On Fri, Sep 1, 2017 at 1:22 PM, Dan Williams <d...@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'
section but maybe I've got larger issues because nm seems to not even
like ttyACM0 for the interface:
root@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: 'ttyACM0'
| ports: 'wwx000011121314 (net), ttyACM0 (at),
wwx000011121316 (net), wwx00001112131a (net), wwx000011121318 (net),
ttyACM2 (at)'
-------------------------
Numbers | own : '+19529136397'
-------------------------
Status | lock: 'none'
| unlock retries: 'unknown'
| state: 'enabled'
| power state: 'on'
| access tech: 'unknown'
| signal quality: '0' (cached)
-------------------------
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: 'unknown'
| operator name: 'unknown'
| subscription: 'unknown'
| registration: 'idle'
-------------------------
SIM | path: '/org/freedesktop/ModemManager1/SIM/0'
-------------------------
Bearers | paths: 'none'
root@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=1504629466.392532 sender=:1.3 -> destination=:1.25
serial=31 reply_serial=2
variant string "6909b49a4d44867387a2b09b8095c579e031874c"
root@ventana:~# nmcli --version
nmcli tool, version 1.2.6
root@ventana:~# nmcli device status
DEVICE TYPE STATE CONNECTION
eth0 ethernet disconnected --
ttyACM0 gsm unavailable --
can0 can unmanaged --
lo loopback unmanaged --
root@ventana:~# nmcli connection add type gsm ifname ttyACM0 con-name
mymodem apn vzwinternet
Connection 'mymodem' (ce87bf21-f700-4c61-8165-dda4b6c44ea8) successfully added.
nmcli connection add type gsm ifname ttyACM0 con-name mymodem apn vzwinternet
root@ventana:~# nmcli connection up mymodem
Error: Connection activation failed: No suitable device found for this
connection.
^^^^^^ not sure why ttyACM0 isn't acceptable here
Thanks,
Tim
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