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

From: Nikolas Karakotas
Subject: Re: [lwip-users] Problems Connecting to a GSM Router
Date: Mon, 12 Nov 2012 15:32:16 +0200

I use a GSM/GPRS module directly using PPP so you are right its not the tcp/ip stack. GSM modules might loose/drop a connection if the signal is weak or if your power supply isnt good enough 2-3Amps if not met then this will introduce a  voltage drop and might lock the GSM. Does the router have the ability to redial if the connection is dropped for any reason?
I once used a TP link and sucked big time! Worked for a while and then got stuck (USB dongle one)
Sent: Monday, November 12, 2012 2:38 PM
Subject: [lwip-users] Problems Connecting to a GSM Router
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 Sägesser
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


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