### syslog
Aug  2 16:38:33 armadillo NetworkManager[540]: <info>  [1627889913.0631] device (ttyACM0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
Aug  2 16:40:11 armadillo NetworkManager[540]: <info>  [1627890011.4622] agent-manager: req[0x760c80, :1.43/nmcli-connect/0]: agent registered
Aug  2 16:40:11 armadillo NetworkManager[540]: <info>  [1627890011.4767] device (ttyACM0): Activation: starting connection 'gsm-ttyACM0' (xxxxxxxx-86f4-4a9b-9c49-xxxxxxxxxxxx)
Aug  2 16:40:11 armadillo NetworkManager[540]: <info>  [1627890011.4774] audit: op="connection-activate" uuid="xxxxxxxx-86f4-4a9b-9c49-xxxxxxxxxxxx" name="gsm-ttyACM0" pid=3518 uid=0 result="success"
Aug  2 16:40:11 armadillo NetworkManager[540]: <info>  [1627890011.4788] device (ttyACM0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Aug  2 16:40:11 armadillo NetworkManager[540]: <info>  [1627890011.4873] device (ttyACM0): state change: prepare -> need-auth (reason 'none', sys-iface-state: 'managed')
Aug  2 16:40:11 armadillo NetworkManager[540]: <info>  [1627890011.5044] device (ttyACM0): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
Aug  2 16:40:11 armadillo NetworkManager[540]: <info>  [1627890011.5365] modem["ttyACM0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Aug  2 16:40:12 armadillo NetworkManager[540]: <info>  [1627890012.1046] modem["ttyACM0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Aug  2 16:40:12 armadillo NetworkManager[540]: <info>  [1627890012.1261] modem["ttyACM0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Aug  2 16:40:12 armadillo NetworkManager[540]: <info>  [1627890012.6906] modem["ttyACM0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Aug  2 16:40:12 armadillo NetworkManager[540]: <info>  [1627890012.7120] modem["ttyACM0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Aug  2 16:40:13 armadillo NetworkManager[540]: <info>  [1627890013.2783] modem["ttyACM0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Aug  2 16:40:13 armadillo NetworkManager[540]: <warn>  [1627890013.2809] modem-broadband[ttyACM0]: failed to connect modem: Unknown error
Aug  2 16:40:13 armadillo NetworkManager[540]: <info>  [1627890013.2810] device (ttyACM0): state change: prepare -> failed (reason 'unknown', sys-iface-state: 'managed')
Aug  2 16:40:13 armadillo NetworkManager[540]: <warn>  [1627890013.2875] device (ttyACM0): Activation: failed for connection 'gsm-ttyACM0'