Hey, On Thu, Jul 19, 2018 at 3:47 PM, Matthew Starr <mst...@hedonline.com> wrote: > I am running ModemManager 1.8.0 and NetworkManager 1.8.0 on an embedded > device with the Linux OS built by buildroot. I am using a u-blox TOBY-R200 > cell modem connected over USB with virtual serial interfaces /dev/ttyACM0 > through /dev/ttyACM5. > > Sometimes while connected to the cellular network for a longer period of time > (sometimes around 200 minutes, other times I have reached over 800 minutes), > ModemManager will report a modem hangup that was not initiated by user action > or loss of signal since this is a stationary device that is being tested. > Usually ModemManager will reconnect with NetworkManager prompting for the > associated cell profile to be reconnected. My issue is that sometimes no > matter how many times I try or auto reconnects are tried, ModemManager cannot > reestablish a data connection. ModemManager just keeps reporting that it > can't open /dev/ttyACM0 which is was using just fine before. The interesting > thing is that if I restart ModemManager, it is able to open the /dev/ttyACM0 > port right away and make a data connection again, so it doesn't look to be an > issue with the modem causing serial port issues. This looks to be some sort > of serial port handling issue in ModemManager, maybe just related to u-blox > but I am not sure. I looked at the state of the /dev/ttyACM0 device using > lsof and it is not reporting that any other process has that device file open > or locked. >
These seem relevant, yes: > Jul 19 12:52:31 canect2 daemon.warn ModemManager[302]: <warn> Couldn't load > Operator Code: 'Cannot run sequence: 'Could not open serial device ttyACM0: > it has been forced close'' > Jul 19 12:52:31 canect2 daemon.warn ModemManager[302]: <warn> Couldn't load > Operator Name: 'Cannot run sequence: 'Could not open serial device ttyACM0: > it has been forced close'' ... Any chance you can get a debug output of MM while reproducing this issue? -- Aleksander https://aleksander.es _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
