Dual LTE : Modems getting dropped

[Aleksander Morgado]

Hey

>                 We are using Quectel EC25 Dual LTE on a BPI-R64 board.
>
>                 When we try mmcli command to disable a modem
>
>                                 1.            When we disable a Modem-A, it will throw Time out error and drop that Modem-A
>
>                                 2.            When we disable Modem-A,  if it get any error, Modem-B is getting dropped.
>
>                                 3.            When we disable Modem-A,  if it get any error,  Both Modems are getting dropped.,  we see following behavior.
>

How are you disabling the modems?

>
>
>                 Currently we are using Modem Manager version 1.10 with ubuntu 18.04.
>

1.10 is extremely old, and fully unsupported, a lot of bugfixes have
happened since 1.10 was released.

>
>                 I would like to know , whether do we have support for multiple LTE in the Modem Manager.
>

Of course, yes. ModemManager can handle *any* amount of modems at the same time.

>                 When other process is executing qmicli command, if we issue mmcli commands on the same Modem,  is it handled..
>

Two warnings here:

 * If you run qmicli commands that may affect the state machine
managed by ModemManager, then ModemManager may get out of sync. You
must not send any qmicli command that may affect the state machine in
ModemManager. E.g. you can ask info from the modem with qmicli without
any issue; but you cannot update settings or any other thing in the
modem via qmicli. If you do that, you're on your own :)

* If you run qmicli commands while ModemManager is running, make sure
you always use the "-p" option in qmicli, so that the commands go
through the qmi-proxy that should have been started. If you don't do
this, you would be hijacking the modems from ModemManager, effectively
breaking the management of the devices by the MM daemon.

>
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Cheers!

-- 
Aleksander
https://aleksander.es