armadillo:~# nmcli connection add type gsm ifname ttyCommModem
Connection 'gsm-ttyCommModem' (11024403-b34d-4177-ba00-98752523ad6c) successfully added.
armadillo:~# nmcli connection modify gsm-ttyCommModem +gsm.apn i-aeonmobile.com
armadillo:~# nmcli connection modify gsm-ttyCommModem +gsm.username user
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-eap no
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-pap yes
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-chap no
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-mschap no
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-mschapv2 no
armadillo:~# nmcli connection modify gsm-ttyCommModem +gsm.password 0000
armadillo:~# nmcli connection up gsm-ttyCommModem
Error: Connection activation failed: The base network connection was interrupted
armadillo:~# nmcli connection up gsm-ttyCommModem
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/11)
armadillo:~# nmcli con del gsm-ttyCommModem
Connection 'gsm-ttyCommModem' (11024403-b34d-4177-ba00-98752523ad6c) successfully deleted.
armadillo:~# nmcli connection add type gsm ifname ttyCommModem
Connection 'gsm-ttyCommModem' (732d19d4-4aab-413e-8ba0-0a09942766dd) successfully added.
armadillo:~# nmcli connection modify gsm-ttyCommModem +gsm.apn i-aeonmobile.com
armadillo:~# nmcli connection modify gsm-ttyCommModem +gsm.username user
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-eap yes
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-pap no
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-chap yes
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-mschap yes
armadillo:~# nmcli connection modify gsm-ttyCommModem +ppp.refuse-mschapv2 yes
armadillo:~# nmcli connection modify gsm-ttyCommModem +gsm.password 0000
armadillo:~# nmcli connection up gsm-ttyCommModem
Error: Connection activation failed: No suitable device found for this connection (device eth0 not available because profile is not compatible with device (mismatching interface name)).
armadillo:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN qlen 1000
    link/ether 00:11:0c:39:00:aa brd ff:ff:ff:ff:ff:ff
3: mlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
    link/ether 4a:4c:07:8c:b4:0e brd ff:ff:ff:ff:ff:ff
4: uap0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether fe:84:a7:51:f9:04 brd ff:ff:ff:ff:ff:ff
armadillo:~# ls -l /etc/NetworkManager/system-connections/
total 4
-rw-------    1 root     root           319 Jun 11 11:40 gsm-ttyCommModem.nmconnection
armadillo:~# cat /etc/NetworkManager/system-connections/gsm-ttyCommModem.nmconne
ction
[connection]
id=gsm-ttyCommModem
uuid=732d19d4-4aab-413e-8ba0-0a09942766dd
type=gsm
interface-name=ttyCommModem

[gsm]
apn=i-aeonmobile.com
password=0000
username=user

[ppp]
refuse-chap=true
refuse-eap=true
refuse-mschap=true
refuse-mschapv2=true

[ipv4]
method=auto

[ipv6]
addr-gen-mode=default
method=auto

[proxy]
armadillo:~#