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Looking for recommendations on good GPRS modem solution

Submitted by Peter van Es on Mon, 07/26/2010 - 14:47

I'm looking for a recommendation on a GPRS modem solution to allow my Portux G20 to connect to the Internet so that it can collect and send mail using smtp and pop. I.e. it needs a tcp/ip stack. Does anyone have experience with USB or RS232 type devices, and PPP or similar software on the Portux?

Thanks

Peter

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Re: Looking for recommendations on good GPRS modem solution

Submitted by aehrlich on Mon, 08/02/2010 - 13:07.

We have made good experiences with the Siemens MC55i and ppp. We have not used any serial or USB modem though. We have used it built-in systems.

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Re: Looking for recommendations on good GPRS modem solution

Submitted by Matthijs on Wed, 08/04/2010 - 10:34.

We are building a system with the stamp9G20.

As GPRS/UMTS modem we chose the telit UC864 and the GC864. They have lower power consumption than the siemens(nowadays cinterion) counterparts. And are interchangeable.

When using umts, it is recommended to connect it by USB rather than serial, because serial is not fast enough for umts speeds...

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Re: Looking for recommendations on good GPRS modem solution

Submitted by Johannes on Tue, 03/29/2011 - 16:38.

We have the same combination stamp9G20+GC864. But I don't get it online. AT commands work through serial communication but PPP fails with no error.

I don't know how to setup logging for PPP on Angstrom?

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Re: Looking for recommendations on good GPRS modem solution

Submitted by aehrlich on Wed, 03/30/2011 - 09:30.

ppp is quite verbose about what it is doing, just look in /var/log/messages (take /var/log/syslog, if the log is not there), and you will see what is going wrong, if something is going wrong.

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Re: Looking for recommendations on good GPRS modem solution

Submitted by Johannes on Wed, 03/30/2011 - 16:40.

root@stamp9g20evb:~# ll /var/log/
-rw-r--r-- 1 root root 292 Mar 30 11:01 lastlog
-rw-rw-r-- 1 root root 5376 Mar 30 11:01 wtmp

root@stamp9g20evb:~# cat /etc/default/busybox-syslog
DESTINATION="buffer" # log destinations (buffer file remote)
MARKINT=20 # interval between --mark-- entries [min]
REDUCE=no # reduced-size logging
BUFFERSIZE=64 # buffer: size of circular buffer [kByte]
LOGFILE=/var/log/messages # file: where to log
ROTATESIZE=32 # file: rotate log if grown beyond X [kByte] (busybox 1.2+)
ROTATEGENS=1 # file: keep X generations of rotated logs (busybox 1.2+)
REMOTE=loghost:514 # remote: where to log
FOREGROUND=no # run in foreground (don't use!)

That's the problem. my system isn't verbose at all ... dmesg ends after system boot .. Is there anything I should switch on while making a new kernel?

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Re: Looking for recommendations on good GPRS modem solution

Submitted by aehrlich on Thu, 03/31/2011 - 13:25.

Change DESTINATION to "file" instead of "buffer".

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Re: Looking for recommendations on good GPRS modem solution

Submitted by Peter van Es on Mon, 08/09/2010 - 15:27.

Thanks... I'll look into these!

Peter

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