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03/05/2003 at 01:22PM PST, ID: 20539954
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7.5

Ougoing SMS collison problem (possible 3582 pts!)

Asked by JooZ in Wireless Technologies

Tags: sms

Hi all

have developed an SMS gateway using VB, mscomm and Wavecom GSM modems, that receives requests for data via SMS and sends a reply to requestor via SMS.

however, now that my user loads have increased, i am experiencing high traffic at peak hours. this causes outgoing sms to collide with a half-incoming SMS. (fully received SMSes on the sim are cleared before attempting to send outgoing)

how do i detect if the signal is busy and it is safe to send an SMS out, and if a collision should occur, how do i trap it, and at what event/time period should i wait before attempting to resend (is there a command that says "resend last sms"?)

to reproduce problem, try firing up to 10 sms from a mobile to a gsm modem that is set to send a reply. most sms applications developed locally have not encountered the problem due to insufficient traffic congestion.

i am now a slave to the server, as i have to monitor the gateway everyday (on public holidays too!) and restart the application after it hangs. please help.

500 points to anyone who has a solution. if you can solve my problems once and for all with source code example. then i'm willing to give 3582 pts (all i've got)View the Solution FREE for 7 Days
[+][-]03/06/03 07:16 AM, ID: 8080607

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[+][-]05/07/03 03:02 PM, ID: 8483431

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About this solution

Zone: Wireless Technologies
Tags: sms
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Solution Provided By: ShadowLight
Participating Experts: 5
Solution Grade: A
 
 
[+][-]05/07/03 03:53 PM, ID: 8483742

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