Hi Alexander,
On 07/01/2016 05:22 AM, Alexander Smirnov wrote:
Dear all,
could you please help me with the following issue. I use U-Blox
SARA-U270 modem. I'm able to online it and connect to GPRS using both:
connman and ofono-tests. The problem occurs when modem loses GSM link.
What I did:
- Boot board with ofono 1.18
- activate-context & process-context-settings
- ifconfig shows ppp0, everything works
- Disconnect physical GSM antenna, network strength becomes 0 (in
list-modems)
I doubt that this is a good way of testing out-of-coverage conditions.
You'd probably need a proper network simulator to do that...
- Connect antenna, network strength becomes 40
Problem:
After these steps, modem doesn't reconnect to GPRS, while
list-contexts shows correct settings:
[ /ublox_0 ]
[ /ublox_0/context1 ]
Username = t-mobile
AuthenticationMethod = chap
Protocol = ip
Name = Internet
Settings = { Interface=ppp0 Netmask=255.255.255.255
Method=static DomainNameServers=10.74.210.210,10.74.210.211,
Address=10.23.6.118 }
IPv6.Settings = { }
Active = 1
AccessPointName = internet.t-mobile
Password = tm
Type = internet
But I don't see ppp0 interface.
Run oFono with AT command logging enabled as well as debugging enabled.
See HACKING, 'Running from within the source code repository' section
for instructions.
An attempt to activate-context doesn't do anything, just empty output
(with enabled debugging).
Attempt to deactivate-context failed with:
Error deactivating /ublox_0/context1:
org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible
causes include: the remote application did not send a reply, the message
bus security policy blocked
Most likely because your modem's firmware itself has crashed.
The only hard modem reset helps.
Moreover, after antenna disconnect, there is no more cellular service in
ConnMan. Only daemon restart helps.
How should I handle lose GSM network events to keep ppp0 up? Why ofonod
hangs with the steps mentioned above?
oFono itself is not hung, but the underlying modem has. Remind me, is
the SARA a serial based device or USB?
Regards,
-Denis
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