Re: SMS V's GPRS question
- From: RichardB <RichardB@xxxxxxxxxxxxxxxxx>
- Date: Mon, 3 Apr 2006 03:46:03 -0700
Matthias,
Thank you. That sounds like a nice simple solution.
I will give it a go.
--
Richard
"Matthias Moetje [MVP]" wrote:
Richard,.
OK, now I understand. With regards to programming
I'd say setting up a .NET web service would be the
easiest thing you could do. You'd have a consistent
programming environment and a simple interface
and you wouldn't need to care about the transport.
You just define a function on the server that you
call from the clients..
Only thing required would be a permanent IP address
in the head office (or at least some dynamic DNS).
The internet connection would be most flexible in this
case because the mobile device could
- be cradled (Internet through PC)
- use GPRS or UMTS
- use CSD to dial into an internet access point
where no UMTS or GPRS is available
- use WLAN
to connect.
Best regards,
Matthias Moetje
-------------------------------------
TERASENS GmbH
Augustenstraße 24
80333 Munich, GERMANY
-------------------------------------
Fon: +49 89 143370-0
Fax: +49 89 143370-22
e-mail: moetje at terasens dot com
www: www.terasens.com
-------------------------------------
"RichardB" <RichardB@xxxxxxxxxxxxxxxxx> wrote in message
news:44C950C6-54F1-4A8A-87C5-C568F3EADF77@xxxxxxxxxxxxxxxx
Matthias,even
Thank you for the reply.
I may have confused things with my original statement.
When I said an internet connection was not allowed, I was thinking of some
of the web sites that provide SMS messaging via a web site or web service.
Use of a third party web site is not allowed but using GPRS is allowed
if it goes via the internet, just as long as no third party web site islooking
involved.
I'm basically looking for a simply was of communicating via a GPRS GSM
modem. 15 mobile units into 1 Head Office system. The previous system used
SMS becuase a CSD system would not allow 15 units to access a single head
office system. SMS was the only store and forward system available to the
customer at the time.
Today we can use GPRS and I would very much like to use it but I was
for some pointers as to setting up a simple communications between themobile
units and head office.needs
Any pointers would be very welcome.
Thank you.
--
Richard
"Matthias Moetje [MVP]" wrote:
Richard,
if an internet connection is not allowed, then the only
other option is to create a direct data connection
with CSD (circuit switched data). You can't use
GPRS because you can't set up your own access
point and the access points that are offered by
providers usually connect to the internet.
Creating a data connection is very similar to a
modem connection except that the connection
is digital in the GSM network. When the call
transitions from GSM to PSTN there are two
options depending on the remote party's capabilities
- if it's analog, then the GSM provider converts
your data to analog
- it it's ISDN, then the GSM provider converts
to ISDN V.110 (most ISDN boards support that)
But this is only the data link layer. For the transport
layer you have two options:
- either you set up an IP connection over this data
connection (you would use RAS on both sides
for establishing the connection and winsock for
communication via UDP or TCP)
- or you create a TAPI application that runs on both
sides and uses the modems through TAPI. Through
lineGetID("comm/datamodem") you get a handle that
can be used with ReadFile/WriteFile (overlapped I/O
required), thus you could create your own protocol
(e.g. terminal-like)
Best regards,
Matthias Moetje
-------------------------------------
TERASENS GmbH
Augustenstraße 24
80333 Munich, GERMANY
-------------------------------------
Fon: +49 89 143370-0
Fax: +49 89 143370-22
e-mail: moetje at terasens dot com
www: www.terasens.com
-------------------------------------
"RichardB" <RichardB@xxxxxxxxxxxxxxxxx> wrote in message
news:25370B2D-B440-4677-B551-1F9FCE9A256E@xxxxxxxxxxxxxxxx
Hello,
I'm new to the TAPI scene so please excuse my ignorance.
I have a mobile project running on a tablet PC under XP Tablet that
wayto
perform a small amount of data exchange to a central Head Office PC.
My question is 'which is the best technology to use for this mobile 2
oncommunications'? SMS or some other form of more advanced data exchangeover
GPRS? I don't know much about other data exchange protocols running
GSMGPRS
so would appreciate any pointers.
All the systems (the mobile Tablet and the Head Office computer) have
waymodems attached. No connection to the internet is allowed.
The data being exchanged between the mobile tablets and head office (2
secondscommunications is required) is small, less than the 160 bytes so SMSmessages
will work and the current 7 year old system uses exactly this method.
However I'm thinking there must be better ways of performing 2 way
communications than over over SMS. It's slow and requires several
Headfor
each message to get through. On the other hand it is robust. If the
centreOffice computer is down the messages just queue up at the message
theand
are delivered when the Head Office GSM modem is turned on again.
I.m basically looking for a "simple" means of communicating between
formmobile tablets and head office. Windows Mobile supports SMS.Lib thatprovides
methods SmsSendMessage and SmsReadMessage. This looks great and is thekind
of "simple" level I'm thinking of (if SMS is the way to go). Or some
communications,of
method that will send XML or something from one GSM modem to another.
Store and forward (like SMS) would be good but not essential.
Any help would be appreciated as I'm very new to mobile
TAPI, etc.
Thank you
--
Richard
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