MC7455 working with PPP

[Jan Haegeman]

Hi all,

After some trial and error, I managed to get the Sierra Wireless MC7455
modem online on Debian, kernel version 4.5.0.1.

ModemManager version is 1.4.14-1.
PPP version is 2.4.6-3.1.
NetworkManager version is 0.9.10.0-7.

The modem is however connecting via PPP and not via "Direct IP". The PPP
connection method is fine and performance is ok, but it does seem to
indicate that I cannot use the available AT port anymore of the modem, as
it is used for the PPP connection. I need that AT port however to retrieve
diagnostic information while the modem is active.


:~$ mmcli -m 0
/org/freedesktop/ModemManager1/Modem/0 (device id
'6bc66cd4a225213e732d55be6fcd188c0b09a711')
  -------------------------
  Hardware |   manufacturer: 'Sierra Wireless, Incorporated'
           |          model: 'MC7455'
           |       revision: 'SWI9X30C_02.04.07.00 r4823 CARMD-EV-FRMWR2
2015/11/04 06:51:37'
           |      supported: 'gsm-umts, lte'
           |        current: 'gsm-umts, lte'
           |   equipment id: 'XXXXXXXXXXXX'
  -------------------------
  System   |         device:
'/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1'
           |        drivers: 'qmi_wwan, qcserial'
           |         plugin: 'Gobi'
           |   primary port: 'ttyUSB5'
           |          ports: 'ttyUSB3 (qcdm), ce0p0 (net), ce0p1 (net),
ttyUSB5 (at)'
  -------------------------
  Numbers  |           own : 'unknown'
  -------------------------
  Status   |           lock: 'none'
           | unlock retries: 'unknown'
           |          state: 'connected'
           |    power state: 'on'
           |    access tech: 'lte'
           | signal quality: '0' (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: 'XXXXXXXXXXX'
           |  enabled locks: 'none'
           |    operator id: 'XXXXX'
           |  operator name: 'XXXX'
           |   subscription: 'unknown'
           |   registration: 'home'
  -------------------------
  SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'

  -------------------------
  Bearers  |          paths: '/org/freedesktop/ModemManager1/Bearer/0'



:~$ mmcli -b 0
Bearer '/org/freedesktop/ModemManager1/Bearer/0'
  -------------------------
  Status             |   connected: 'yes'
                     |   suspended: 'no'
                     |   interface: 'ttyUSB5'
                     |  IP timeout: '20'
  -------------------------
  Properties         |         apn: 'XXXXXX'
                     |     roaming: 'allowed'
                     |     IP type: 'none'
                     |        user: 'none'
                     |    password: 'none'
                     |      number: '*99#'
                     | Rm protocol: 'unknown'
  -------------------------
  IPv4 configuration |   method: 'ppp'
                     |  address: 'unknown'
                     |   prefix: '0'
                     |  gateway: 'unknown'
                     |      DNS: none
  -------------------------
  IPv6 configuration |   method: 'unknown'


:~$ mmcli -m 0 --command='AT!GSTATUS?'
error: command failed:
'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Connected: No AT port
available to run command'


Would I need to get the latest build of ModemManager and will it then
connect via "Direct IP" or am I missing some other configuration to make it
work via PPP?

Kind regards,
Jan
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