Modem Troubleshooting

Modem Troubleshooting


Modem Troubleshooting 


Note: The commands below need to be run from the root shell.  This is accessed from the admin CLI by using: shell sudo su -

List connected modems

mmcli -L

Found 1 modems:

       /org/freedesktop/ModemManager1/Modem/0 [Sierra Wireless, Incorporated] EM7565


Note: The highlighted number indicates the current index number for the modem(s) installed.  This index number is used in several of the subsequent commands.  Replace 0 with the index number from the output as needed.

List Modem connection details

mmcli -m 0

/org/freedesktop/ModemManager1/Modem/0 (device id '51fd0aad8fb4f35a5124319dd0b1f3419423cf72')

 -------------------------  

 Hardware    |     manufacturer:   'Sierra Wireless, Incorporated'

             |     model:   'EM7565'

             |     revision:   'SWI9X50C_01.07.02.00 6c91bc jenkins 2018/06/13 23:08:16'

             |     supported:   'gsm-umts

             |     lte

             |     gsm-umts, lte'

             |     current:   ‘gsm-umts, lte'

             |     equipment id:   '359260080243113'

 -------------------------

 System      |     device:   '/sys/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1.2'

             |     drivers:   'qcserial, qmi_wwan'

             |     plugin:   'Sierra EM7565'

             |     primary port:   'cdc-wdm0'

             |     ports:   'ttyUSB0 (qcdm), cdc-wdm0 (qmi), wwan0 (net)'

 -------------------------

 Numbers     |     own :   '447432xxxxx'

 -------------------------

 Status      |     lock:   'sim-pin2'

             |     unlock retries:   'sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)'

             |     state:   'registered’/’locked’/’connected’

             |     power state:   'on'

             |     access tech:   'lte'

             |     signal quality:   '62' (recent)

 -------------------------

 Modes       |     supported:   'allowed: 2g, 3g, 4g; preferred: none'

             |     current:   'allowed: 2g, 3g, 4g; preferred: none'

 -------------------------

 Bands       |     supported:   'u2100, u1900, u17iv, u800, u850, u900, u17ix, eutran-i, eutran-ii, eutran-iii, eutran-iv, eutran-v, eutran-vii, eutran-viii, eutran-ix, eutran-xii, eutran-xiii, eutran-xviii,   eutran-xix, eutran-xx, eutran-xli'

             |     current:   'u2100, u1900, u17iv, u800, u850, u900, u17ix, eutran-i, eutran-ii, eutran-iii, eutran-iv, eutran-v, eutran-vii, eutran-viii, eutran-ix, eutran-xii, eutran-xiii, eutran-xviii,   eutran-xix, eutran-xx, eutran-xli'

 -------------------------

 IP          |     supported:   'ipv4, ipv6, ipv4v6'

 -------------------------

 3GPP   |     imei:  'xxxxxxxx'

            |     enabled locks:  'none’

  |     operator id:  '23430'

             |    operator name:   'EE'

             |    subscription:   'unknown'

             |    registration:   'home'

 -------------------------

 SIM         |    path:   '/org/freedesktop/ModemManager1/SIM/0'

 -------------------------

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



Unlock SIM

To unlock

mmcli -i 0 --pin=<PIN>


To remove PIN from SIM

mmcli -s 0 --pin=<PIN> --disable-pin


Hardware Supported (type of connection)

'2G'  - 2G technologies, e.g. EDGE, CDMA1x

'3G'  - 3G technologies, e.g. HSPA, EV-DO

'4G'  - 4G technologies, e.g. LTE

'ANY' - for all supported modes.




Bearer Information

mmcli -m 0 --list-bearers

Found 1 bearers:

       /org/freedesktop/ModemManager1/Bearer/1



Note: The blue highlighted number represents the current bearer for the modem.  Replace 1 with the bearer number from the output as needed.

mcli -b 0

Bearer '/org/freedesktop/ModemManager1/Bearer/0'

 -------------------------

 Status                  |     connected:   'no'

                             |     suspended:   'no'

                             |     interface:   'unknown'

                             |     IP timeout:   '20'

 -------------------------

 Properties            |    apn:   'broadband'

                             |    roaming:   'allowed'

                             |    IP type:   'ipv4'

                             |     user:   'none'

                             |     password:   'none'

                             |     number:   'none'

                             |     Rm protocol:   'unknown'

 -------------------------

 IPv4 configuration      |     method:   'unknown'

 -------------------------

 IPv6 configuration    |     method:   'unknown'

 -------------------------

 Stats                             |     Duration:   '1500'

                                      |     Bytes received:   '17606'

                                      |     Bytes transmitted:   '17756'


Scan Network

mmcli -m 0 --3gpp-scan --timeout=300

Found 9 networks:

23420 - 3 UK (umts, forbidden)

23415 - voda UK (lte, forbidden)

23432 - 234 32 (lte, forbidden)

23410 - O2 - UK (lte, forbidden)

23415 - voda UK (umts, forbidden)

23410 - O2 - UK (umts, forbidden)

23420 - 3 UK (lte, forbidden)

23430 - EE (umts, available)

23430 - EE (lte, current)



Start/stop modem connection


mmcli -m 0 --simple-connect="operator-id=23430, apn=broadband" --verbose

[16 Dec 2019, 13:13:13] [Debug] Forcing request to be run asynchronously

[16 Dec 2019, 13:13:13] [Debug] Assuming '0' is the modem index

[16 Dec 2019, 13:13:13] [Debug] ModemManager process found at ':1.1'

[16 Dec 2019, 13:13:13] [Debug] Modem found at '/org/freedesktop/ModemManager1/Modem/0’

[16 Dec 2019, 13:13:13] [Debug] Asynchronously connecting the modem...

successfully connected the modem


mmcli -m 0 --simple-disconnect


Status modem connection


mmcli -m 0 --simple-status    

/org/freedesktop/ModemManager1/Modem/0

 -------------------------

 Status  | state:  'connected’/’registered’

         |  signal quality:  '65' (recent)

         |           bands:  'u2100, u1900, u17iv, u800, u850, u900, u17ix, eutran-i, eutran-ii, eutran-iii, eutran-iv, eutran-v, eutran-vii, eutran-viii, eutran-ix, eutran-xii, eutran-xiii, eutran-xviii, eutran-xix, eutran-xx, eutran-xli'

         |     access tech:  'lte'

 -------------------------

 3GPP    |    registration:  'home'

         |   operator code:  '23430'

         |   operator name:  'EE'

         |   subscription:  'unknown’


Additional Info


Details of modem/SIM(s) is/are located in:

/etc/NetworkManager/system-connections/’name of LTE connection’


Signal strength

qmicli -d /dev/cdc-wdm0 --device-open-proxy --nas-get-signal-info






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