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Full Discussion: How do I capture responses from the chat command?
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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LEARN ABOUT DEBIAN

tcpser

TCPSER(1)						      General Commands Manual							 TCPSER(1)

NAME

       tcpser - emulate a Hayes compatible modem

SYNOPSIS

       tcpser -d dev -s speed [-l log_level -t tracing_options] ...
       tcpser -v port [-l log_level -t tracing_options] ...

DESCRIPTION

       This manual page documents briefly the tcpser command.

       tcpser  turns  a  PC serial port into an emulated Hayes compatible modem that uses TCP/IP for incoming and outgoing connections.  It can be
       used to allow older applications and systems designed for modem use to operate on the Internet.	tcpser supports all  standard  Hayes  com-
       mands,  and  understands extended and vendor proprietary commands (though it does not implement many of them).  tcpser can be used for both
       inbound and outbound connections.

OPTIONS

       A summary of options is included below.

       -h     Show summary of options.

       -p     Port to listen on (defaults to 6400).

       -t     Trace flags: (can be combined)
		 s	modem input
		 S	modem output
		 i	IP input
		 I	IP output

       -l     Log level: 0 (NONE), 1 (FATAL) - 7 (DEBUG_X) (defaults to 0).

       -L     Log file (defaults to stderr).

       The following can be repeated for each modem desired (-s, -S, and -i will apply to any subsequent device if not set again):

       -d     Serial device (e.g. /dev/ttyS0).	Cannot be used with -v

       -v     TCP port for VICE RS232 (e.g. 25232). Cannot be used with -d

       -s     Serial port speed (defaults to 38400).

       -S     Speed modem will report (defaults to -s value).

       -I     Invert DCD pin.

       -n     Add phone entry (number=replacement).

       -a     Filename to send to local side upon answer.

       -A     Filename to send to remote side upon answer.

       -c     Filename to send to local side upon connect.

       -C     Filename to send to remote side upon connect.

       -N     Filename to send when no answer.

       -B     Filename to send when modem(s) busy.

       -T     Filename to send upon inactivity timeout.

       -i     Modem init string (defaults to `', leave off `at' prefix when specifying).

       -D     Direct connection (follow with hostname:port for caller, : for receiver).

AUTHOR

       tcpser was written by Jim Brain <brain@jbrain.com>.

       This manual page was written by Peter Collingbourne <pcc03@doc.ic.ac.uk>, for the Debian project (but may be used by others).

								   July  5, 2006							 TCPSER(1)
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