primary device changing from boot to boot

Tue Sep 5 20:59:01 UTC 2017

On Tue, 2017-09-05 at 12:32 -0700, Tim Harvey wrote:
> On Tue, Sep 5, 2017 at 9:53 AM, Dan Williams <dcbw at redhat.com> wrote:
> > On Tue, 2017-09-05 at 09:38 -0700, Tim Harvey wrote:
> > > On Fri, Sep 1, 2017 at 1:22 PM, Dan Williams <dcbw at redhat.com>
> > > wrote:
> > > > On Fri, 2017-09-01 at 13:01 -0700, Tim Harvey wrote:
> > > > > Greetings,
> > > > > 
> > > > > I've got a Sierra Wireless HL7588 modem which exposes three
> > > > > ttyACM
> > > > > devs via the cdc_acm driver. The device appears to work fine
> > > > > with
> > > > > ModemManager (1.6.8) but occasionally mm detects the primary
> > > > > device
> > > > > as
> > > > > ttyACM2 instead of the usuall ttyACM0. In this case (detected
> > > > > primary
> > > > > AT interface of ttyACM2), if I've already configured
> > > > > NetworkManager
> > > > > to
> > > > > use /dev/ttyACM0 I can't bring up the modem.
> > > > 
> > > > NM has a "DeviceIdentifier" property on GSM connections partly
> > > > for
> > > > this
> > > > reason.  You cannot always guarantee that even if MM *did*
> > > > detect
> > > > the
> > > > first exposed TTY as primary, that it's going to be called
> > > > ttyACM0.
> > > > The kernel is free to name these things whatever it wants, and
> > > > if
> > > > ttyACM0 is already used it'll pick another one.  I've had this
> > > > happen
> > > > when some program holds the TTY open and the modem reboots.
> > > > 
> > > > So moral of the story is, don't depend on device names.
> > > > 
> > > > Get the MM device identifier from the modem:
> > > > 
> > > > dbus-send --print-reply --system --
> > > > dest=org.freedesktop.ModemManager1
> > > > /org/freedesktop/ModemManager1/Modem/0
> > > > org.freedesktop.DBus.Properties.Get
> > > > string:org.freedesktop.ModemManager1.Modem
> > > > string:DeviceIdentifier
> > > > 
> > > > and then set that string as the DeviceIdentifier in the
> > > > NetworkManager
> > > > connection for the modem.  That connection will then only ever
> > > > apply to
> > > > that specific modem.  You can then do things liek "nmcli con up
> > > > <connection mame>" and NM will figure out what device it should
> > > > use.
> > > > 
> > > 
> > > Dan,
> > > 
> > > This makes sense, but how do I configure NetworkManager to use
> > > the
> > > device-id? I don't see it as an available option for type gsm, so
> > > perhaps I need to edit the file in
> > > /etc/NetworkManager/system-connections/mymodem and add it to the
> > > 'gsm'
> > 
> > nmcli con mod <connection name> gsm.device-id \
> >     6909b49a4d44867387a2b09b8095c579e031874c
> > 
> > Or yeah, drop:
> > 
> > device-id=6909b49a4d44867387a2b09b8095c579e031874c
> > 
> > into the [gsm] section of the keyfile in
> > /etc/NetworkManager/system-
> > connections.
> > 
> 
> Using 'device-id' does not appear to not work, at least not in NM
> 1.2.6:

1.2.6 should have the right support.  Perhaps I didn't quite understand
what you were asking though.

device-id is useful if you have multiple modems on a system, or if you
swap modems between systems and want a connection to apply to a
specific device.

But your original question was about device naming, and ACM0 vs. ACM2. 
For some modems, it shouldn't matter what the interface name is.  So in
your case, you wouldn't do anything to "configured NetworkManager to
use /dev/ttyACM0", you'd simply set the device-id and then use the NM
connection name to start/stop things.  You wouldn't hardcode "nmcli dev
connect ttyACM0" or anything like that.

Instead you'd "nmcli con up Verizon" and the device-id would tell NM to
use the right device, no matter whether ACM0, ACM2, or USB3 or
whatever.

Basically, you don't want to hardcode tty device names ever, because
they can and do change.  So if you're doing that somewhere, I'd
recommend instead using the NM connection name, and device-id to make
sure the connection always applies to that specific modem.

Dan

> root at ventana:~# dbus-send --print-reply --system \
>    --dest=org.freedesktop.ModemManager1 \
>    /org/freedesktop/ModemManager1/Modem/0 \
>    org.freedesktop.DBus.Properties.Get \
>    string:org.freedesktop.ModemManager1.Modem string:DeviceIdentifier
> method return time=1504639000.492891 sender=:1.2 -> destination=:1.11
> serial=36 reply_serial=2
>    variant       string "6909b49a4d44867387a2b09b8095c579e031874c"
> 
> 
> root at ventana:~# ls /etc/NetworkManager/system-connections
> mymodem
> 
> root at ventana:~# cat /etc/NetworkManager/system-connections/mymodem
> [connection]
> id=mymodem
> uuid=8ab55a09-43b0-430d-807a-1773ba22d605
> type=gsm
> interface-name=ttyACM0
> permissions=
> secondaries=
> 
> [gsm]
> apn=vzwinternet
> number=*99#
> device-id=6909b49a4d44867387a2b09b8095c579e031874c
> 
> [ipv4]
> dns-search=
> method=auto
> 
> [ipv6]
> addr-gen-mode=stable-privacy
> dns-search=
> method=auto
> 
> root at ventana:~# mmcli -m 0
> 
> /org/freedesktop/ModemManager1/Modem/0 (device id
> '6909b49a4d44867387a2b09b8095c579e031874c')
>   -------------------------
>   Hardware |   manufacturer: 'Sierra Wireless'
>            |          model: 'HL7588'
>            |       revision:
> 'RHL75xx.V.3.7.151600.201702071034.x7160_1'
>            |      supported: 'gsm-umts, lte'
>            |        current: 'gsm-umts, lte'
>            |   equipment id: '014284000070452'
>   -------------------------
>   System   |         device:
> '/sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1'
>            |        drivers: 'cdc_acm, cdc_ncm'
>            |         plugin: 'Generic'
>            |   primary port: 'ttyACM2'
>            |          ports: 'ttyACM2 (at), wwx000011121314 (net),
> wwx000011121316 (net), wwx00001112131a (net), wwx000011121318 (net),
> ttyACM0 (at)'
>   -------------------------
>   Numbers  |           own : '+19529136397'
>   -------------------------
>   Status   |           lock: 'none'
>            | unlock retries: 'unknown'
>            |          state: 'registered'
>            |    power state: 'on'
>            |    access tech: 'lte'
>            | signal quality: '19' (recent)
>   -------------------------
>   Modes    |      supported: 'allowed: 2g, 3g, 4g; preferred: none'
>            |        current: 'allowed: 2g, 3g, 4g; preferred: none'
>   -------------------------
>   Bands    |      supported: 'unknown'
>            |        current: 'unknown'
>   -------------------------
>   IP       |      supported: 'ipv4, ipv6, ipv4v6'
>   -------------------------
>   3GPP     |           imei: '014284000070452'
>            |  enabled locks: 'none'
>            |    operator id: '311480'
>            |  operator name: 'Verizon'
>            |   subscription: 'unknown'
>            |   registration: 'home'
>   -------------------------
>   SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'
> 
>   -------------------------
>   Bearers  |          paths: 'none'
> 
> root at ventana:~# nmcli device status
> DEVICE   TYPE      STATE         CONNECTION
> ttyACM2  gsm       disconnected  --
> eth0     ethernet  unavailable   --
> can0     can       unmanaged     --
> lo       loopback  unmanaged     --
> ^^^^ not able to connect when ttyACM2 is the primary
> 
> Here's NM log in case that sheds light on the issue:
> 
> root at ventana:~# journalctl -u NetworkManager
> -- Logs begin at Thu 2016-02-11 16:28:01 UTC, end at Tue 2017-09-05
> 19:17:51 UTC. --
> Sep 05 19:12:49 ventana systemd[1]: NetworkManager.service: About to
> execute: /usr/sbin/NetworkManager --no-daemon
> Sep 05 19:12:49 ventana systemd[1]: NetworkManager.service: Forked
> /usr/sbin/NetworkManager as 291
> Sep 05 19:12:49 ventana systemd[1]: NetworkManager.service: Changed
> dead -> start
> Sep 05 19:12:49 ventana systemd[1]: Starting Network Manager...
> Sep 05 19:12:49 ventana systemd[291]: NetworkManager.service:
> Executing: /usr/sbin/NetworkManager --no-daemon
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.2151]
> NetworkManager (version 1.2.6) is starting...
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.2181]
> Read config: /etc/NetworkManager/NetworkManager.conf (etc:
> default-wifi-powersave-on.conf)
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.2880]
> manager[0xb240f8]: monitoring kernel firmware directory
> '/lib/firmware'.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.2883]
> monitoring ifupdown state file '/run/network/ifstate'.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.3103]
> dns-mgr[0xb15cb0]: init: dns=dnsmasq, rc-manager=resolvconf,
> plugin=dnsmasq
> Sep 05 19:12:50 ventana systemd[1]: NetworkManager.service: D-Bus
> name
> org.freedesktop.NetworkManager changed owner from  to :1.3
> Sep 05 19:12:50 ventana systemd[1]: NetworkManager.service: Changed
> start -> running
> Sep 05 19:12:50 ventana systemd[1]: NetworkManager.service: Job
> NetworkManager.service/start finished, result=done
> Sep 05 19:12:50 ventana systemd[1]: Started Network Manager.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5646] init!
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5654]
>       interface-parser: parsing file /etc/network/interfaces
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <warn>  [1504638770.5671]
> ignoring out-of-block data 'source-directory
> /etc/network/interfaces.d'
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5694]
>       interface-parser: finished parsing file /etc/network/interfaces
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5706]
> management mode: unmanaged
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5738]
> devices added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2188000.ethernet/net/eth0,
> iface: eth0)
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5740]
> device added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2188000.ethernet/net/eth0,
> iface: eth0): no ifupdown configuration found.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5755]
> devices added (path: /sys/devices/virtual/net/lo, iface: lo)
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5781]
> device added (path: /sys/devices/virtual/net/lo, iface: lo): no
> ifupdown configuration found.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5803]
> end _init.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5822]
> settings: loaded plugin ifupdown: (C) 2008 Canonical Ltd.  To report
> bugs please use the NetworkManager mailing list.
> (/usr/lib/arm-linux-gnueabihf/NetworkManager/libnm-settings-plugin-
> ifupdown.so)
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5841]
> settings: loaded plugin keyfile: (c) 2007 - 2015 Red Hat, Inc.  To
> report bugs please use the NetworkManager mailing list.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.5993]
> SettingsPlugin-Ofono: init!
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <warn>  [1504638770.6030]
> SettingsPlugin-Ofono: file doesn't exist: /var/lib/ofono
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.6078]
> SettingsPlugin-Ofono: end _init.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.6130]
> settings: loaded plugin ofono: (C) 2013-2016 Canonical Ltd.  To
> report
> bugs please use the NetworkManager mailing list.
> (/usr/lib/arm-linux-gnueabihf/NetworkManager/libnm-settings-plugin-
> ofono.so)
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.6156]
> (11767600) ... get_connections.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.6182]
> (11767600) ... get_connections (managed=false): return empty list.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.7678]
> keyfile: new connection /etc/NetworkManager/system-
> connections/mymodem
> (8ab55a09-43b0-430d-807a-1773ba22d605,"mymodem")
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.7722]
> SettingsPlugin-Ofono: (11767720) ... get_connections.
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.7724]
> SettingsPlugin-Ofono: (11767720) connections count: 0
> Sep 05 19:12:50 ventana NetworkManager[291]:
> <info>  [1504638770.7729]
> get unmanaged devices count: 0
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2656]
> settings: hostname: using hostnamed
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2658]
> settings: hostname changed from (none) to "ventana"
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2670]
> Using DHCP client 'dhclient'
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2672]
> manager: WiFi enabled by radio killswitch; enabled by state file
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2674]
> manager: WWAN enabled by radio killswitch; enabled by state file
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2676]
> manager: Networking is enabled by state file
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2679]
> Loaded device plugin: NMVxlanFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2681]
> Loaded device plugin: NMVlanFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2683]
> Loaded device plugin: NMVethFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2685]
> Loaded device plugin: NMTunFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2687]
> Loaded device plugin: NMMacvlanFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2688]
> Loaded device plugin: NMIPTunnelFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2690]
> Loaded device plugin: NMInfinibandFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2692]
> Loaded device plugin: NMEthernetFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2695]
> Loaded device plugin: NMBridgeFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.2696]
> Loaded device plugin: NMBondFactory (internal)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.3260]
> Loaded device plugin: NMBluezManager
> (/usr/lib/arm-linux-gnueabihf/NetworkManager/libnm-device-plugin-
> bluetooth.so)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.3927]
> Loaded device plugin: NMWwanFactory
> (/usr/lib/arm-linux-gnueabihf/NetworkManager/libnm-device-plugin-
> wwan.so)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.4155]
> Loaded device plugin: NMWifiFactory
> (/usr/lib/arm-linux-gnueabihf/NetworkManager/libnm-device-plugin-
> wifi.so)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.4510]
> Loaded device plugin: NMAtmManager
> (/usr/lib/arm-linux-gnueabihf/NetworkManager/libnm-device-plugin-
> adsl.so)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.4581]
> device (lo): link connected
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.4683]
> manager: (lo): new Generic device
> (/org/freedesktop/NetworkManager/Devices/0)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <warn>  [1504638771.4716]
> device (eth0): failed to find device 2 'eth0' with udev
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.4835]
> manager: (eth0): new Ethernet device
> (/org/freedesktop/NetworkManager/Devices/1)
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.4974]
> manager: startup complete
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.5621]
> urfkill disappeared from the bus
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.5785]
> ModemManager available in the bus
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.5917]
> ofono is now available
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <warn>  [1504638771.5973]
> failed to enumerate oFono devices:
> GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.ofono was not provided by any .service files
> Sep 05 19:12:51 ventana NetworkManager[291]:
> nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed
> Sep 05 19:12:51 ventana NetworkManager[291]:
> <info>  [1504638771.9398]
> manager: (can0): new Generic device
> (/org/freedesktop/NetworkManager/Devices/2)
> Sep 05 19:12:52 ventana NetworkManager[291]:
> <info>  [1504638772.7851]
> devices added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2188000.ethernet/net/eth0,
> iface: eth0)
> Sep 05 19:12:52 ventana NetworkManager[291]:
> <info>  [1504638772.7853]
> device added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2188000.ethernet/net/eth0,
> iface: eth0): no ifupdown configuration found.
> Sep 05 19:12:52 ventana NetworkManager[291]:
> <info>  [1504638772.7865]
> device (eth0): state change: unmanaged -> unavailable (reason
> 'managed') [10 20 2]
> Sep 05 19:12:52 ventana NetworkManager[291]:
> <info>  [1504638772.8562]
> keyfile: add connection in-memory
> (31c82493-a694-336f-a7e3-df589c1e43fe,"Wired connection 1")
> Sep 05 19:12:52 ventana NetworkManager[291]:
> <info>  [1504638772.8650]
> settings: (eth0): created default wired connection 'Wired connection
> 1'
> Sep 05 19:12:53 ventana NetworkManager[291]:
> <info>  [1504638773.1879]
> devices added (path: /sys/devices/virtual/net/lo, iface: lo)
> Sep 05 19:12:53 ventana NetworkManager[291]:
> <info>  [1504638773.1936]
> device added (path: /sys/devices/virtual/net/lo, iface: lo): no
> ifupdown configuration found.
> Sep 05 19:12:53 ventana NetworkManager[291]:
> <info>  [1504638773.8825]
> devices added (path:
> /sys/devices/soc0/soc/2000000.aips-bus/2090000.flexcan/net/can0,
> iface: can0)
> Sep 05 19:12:53 ventana NetworkManager[291]:
> <info>  [1504638773.8827]
> device added (path:
> /sys/devices/soc0/soc/2000000.aips-bus/2090000.flexcan/net/can0,
> iface: can0): no ifupdown configuration found.
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.7653]
> devices added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.12/net/wwx00001112131a,
> iface: wwx00001112131a)
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.7655]
> device added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.12/net/wwx00001112131a,
> iface: wwx00001112131a): no ifupdown configuration found.
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.8066]
> devices added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.8/net/wwx000011121316,
> iface: wwx000011121316)
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.8068]
> device added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.8/net/wwx000011121316,
> iface: wwx000011121316): no ifupdown configuration found.
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.8278]
> devices added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.6/net/wwx000011121314,
> iface: wwx000011121314)
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.8279]
> device added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.6/net/wwx000011121314,
> iface: wwx000011121314): no ifupdown configuration found.
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.9195]
> devices added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.10/net/wwx000011121318,
> iface: wwx000011121318)
> Sep 05 19:12:54 ventana NetworkManager[291]:
> <info>  [1504638774.9197]
> device added (path:
> /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-
> 1/2-1:1.10/net/wwx000011121318,
> iface: wwx000011121318): no ifupdown configuration found.
> Sep 05 19:13:00 ventana NetworkManager[291]:
> <info>  [1504638780.0730]
> manager: WiFi hardware radio set enabled
> Sep 05 19:13:00 ventana NetworkManager[291]:
> <info>  [1504638780.0732]
> manager: WWAN hardware radio set enabled
> Sep 05 19:13:12 ventana NetworkManager[291]:
> <info>  [1504638792.8925]
> (ttyACM2): modem state changed, 'disabled' --> 'enabling' (reason:
> user preference)
> Sep 05 19:13:12 ventana NetworkManager[291]:
> <info>  [1504638792.8988]
> manager: (ttyACM2): new Broadband device
> (/org/freedesktop/NetworkManager/Devices/3)
> Sep 05 19:13:12 ventana NetworkManager[291]:
> <info>  [1504638792.9006]
> device (ttyACM2): state change: unmanaged -> unavailable (reason
> 'managed') [10 20 2]
> Sep 05 19:13:12 ventana NetworkManager[291]:
> <info>  [1504638792.9029]
> device (ttyACM2): modem state 'enabling'
> Sep 05 19:13:14 ventana NetworkManager[291]:
> <info>  [1504638794.3136]
> (ttyACM2): modem state changed, 'enabling' --> 'registered' (reason:
> user-requested)
> Sep 05 19:13:14 ventana NetworkManager[291]:
> <info>  [1504638794.3144]
> device (ttyACM2): state change: unavailable -> disconnected (reason
> 'modem-available') [20 30 58]
> ^^^^ looks like its simply still tryig to use ttyACM2
> 
> > > section but maybe I've got larger issues because nm seems to not
> > > even
> > > like ttyACM0 for the interface:
> > > 
> 
> <snip>
> > > 
> > > root at ventana:~# nmcli device status
> > > DEVICE   TYPE      STATE         CONNECTION
> > > eth0     ethernet  disconnected  --
> > > ttyACM0  gsm       unavailable   --
> > > can0     can       unmanaged     --
> > > lo       loopback  unmanaged     --
> > 
> > So NM thinks the modem is unavailable.  That's usually caused by
> > rfkill-switch-type stuff, or because the WWAN plugin hasn't been
> > built
> > for NM, or it hasn't been built with the right options.
> > 
> > Can you grab NM log output and we can see what's going on?
> > 
> > Also, 'rfkill list' and 'nmcli radio' output.
> 
> Let's chalk this up to user error - I think I may have been
> experiencing this due to having multiple modem's configured in
> /etc/NetworkManager/system-connections/ when I was playing with
> 'nmcli
> connection add type gsm' syntax.
> 
> Tim