Support for the Linux WWAN subsystem

[Ramon Fontes]

Dear all,

I was wondering if there is any plan to add some level of integration
between ModemManager and wwan_hwsim (e.g. expose interfaces created by
wwan_hwsim (https://github.com/torvalds/linux/blob/master/drivers/net/wwan/wwan_hwsim.c)
to ModemManager - not sure if this is the right approach though).

I recently added wwan_hwsim to Mininet-WiFi
(https://github.com/intrig-unicamp/mininet-wifi/blob/2.6/examples/wwan.py)
(even though I still can't use it as I intend) and I think I could
emulate LTE/5G with
https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/master/doc/
RUNMODEM.md.

Nowadays I can successfully use mac80211_hwsim and mac802154_hwsim for
WiFi and IEEE 802.15.4, respectively, and it would be really great to
have wwan_hwsim working with some level of integration with user space
tools such as ModemManager.

Regards,
Ramon Fontes