issue with Quectel EC20

[Piotr Figiel]

Hi,
 I'm trying to get Quectel EC20 working with ModemManager without success.
 I have kernel with compiled in option and qmi_wwan drivers, with
patches suggested in Quectel documentation.

 I was able to get it working with qmi-network tool, although
ModemManager 1.16.10 (+libqmi 1.16.0) struggles:

# mmcli -m 0 --simple-connect="apn=internet,user=internet,password=internet"
error: couldn't connect the modem: 'Timeout was reached'

I observe similar behavior when using NetworkManager to setup the connection.

In ModemManager log I see after following lines there are no more logs from MM:

<INFO>  <info>  Simple connect started...
<INFO>  <info>  Simple connect state (3/8): Enable
<INFO>  <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state
changed (disabled -> enabling)
<WARNING>  <warn>  (ttyUSB2): port attributes not fully set
<WARNING>  <warn>  (ttyUSB3): port attributes not fully set
<INFO>  <info>  Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP
Registration state changed (unknown -> registering)
<INFO>  <info>  Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP
Registration state changed (registering -> home)
<INFO>  <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state
changed (enabling -> registered)
<INFO>  <info>  Simple connect state (4/8): Wait to get fully enabled
<INFO>  <info>  Simple connect state (5/8): Register
<INFO>  <info>  Simple connect state (6/8): Bearer
<INFO>  <info>  Simple connect state (7/8): Connect
<INFO>  <info>  Modem /org/freedesktop/ModemManager1/Modem/0: state
changed (registered -> connecting)
<DEBUG>  [/dev/cdc-wdm0] Allocating new client ID...
<DEBUG>  [/dev/cdc-wdm0] Registered 'wds' (version 1.36) client with ID '7'

mmcli -m 0 reports the modem details normally:

  -------------------------
  Hardware |   manufacturer: 'Quectel'
           |          model: 'EC20'
           |       revision: 'EC20EQAR02A11E2G  1  [Jan 13 2017 14:26:29]'
(...)
           |        drivers: 'option1, qmi_wwan'
           |         plugin: 'Generic'
           |   primary port: 'cdc-wdm0'
           |          ports: 'ttyUSB0 (qcdm), ttyUSB2 (at), cdc-wdm0
(qmi), wwan0 (net), ttyUSB3 (at)'
  -------------------------
  Numbers  |           own : 'unknown'
  -------------------------
  Status   |           lock: 'sim-pin2'
           | unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10),
sim-puk2 (10)'
           |          state: 'connecting'
           |    power state: 'on'
           |    access tech: 'lte'
           | signal quality: '100' (recent)
  -------------------------
  Modes    |      supported: 'allowed: 2g, 3g, 4g; preferred: none'
           |        current: 'allowed: 2g, 3g, 4g; preferred: none'
  -------------------------
  Bands    |      supported: 'dcs, egsm, pcs, g850, u2100, u850, u900,
eutran-i, eutran-iii, eutran-v, eutran-vii, eutran-viii, eutran-xx'
           |        current: 'dcs, egsm, pcs, g850, u2100, u850, u900,
eutran-i, eutran-iii, eutran-v, eutran-vii, eutran-viii, eutran-xx'
  -------------------------
  IP       |      supported: 'ipv4, ipv6, ipv4v6'
  -------------------------
  3GPP     |           imei: 'XXXXX'
           |  enabled locks: 'none'
           |    operator id: 'XXXXX'
           |  operator name: 'unknown'
           |   subscription: 'unknown'
           |   registration: 'home'
  -------------------------
  SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'

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

I tried also with option driver disabled in kernel (qmi only) but the
results are very similar.
Is there something I'm missing?

Best regards,
Piotr.