Hey Jeff, > I'm running a Sierra Wireless MC7455 modem with SWI9X30C_02.32.11.00 r8042 > CARMD-EV-FRMWR2 firmware. Using ModemManager 1.18.2 on Ubuntu 20.04. > > I can get the modem to connect using mmcli -m 0 --simple-connect=. when the > modem is in MBIM mode. > I can get the modem to connect using qmicli and qmi-network when the modem is > in QMI mode. > > But when I use mmcli with ModemManager, --simple-connect fails with > > error: couldn't connect the modem: > 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Cancelled: operation > cancelled' >
Oh, that is very strange. > What is strange is that the modem seems to create a default bearer channel > when it is enabled. Using simple-connect seems to create a second bearer > channel which is rejected. But using -connect on the default bearer channel > also fails. > The default bearer when enabled is the "initial EPS default bearer". In ModemManager, this is an informative bearer object exclusively, you cannot use it to trigger a connection. When simple connect creates the new bearer, that's the one that should end up connected. > > Using simple connect results in two bearers. > > root@de-01:~# mmcli -m 1 --simple-connect='apn=broadband' > error: couldn't connect the modem: > 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Cancelled: operation > cancelled' This is what we need to understand. Could you gather MM daemon debug logs while you attempt this simple-connect operation? https://modemmanager.org/docs/modemmanager/debugging/ -- Aleksander https://aleksander.es
