable to the desired number of minutes (emails will be sent no more than every WEDGED_EMAIL_INTERVAL minutes, until the wedged condition persists). If the variable WEDGED_DISABLE_FAXGETTY is set in etc/FaxDispatch then the script will attempt to disable any faxgetty processes spawned by the init(8) process for the problematic modem. In addition the faxq(8) process automatically disables use of the modem for servicing outbound jobs. The devid argument is the identifier derived from the name of the modem's device file by substituting ``_'' characters for ``/'' charac- ters; e.g. term_10 for /dev/term/10. The device argument is the name of the character special device associated with the modem. If there exists an executable file /var/spool/hylafax/etc/resetmodem then that file will be executed upon execution of the wedged script in an effort to recover the modem. FILES
/usr/lib/sendmail for delivering mail SEE ALSO
faxq(8), hylafax-config(5) October 3, 1995 WEDGED(8)
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