Hi all,

Thanks for taking intereset in my issue.

I did one project with GSM modem interfacing with 8051 microcontroller. I successfully completed send and receive information through SMS. But the issue is the time lag. SMS is not that fast so I thought of switching form GSM to GPRS connectivity.

Now issue is i don't have good knowledge of TCP/IP and don't know how to send string to GPRS modem & how to receive and interprit the GPRS string..

Can anyone help me to come out of the issue...., please advise me for some good reading material for GPRS communication, TCP/IP etc (if at all required for this project )

Thanks you all in advance.

Have good day.

Divyang

can you please quote which modem you are using?

Thanks Ajay for your interest.

My modem is wavecom which supports GPRS also. I am not very sure of the model number as its assembled by a local vender in Mumbai, India. Document given with the modem shows that it supports GPRS too. My sms application working fine on it.

Again thanks for your time and efforts.

Divyang

then you must take a look at the technical document provided.
I will tell shyam to assist you in this matter. He has been working on GPRS modems. He is little busy with his work so couldnt come online.
Please wait till he come and help you out.

if u r using wavecom!!!
ask your supplier for openAt developer suit..
it is really very easy to send data via GPRS using wavecom and OpenAt.
which company do u work for???

Thanks Ajay & Shyam,

At present I am working for TCS.
My exact issue is that I don't want point to point connection because if more then one remot unit tries to contact to a master unit then they have to be in queue. Instead if they connect to a common interetnet site then I guess no queue required to log online data. "Many data packets can come from many sources at a time and no queue required" this is what I believe, why I want to switch to GPRS.

The question is "Whether my belief is true or not?", "Am I going on correct way for my requirement?"

TCS !! i guessed so!!!

ok which module are u using i mean q24plus/q2686 ????

if u are using the OPEN-AT development suit then u can use the WIP functionality ..

once u start reading that document you can procceed ahead!!

where is shailesh !!!!

he is the most appropriate guy to answer ur querries!!!

you can also consider visiting the Wavecom development forum managed by the wavecom people themselves!!

Thanks Shyam,

At present I don't know which module or model of wavecom will be used in the project. I am preparing project plan for the same. If you have any suggestion then please convey..

it all depends on your application ..

if you want to make it cost effective plus u need less control pins go for q24plus... (can be developed on a 2 sided PCB).. it has in built ARM7 proccessor.
else if u want more controll pins and a better proccessor ARM-9 go for q2686
remember u'll need a 4 -layered pcb plus a lot more money...

u people neednot abt money i guess

Thanks Shyam,

One more thing to ask... It's about bulk sms facility, If I want to send a same query to all remote unit, at present I am sending one by one sms to all intended mobile numbers ( and it takes hell lot of time!!! ). But I know that some modem has bulk sms facility, my understanding about bulk sms is sending same sms to multiple units more efficiently.. (i.e with lower microcontroller over head and taking less time to send them all...) is it true?... Is it advisable to use that facility??

Thanks.

hi Divyang..

yes most of us trying to make SMS server kinda devices are facing this problem.....

if u r going for bulk SMS in that case (q24Plus) modules will be in a state of wait!!!

but in OPenAT u might be running a lot of other timers!! so may be sometimes the bulk sms gets canceled...

better create different threads for different recepients and then rum them concurrently...

the above statement also keeps in consideration that u are firing AT commands rather than the OpenAT apis.
if using OpenAT Apis there will not be much of a problem cause u have a tiny OS (firmware) to back on!!

Hi Shyam,

This time I get confused.. not getting you properly.. Your one statement -"OPenAT u might be running a lot of other timers!! so may be sometimes the bulk sms gets canceled" - reveals that OPenAT is not reliable and the last statement of your post contradict it by saying - "if using OpenAT Apis there will not be much of a problem"… Hope you understand my problem…should I go for OPenAT or firing AT commands by separate application without using OPenAT..

go for OpenAT!!!

sorru for confusing you .. didnt mean it

But what about reliability??

reliability...

u have Infosys at ur phonecall what else u want???

Hi Friends,
i am extremely sorry I could not reply forum. Dear divyang Please paste the response of few command given here. so I will be able to help you out in resolving your problems
ATi3
AT+WOPEN?
AT+WOPEN=2
these are most imporatnt command for me to understand the issue.