Hey Amol,
>
> We are getting following error when trying to send pin to the SIM card. The
> problem is not observed in MM 1.20.4. However, please note that the SIM card
> does unlocks after the below command even though error is reported.
>
> # mmcli -i 0 --pin=1234
> error: couldn't send PIN code to the SIM:
> 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Failed: Couldn't get
> interface skeleton'
>
> Now, after looking through the code, following change is causing this issue.
> This change was not present in 1.20.4
> ----
> mm-broadband-modem-mbim.c:
> if ((self->priv->enabled_cache.last_ready_state !=
> MBIM_SUBSCRIBER_READY_STATE_DEVICE_LOCKED &&
> ready_state == MBIM_SUBSCRIBER_READY_STATE_DEVICE_LOCKED) ||
> (self->priv->enabled_cache.last_ready_state ==
> MBIM_SUBSCRIBER_READY_STATE_DEVICE_LOCKED &&
> ready_state != MBIM_SUBSCRIBER_READY_STATE_DEVICE_LOCKED)) {
> mm_obj_dbg (self, "Lock state change detected");
> active_sim_event = TRUE;
> }
>
> self->priv->enabled_cache.last_ready_state = ready_state;
>
> if (active_sim_event) {
> mm_iface_modem_process_sim_event (MM_IFACE_MODEM (self));
> }
> ----
> What is happening is when SIM PIN lock state changes then
> mm_iface_modem_process_sim_event () is called which eventually calls
> mm_base_modem_set_reprobe(). The reprobe, "unexports" the current modem
> instance (modem 0) and recreates a new modem instance (1). As a result, the
> above mmcli command is reporting error. I'm not sure why this should happen
> for SIM Lock state change.
I think this has been fixed in MM git main branch; is there any chance
you could test with that? See
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/commit/19fd9c634b8f2876694d18a77a3b686a0c08bf34
--
Aleksander
