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Re: Modem Manager stuck in a loop, ppp can't connect.

On Wed, 2017-05-10 at 14:25 -0500, Dan Williams wrote:

On Wed, 2017-05-10 at 14:21 -0400, A. F. Cano wrote:

On Mon, May 08, 2017 at 09:27:23AM -0500, Dan Williams wrote:

...
Does the modem reply to AT+CSS with valid SID/NID values now, or
still
"?, 0"?


Interesting...

+CSS: ?, 22

OK


The device is using an early form of AT+CSS, which reports only the
CDMA System ID, which is 22.  This means the modem has registered
with
the network correctly and we can most likely do packet data.  If it
reports '0' then it's assumed that it hasn't successfully gotten
registration far enough for data.


Ok, this phone is as dumb as a brick.

I bought one off eBay and captured the USB traffic in Verizon Access
Manager in Windows.  The only things VZAM bothers to send are AT+CAD,
AT+CSQ, various GMM/GMR/GMI to get the device and firmware version,
AT+GSN for the ESN, and AT+CBC to get battery charge.  That's about it.
 Connection is #777 as usual for CDMA.

So we need to make a Motorola CDMA plugin for the e8xx phones that
bypasses the AT+CSS check entirely, and just lets the connection
proceed.  I was unable to get a usable response to AT+CSS.  I did
verify that AT+MODE=2 and AT+CIND? return roaming and service status,
so we could possibly use that instead of just ignoring AT+CSS.

Either way, this phone needs a new plugin.

Dan


When connecting to the modem (with kermit) echo was off so my
command
isn't visible, but it did return the above.  What does the 22 mean
or
imply?

I have also noticed these warnings:

May  6 19:12:40 fbx ModemManager[277]: <warn>  Could not get
service
status: No AT port available to run command
May  6 19:13:10 fbx ModemManager[277]: <warn>  Could not get
service
status: No AT port available to run command
May  6 19:13:40 fbx ModemManager[277]: <warn>  Could not get
service
status: No AT port available to run command
May  6 19:14:10 fbx ModemManager[277]: <warn>  Could not get
service
status: No AT port available to run command


The modem only has one serial port, and that's taken by PPP when the
data connection is active.  This means there's no port available to
run
the status commands.  But it's a bug this is printed at a <warn> log
level rather than <debug> or something like that.  Anyway, the
message
is expected and harmless.


And they keep repeating every 30 seconds.

I have encountered this the last time I connected.  The ppp
connection
was working fine but this message kept repeating the whole time the
connection was up:

May  9 21:02:06 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:07 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer


This would be a bug in NetworkManager.  Any chance that, when this
happens, you could 'gdb attach <pid of NetworkManager>', then 'break
g_log', then 'continue'.  Then next time it breaks out to the '(gdb)'
prompt, run "t a a bt" to get a backtrace.  That will likely tell us
where the issue is.

Dan


May  9 21:02:07 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:08 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:08 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:09 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:09 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:11 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:11 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:12 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:12 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:13 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:13 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:14 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:14 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:15 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:15 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:16 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:16 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:17 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:17 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:18 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:18 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:19 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:19 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:20 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:20 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
May  9 21:02:23 fbx NetworkManager[379]: instance with invalid
(NULL)
class pointer
May  9 21:02:23 fbx NetworkManager[379]: g_signal_emit_valist:
assertion 'G

At about 2 per second, the log file quickly becomes pretty huge.

Thanks again for replying.


Augustine

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