On 2005-04-23, vikrant.shahir@gmail.com wrote:
: The dialing script worked and now file can be transfered from PC-A to
: PC-B over GSM network, via GSM modem.
:
: NOW:
: Now i am looking out at the answering computer(PC-B) to work in 2 ways.
:
: 1] To be in answering mode throughout:
: This task is done by setting "ats0=1".
:
: 2] To dial out at a regular interval(SCHEDULING....?)
: How to achieve this ?
:
: The idea is , the answering computer(PC-B) will remain constantly in answer
: mode to recieve any incomming calls plus dial out to server after every 30
: minutes to upload the file. So how will the PC-B be scheduled to dial out
: after every 30 mins. ?
:
Something like this:

set modem type xxx
set line /dev/ttyS0
if fail exit 1
; (configure modem to disable caller ID feature)

.interval ::= 30*60 ; Number of seconds in half an hour

while true {
.t1 := \v(ntime) ; Current time in seconds since midnight
answer \m(interval) ; Wait \v(interval) secs for call
if success {
(handle incoming call)
}
.t2 := \v(ntime) ; New time
if not > \m(t2) \m(t1) increment t2 86400
.interval ::= \m(interval) - (\m(t2) - \m(t1))
if <= \m(interval) 0 {
(it is time to make a call - use DIAL command)
.interval ::= 30*60
}
}

The proof is left as an exercise to the reader :-)

- Frank