Hello guys!!

After some time, I am playing again with modes setting.

Maybe it's absolutely normal, bt I am facing a situation where mode changes 
don't take effect apparently. Or, put another way:

root@OpenWrt:~# mmcli -m 0 --set-allowed-modes="any" --set-preferred-mode="none"
successfully set current modes in the modem
root@OpenWrt:~# mmcli -m 0 |grep -i "current: allowed"
           |              current: allowed: 2g, 3g, 4g; preferred: 4g
root@OpenWrt:~#

and mo matter, I am not able to set the preference to none.
Is this due to modem firmware not supporting this?
manufacturer: QUALCOMM INCORPORATED
model: QUECTEL Mobile Broadband Module
Firmware revision: EC25EFAR02A08M4G
Carrier config: default
h/w revision: 10000

Modes list:
supported: allowed: 2g; preferred: none
           allowed: 3g; preferred: none
           allowed: 4g; preferred: none
           allowed: 2g, 3g; preferred: 3g
           allowed: 2g, 3g; preferred: 2g
           allowed: 2g, 4g; preferred: 4g
           allowed: 2g, 4g; preferred: 2g
           allowed: 3g, 4g; preferred: 3g
           allowed: 3g, 4g; preferred: 4g
           allowed: 2g, 3g, 4g; preferred: 4g
           allowed: 2g, 3g, 4g; preferred: 3g
           allowed: 2g, 3g, 4g; preferred: 2g
current: allowed: 2g, 3g, 4g; preferred: 4g

Secondly: in our application we perform a fair amount of async calls. In 
exceptional cases where we care about order and operation completion, we do 
sync calls, but in most cases we use async operations.
I am clearly facing the issue of the program segfaulting sometimes when some 
operations are still pending at exit. I imagine I should use a GCancellable for 
that.
Could you give me any direction? Since I don't know at any given moments how 
many async operations are in progress.
Thank you very very much to all of you reading this message.

Enrico
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