Sierra HL7692

[Sven Schwermer]

Hi,

I’m currently trying to get the Sierra HL7692 up and running. In my first attempt, I set the USB composition to AT+KUSBCOMP=2 so that I would get 1x MBIM + 3x CDC-ACM. This worked but the modem was only recognised as “generic” which didn’t allow for extended signal query, etc.

Next, I set the USB composition to AT+KUSBCOMP=0 which enumerates 4x CDC-NCM + 3x CDC-ACM. The USB enumeration works ok:

usb 1-1: new high-speed USB device number 6 using ci_hdrc
cdc_acm 1-1:1.0: ttyACM0: USB ACM device
cdc_acm 1-1:1.2: ttyACM1: USB ACM device
cdc_acm 1-1:1.4: ttyACM2: USB ACM device
cdc_ncm 1-1:1.6: MAC-Address: 00:00:11:12:13:14
cdc_ncm 1-1:1.6: setting rx_max = 16384
cdc_ncm 1-1:1.6 wwan0: register 'cdc_ncm' at usb-ci_hdrc.0-1, Mobile Broadband Network Device (NO ARP), 00:00:11:12:13:14
cdc_ncm 1-1:1.8: MAC-Address: 00:00:11:12:13:16
cdc_ncm 1-1:1.8: setting rx_max = 16384
cdc_ncm 1-1:1.8 wwan1: register 'cdc_ncm' at usb-ci_hdrc.0-1, Mobile Broadband Network Device (NO ARP), 00:00:11:12:13:16
cdc_ncm 1-1:1.10: MAC-Address: 00:00:11:12:13:18
cdc_ncm 1-1:1.10: setting rx_max = 16384
cdc_ncm 1-1:1.10 wwan2: register 'cdc_ncm' at usb-ci_hdrc.0-1, Mobile Broadband Network Device (NO ARP), 00:00:11:12:13:18
cdc_ncm 1-1:1.12: MAC-Address: 00:00:11:12:13:1a
cdc_ncm 1-1:1.12: setting rx_max = 16384
cdc_ncm 1-1:1.12 wwan3: register 'cdc_ncm' at usb-ci_hdrc.0-1, Mobile Broadband Network Device (NO ARP), 00:00:11:12:13:1a

The ModemManager also detects the modem correctly:

/org/freedesktop/ModemManager1/Modem/2 (device id '50bd7c933398deee2cfebb3b26c0bc554cf8ccdd')
  -------------------------
  Hardware |   manufacturer: 'Sierra Wireless'
           |          model: 'HL7692'
           |       revision: 'RHL769x.2.26.180400.201802141030.x7120m_1'
           |   H/W revision: 'unknown'
           |      supported: 'gsm-umts, lte'
           |        current: 'gsm-umts, lte'
           |   equipment id: ‘xxx'
  -------------------------
  System   |         device: '/sys/devices/platform/soc/30800000.aips-bus/30b10000.usb/ci_hdrc.0/usb1/1-1'
           |        drivers: 'cdc_acm, cdc_ncm'
           |         plugin: 'Generic'
           |   primary port: 'ttyACM0'
           |          ports: 'wwan3 (net), ttyACM0 (at), wwan0 (net), wwan1 (net), wwan2 (net), ttyACM2 (at)'
  -------------------------
  Numbers  |           own : 'unknown'
  -------------------------
  Status   |           lock: 'none'
           | unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)'
           |          state: 'registered'
           |    power state: 'on'
           |    access tech: 'lte'
           | 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: ‘xxx'
           |  enabled locks: 'none'
           |    operator id: 'unknown'
           |  operator name: 'unknown'
           |   subscription: 'unknown'
           |   registration: 'home'
           |    EPS UE mode: 'csps-1'
  -------------------------
  SIM      |           path: '/org/freedesktop/ModemManager1/SIM/2'

  -------------------------
  Bearers  |          paths: '/org/freedesktop/ModemManager1/Bearer/2’

I can even connect via --simple-connect. The problem is that NetworkManager always connects via pppd over the CDC-ACM port. I would have expected to establish the connection via one of the CDC-NCM ports (wwan0..4). When I create a connection like so

nmcli c add type gsm ifname wwan0 apn apn.mydomain.com

I’m getting “Error: Connection activation failed: No suitable device found for this connection.”

When no interface is specified, NetworkManager selects ttyACM0. How do I make NetworkManager select the CDC-NCM port?

I realise that this may be more related to NetworkManager but hope that I find better answers here. I’m using ModemManager 1.8.2, NetworkManager 1.12.2 and Linux 4.1.32.

Best regards,
Sven