sim hot swap problem with Telit GE910-QUAD

[Tim Small]

Hello,

When probing a Telit GE910-QUAD (with a SIM inserted) mm always gives me
something like this in the debug logs:

ModemManager[26945]: <debug> (ttyUSB0) device open count is 2 (close)
ModemManager[26945]: <debug> (ttyUSB0): --> 'AT#QSS?<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>#'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'Q'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'S'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'S'
ModemManager[26945]: <debug> (ttyUSB0): <-- ':'
ModemManager[26945]: <debug> (ttyUSB0): <-- ' '
ModemManager[26945]: <debug> (ttyUSB0): <-- '1'
ModemManager[26945]: <debug> (ttyUSB0): <-- ','
ModemManager[26945]: <debug> (ttyUSB0): <-- '0'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'OK'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>'
ModemManager[26945]: <info>  QSS: current status is 'sim-removed'
ModemManager[26945]: <debug> (ttyUSB0) device open count is 3 (open)
ModemManager[26945]: <debug> (ttyUSB0) device open count is 2 (close)
ModemManager[26945]: <debug> (ttyUSB0): --> 'AT#QSS=1<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>OK'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>'
ModemManager[26945]: <debug> Iface modem: SIM hot swap setup succeded
ModemManager[26945]: <debug> checking if unlock required...
ModemManager[26945]: <debug> (ttyUSB0) device open count is 3 (open)
ModemManager[26945]: <debug> (ttyUSB0) device open count is 2 (close)
ModemManager[26945]: <debug> (ttyUSB0): --> 'AT+CPIN?<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>+'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'C'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'M'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'E'
ModemManager[26945]: <debug> (ttyUSB0): <-- ' '
ModemManager[26945]: <debug> (ttyUSB0): <-- 'E'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'R'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'R'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'O'
ModemManager[26945]: <debug> (ttyUSB0): <-- 'R'
ModemManager[26945]: <debug> (ttyUSB0): <-- ':'
ModemManager[26945]: <debug> (ttyUSB0): <-- ' '
ModemManager[26945]: <debug> (ttyUSB0): <-- '1'
ModemManager[26945]: <debug> (ttyUSB0): <-- '0'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<CR>'
ModemManager[26945]: <debug> (ttyUSB0): <-- '<LF>'
ModemManager[26945]: <debug> Got failure code 10: SIM not inserted
ModemManager[26945]: <debug> Couldn't check if unlock required: 'SIM not
inserted'
ModemManager[26945]: <info>  Modem: state changed (unknown -> failed)
ModemManager[26945]: <warn>  Modem couldn't be initialized: Couldn't
check unlock status: SIM not inserted
ModemManager[26945]: <debug> (ttyUSB0) device open count is 1 (close)
ModemManager[26945]: <debug> Couldn't initialize interface: 'Firmware
interface not available'
ModemManager[26945]: <debug> Creating ports context for SIM hot swap
ModemManager[26945]: <debug> (ttyUSB0) device open count is 2 (open)
ModemManager[26945]: <info>  SIM is missing, but the modem supports SIM
hot swap. Waiting for SIM...
ModemManager[26945]: <debug> Couldn't finish initialization in the
current state: 'Modem is unusable due to SIM missing, cannot fully
initialize, waiting for SIM insertion.'
ModemManager[26945]: <debug> [device
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-9] exported modem at path
'/org/freedesktop/ModemManager1/Modem/0'
ModemManager[26945]: <debug> [device
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-9]    plugin:  Telit
ModemManager[26945]: <debug> [device
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-9]    vid:pid: 0x067B:0x2303
ModemManager[26945]: <debug> (ttyUSB0) device open count is 1 (close)


... If I then Ctrl-C ModemManager, and open up a terminal program, and
issue "AT+CPIN?" I get:

+CPIN: READY

OK

I think that the commands which mm issue causes it to close and reopen
the SIM and this takes longer than mm is giving it.  How should I work
around this?

See also:

https://gist.github.com/tim-seoss/577082a6aa9041a9e79e07e9d7f9adf0

Cheers,

Tim.