Re: Serial device detection not working

[Aleksander Morgado <aleksander lanedo com>]

Hey Thomas,

> i had an active connection (latest MM_06 from git) with the iridium
> modem but after a while, the modem disconnected. After that, the modem
> was no longer detected by MM.
> Then i tried to redetect serial modems but without success.
>
> dbus-send --system --type=method_call --print-reply
> --dest=org.freedesktop.ModemManager /org/freedesktop/ModemManager
> org.freedesktop.ModemManager.ScanDevices
>
> modem-manager[4232]: <debug> [mm-manager.c:1057] mm_manager_start():
> Starting device scan...
> modem-manager[4232]: <debug> [mm-manager.c:875] device_added():
> (tty/ttyS0): port's parent platform driver is not whitelisted
> modem-manager[4232]: <debug> [mm-manager.c:875] device_added():
> (tty/ttyS2): port's parent platform driver is not whitelisted
> modem-manager[4232]: <debug> [mm-manager.c:875] device_added():
> (tty/ttyS4): port's parent platform driver is not whitelisted
> modem-manager[4232]: <debug> [mm-manager.c:875] device_added():
> (net/usb0): port's parent platform driver is not whitelisted
> modem-manager[4232]: <debug> [mm-manager.c:1075] mm_manager_start():
> Finished device scan...


ttyS1, the port where the Iridium modem is plugged in, wasn't released 
yet by the Modem object, so the re-scan wasn't considering it yet. The 
Iridium plugin, as well as the Cinterion one, have a special setup so 
that if 3 consecutive AT commands get timed out we mark the modem as 
invalid and it gets removed, releasing all its ports.

Once the modem got disconnected, did MM detect the disconnection? did it 
try to send AT commands, or was it just stuck somehow? Would have been 
good to have the logs just while the disconnection happened, if any. In 
theory, MM should have detected the disconnection, marked the AT port as 
not being connected, and it should have tried to keep on sending AT 
commands (e.g. to update signal quality), and after the 3rd AT command 
timed out it would have been removed. For some reason, this sequence 
didn't happen.

--
Aleksander