Yes, I am using a USB serial dongle. It's a known reasonably good quality brand that otherwise works fine interactively.

On Mon, Aug 20, 2018 at 10:33 AM, Paul van den Bergen <paul.vandenbergen@gmail.com> wrote:

are you using a USB to Serial dongle? for some time now they've been a standardised SoC that apparently handles breaks poorly... so if the system is expecting a break...

(found this out for Unify PABX and Cisco serial - in the latter case, dropping the speed to 2400 and holding down space bar for 15 seconds was enough to fake a break - go figure... weird )

On Mon, 20 Aug 2018 at 10:29, cory seligman via luv-main <luv-main@luv.asn.au> wrote:

Hi All,

I'm having some trouble making expect work.

I need it to talk to some vintage equipment over usb serial, and I think I'm getting hung up on opening the port.

When the script runs, it just connects to the device and sits there. I can drive it interactively, but it doesn't attempt to automate anything.

Any ideas? Thanks.

My expect script looks like this:

#!/usr/bin/expect -f

# device
set modem /dev/ttyUSB0

# keep it open
exec sh -c "sleep 3 < $modem" &

# serial port parameters
exec stty -F $modem 2400 raw -clocal -echo -istrip -hup

# connect
send_user "connecting to $modem, exit with ~,\n"
spawn -open [open $modem w+]
interact {
    ~, exit
    ~~ {send "\034"}
}

set force_conservative 1 ;# set to 1 to force conservative mode even if
              ;# script wasn't run conservatively originally
if {$force_conservative} {
    set send_slow {1 .1}
    proc send {ignore arg} {
        sleep .1
        exp_send -s -- $arg
    }
}

set timeout -1
match_max 100000
send -- "\r"
send -- "\r"
expect  ">"
send -- "p 7d91\r"
expect  ">"
send -- "p b2ff\r"
expect  ">"
send -- "h\r"
expect  ">"
send -- "td\r"
expect "td\r
  18 215  12  24  33\r
>"
send -- "gd 215\r"
expect eof

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--

Dr Paul van den Bergen