Reconnecting after disconnect not possible

[Bernd Eggink]

Hi,
first of all, I'm happy that I got mobile broadband working under Linux 
on my Toshiba Portege, using ModemManager and mmcli. The notebook has a 
built-in SIM port with a Sierra mobile broadband device. On Linux (Crux) 
I get an interface "wwp0s20u4c2i12" and connecting with mmcli 
--simple-connect works well - at least the first time.

However, when I disconnect, and then (after some time) try to 
re-connect, I frequently don't get a connection again. Whatever I do 
results in a timeout. Neither disabling and re-enabling the modem nor 
removing and reloading the kernel module helps; only after rebooting I 
can get a connection again.
I append part of the debug output; when the problem arises, the log 
starts reporting "unexpected messages". Could anybody have a look into it?

Thanks, Bernd

-------------------------------

ModemManager[2465]: <debug> [1430160272.228369] 
[mm-broadband-modem-mbim.c:1543] 
basic_connect_notification_signal_state(): Signal state indication: 29 
--> 93%
ModemManager[2465]: <debug> [1430160272.228516] [mm-iface-modem.c:1165] 
update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: 
signal quality updated (93)
ModemManager[2465]: <info>  [1430160282.212883] [mm-iface-modem.c:1392] 
__iface_modem_update_state_internal(): Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (enabling -> disabled)
ModemManager[2465]: <info>  [1430160282.251994] 
[mm-iface-modem-simple.c:641] connect_auth_ready(): Simple connect 
started...
ModemManager[2465]: <debug> [1430160282.252078] 
[mm-iface-modem-simple.c:651] connect_auth_ready():    PIN: unspecified
ModemManager[2465]: <debug> [1430160282.252109] 
[mm-iface-modem-simple.c:653] connect_auth_ready():    Operator ID: 
unspecified
ModemManager[2465]: <debug> [1430160282.252137] 
[mm-iface-modem-simple.c:655] connect_auth_ready():    Allowed roaming: yes
ModemManager[2465]: <debug> [1430160282.252164] 
[mm-iface-modem-simple.c:657] connect_auth_ready():    APN: internet.t-d1.de
ModemManager[2465]: <debug> [1430160282.252199] 
[mm-iface-modem-simple.c:665] connect_auth_ready():    IP family: 
unspecified
ModemManager[2465]: <debug> [1430160282.252227] 
[mm-iface-modem-simple.c:673] connect_auth_ready():    Allowed 
authentication: unspecified
ModemManager[2465]: <debug> [1430160282.252254] 
[mm-iface-modem-simple.c:675] connect_auth_ready():    User: unspecified
ModemManager[2465]: <debug> [1430160282.252351] 
[mm-iface-modem-simple.c:677] connect_auth_ready():    Password: unspecified
ModemManager[2465]: <debug> [1430160282.252381] 
[mm-iface-modem-simple.c:679] connect_auth_ready():    Number: unspecified
ModemManager[2465]: <info>  [1430160282.252405] 
[mm-iface-modem-simple.c:461] connection_step(): Simple connect state 
(3/8): Enable
ModemManager[2465]: <info>  [1430160282.252520] [mm-iface-modem.c:1392] 
__iface_modem_update_state_internal(): Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (disabled -> enabling)
ModemManager[2465]: <debug> [1430160282.252958] 
[mm-broadband-modem.c:8003] enabling_started(): Skipping modem 
initialization: not required
ModemManager[2465]: <debug> [1430160282.254681] 
[mm-broadband-modem-mbim.c:1216] parent_enabling_started_ready(): 
Couldn't start parent enabling: Couldn't open ports during modem 
enabling: Couldn't get primary port
ModemManager[2465]: [/dev/cdc-wdm0] Sent message...
<<<<<< RAW:
<<<<<<   length = 48
<<<<<<   data   = 
03:00:00:00:30:00:00:00:20:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:03:00:00:00:00:00:00:00:00:00:00:00
ModemManager[2465]: [/dev/cdc-wdm0] Sent message (translated)...
<<<<<< Header:
<<<<<<   length      = 48
<<<<<<   type        = command (0x00000003)
<<<<<<   transaction = 32
<<<<<< Fragment header:
<<<<<<   total   = 1
<<<<<<   current = 0
<<<<<< Contents:
<<<<<<   service = 'basic-connect' (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
<<<<<<   cid     = 'radio-state' (0x00000003)
<<<<<<   type    = 'query' (0x00000000)
ModemManager[2465]: [/dev/cdc-wdm0] Received message...
 >>>>>> RAW:
 >>>>>>   length = 56
 >>>>>>   data   = 
03:00:00:80:38:00:00:00:1C:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:03:00:00:00:00:00:00:00:08:00:00:00:01:00:00:00:01:00:00:00
ModemManager[2465]: [/dev/cdc-wdm0] No transaction matched in received 
message
ModemManager[2465]: [/dev/cdc-wdm0] Received unexpected message 
(translated)...
 >>>>>> Header:
 >>>>>>   length      = 56
 >>>>>>   type        = command-done (0x80000003)
 >>>>>>   transaction = 28
 >>>>>> Fragment header:
 >>>>>>   total   = 1
 >>>>>>   current = 0
 >>>>>> Contents:
 >>>>>>   status error = 'None' (0x00000000)
 >>>>>>   service      = 'basic-connect' 
(a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
 >>>>>>   cid          = 'radio-state' (0x00000003)
ModemManager[2465]: Couldn't reload current power state: Transaction 
timed out