Re: ModemManager and Thuraya XT

[Aleksander Morgado <aleksander aleksander es>]

On Wed, Jun 17, 2015 at 9:22 AM, Thomas Sailer
<sailer sailer dynip lugs ch> wrote:
> On 06/17/2015 04:58 PM, Dan Williams wrote:
> > That would seem to indicate that we need a ModemManager plugin for the XT
> > to selectively ignore COPS. Given that the modem probably only has one
> > operator and probably always searches automatically for it (unlike some
> > modems which the COPS=0 is designed to handle) it should probably be
> > ignored.
>
>
> I agree, COPS=0 should just be ignored / not sent. The Thuraya XT always
> searches for its network, and there's only one provider.
>
> > I'll bet it doesn't list anything, or it may not list any result for
> > "IPV4" contexts.
>
>
> Actually no, it does look relatively sane, it just likes to add lots of
> spaces in its response...
>
> ModemManager[13689]: <debug> [1434497907.217754] [mm-port-serial.c:1294]
> _close_internal(): (ttyACM0) device open count is 2 (close)
> ModemManager[13689]: <debug> [1434497907.217776] [mm-port-serial-at.c:440]
> debug_log(): (ttyACM0): --> 'AT+CGDCONT=?<CR>'
> ModemManager[13689]: <debug> [1434497907.252516] [mm-port-serial-at.c:440]
> debug_log(): (ttyACM0): <-- '<CR><LF>+CGDCONT: ( 1 ) , "IP" ,,,
> (0-2),(0-3)<CR><LF>'
> ModemManager[13689]: <debug> [1434497907.253963] [mm-port-serial-at.c:440]
> debug_log(): (ttyACM0): <-- '<CR><LF>+CGDCONT: , "PPP" ,,,
> (0-2),(0-3)<CR><LF>'
> ModemManager[13689]: <debug> [1434497907.254980] [mm-port-serial-at.c:440]
> debug_log(): (ttyACM0): <-- '<CR><LF>OK<CR><LF>'
>
> I added a few \\s* at the right places in the CGDCONT regexes. It works now!
> Ping latencies around 3 to 5 seconds :)

How long did it take to establish the PPP session? When I wrote the
Iridium plugin for Iridium satellite modems one of the things I had to
do is request NetworkManager to setup a longer 'ip-timeout' as the
default of 20s was really not enough, I updated it in the "iridium"
plugin to be 200s:

http://cgit.freedesktop.org/ModemManager/ModemManager/tree/plugins/iridium/mm-bearer-iridium.c#n31

Also, due to the COPS=0 thingy, we'll likely need to setup a full new
"thuraya" plugin. Thomas, would you be up to do that?

BTW; please post these patches in the ModemManager specific mailing list:
http://lists.freedesktop.org/mailman/listinfo/modemmanager-devel

Cheers!

-- 
Aleksander
https://aleksander.es