Re: UDP over vodafone

On Jul 1, 9:42 am, Simon Hart <srhart...@xxxxxxxxx> wrote:
The only thing I will say about public APN's if you are not aware, is they
are OK for general internet browsing but not data transfer. Internet browsing
was what they were originally intended for. They are not good enough for a
line-of-business enterprise system. They are very unreliable.

This coupled with UDP, you are going to have a very unreliable system.
--
Simon Harthttp://simonrhart.blogspot.com



"CraigGRA" wrote:
On Jun 30, 2:40 pm, Simon Hart <srhart...@xxxxxxxxx> wrote:
Are you talking about a public APN not private leased line? if so then this
is probebly correct, however a private line there should be no limitations.
--
Simon Harthttp://simonrhart.blogspot.com

"CraigGRA" wrote:
On Jun 29, 3:19 pm, "Arsalan Ahmad" <arsalan_ah...@xxxxxxxxxxx> wrote:
What I have heard from someone that the operators also have a firewall that
only allows certain ports.

"Simon Hart" <srhart...@xxxxxxxxx> wrote in message

news:2A3CDEC1-B16B-4795-B414-1443BC5017D0@xxxxxxxxxxxxxxxx

This doesn't matter if you route back through the same outbound socket.
--
Simon Hart
http://simonrhart.blogspot.com

"Arsalan Ahmad" wrote:

Your mobile phone may be using NATed address.

"CraigGRA" <Craig...@xxxxxxxxx> wrote in message
news:1182882107.165752.87710@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Thanks Chris

I'll check with tech support at the carrier.

I would assume that TCP should not be blocked so I will make the
system switchable for UDP/TCP depending on which network it is on.

Craig

On Jun 26, 4:41 pm, "<ctacke/>" <ctacke[at]opennetcf[dot]com> wrote:
The carrier can (and often does) limit the types of data they will let
their
network carry. It's quite possible that the incoming UDP packets are
filtered early on.

--

Chris Tacke, Embedded MVP
OpenNETCF Consulting
Managed Code in an Embedded Worldwww.OpenNETCF.com

"CraigGRA" <Craig...@xxxxxxxxx> wrote in message

news:1182871816.172083.266090@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

When I run it on the LAN is is a very ocassional loss of data (once
every thousand or so sends), but run over gprs I never get any data
going from the sever to the device.
It almost always works going from the device to the server. (Same
loss
as on the LAN)

Craig

On 26 Jun, 14:36, Simon Hart <srhart...@xxxxxxxxx> wrote:
Are you saying you *always* lose data when you send back a message
or
every
now and then?
--
Simon Harthttp://simonrhart.blogspot.com

"CraigGRA" wrote:
Simon

The reason I wanted to use UDP is it is a lot lighter and I am
not
too
worried about loosing the odd message.

With it being a lighter weight protocol it should consume much
less
data over gprs

Craig

On 26 Jun, 11:15, Simon Hart <srhart...@xxxxxxxxx> wrote:
UDP is not very reliable. To do what you want which sounds like
a
connection-oriented application, you should be using TCP. The
only
downside
with TCP over UDP is the performance.
--
Simon Harthttp://simonrhart.blogspot.com

"CraigGRA" wrote:
Hi can anyone help

I have written a test app that sends information from a
Pocket
PC /
Smartphone running on the vodafone (UK) network to a server
via
UDP.
This seems to work ok, but when I try sending the information
back
again it never recieves it.

The first message to the server contains the current IP of
the
device
so I know the IP of the return message is to the correct IP.

I have a previous prototype working over the lan between 2
PCs
and
even between a LAN pc and one on the internet.

Is this vodafone blocking incomming traffic or do I need to
take
something else into consideration?

Thanks in advance

Craig

PS I want this to work via an O2 XDA at some point in the
near
future
as well, but am quite willing to make allowances for each
network
being different.- Hide quoted text -

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I have had some feedback from my 02 technical contact and he has given
me a document with a list of ports and protocols supported, nothing
back from vodafone yet- Hide quoted text -

- Show quoted text -

for the moment We are using a public apn, but are planning to put our
own private one in late this year.- Hide quoted text -

- Show quoted text -

We have a setting changes from the network providers that bypass their
proxy and that has seemed to help a great deal for some issues we have
had, but I will bear in mind your advice.

Thanks for the feedback

Craig

.

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