Re: [lwip-users] Problems Connecting to a GSM Router

[Ivan Delamer]

My experience is that some GSM modems are a bit unreliable, my suggestions
are:

- Make sure you are handling callbacks from PPP that may inform of a
disconnect. You can then close and re-establish your PPP session

- Some GSM modems may need a software reset or even hardware reset when
connection is dropped.

Cheers
Ivan


> Date: Mon, 12 Nov 2012 13:38:53 +0100
> From: Walter S?gessser <address@hidden>
> To: address@hidden
> Subject: [lwip-users] Problems Connecting to a GSM Router
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="iso-8859-15"; Format="flowed"
>
> We have developed a gateway that sends data gathered from some devices
> to a server. Via LAN -> WAN this works fine and reliably for months
> without failure. Now a customer has connected a GSM rounter instead. In
> principle this works, too. But after a not predictable time (minutes,
> hours, ... ) the GSM-router locks. When trying to establish a
> TCP-connection via "netconn_connect" I get -10 (connection aborted).
> I don't see how I could change the behavior for the connect command --
> either it works or it does not. Actually I think the problem is with the
> GSM-router, but may be, just may be anyone knows a trick or a special
> consideration to get rid of this connection problem.
>
> The connection gets closed after each transmission and the repetition
> rate is about 5 minutes. Thus the amount of data cannot be the problem.
>
> Thanks for any hint!
> Walter
>
> No Title
>
> _______________________________________________
> *Walter S?gesser
> *Dipl.-Ing. (FH)
> Software Development
> _______________________________________________
> *asp ag advanced solar products
> *Burgerfeldstrasse 19, CH-8730 Uznach SG, Switzerland
> TEL: +41 (0)55 61 66 107
> FAX:+41 (0)55 61 66 111
> address@hidden <mailto:address@hidden>
> www.asp-ag.com <http://www.deltaenergysystems.com/>
> ________________________________________________
>