Hello everybody,
I have a problem connecting to a UMTS network on an embedded system.
Here are the details:
- Modem Quectel UC20
- packages installed: usbutils, usb_modeswitch, NetworkManager (1.0.4), ModemManager (1.4.2).
To activate network connection, I work as follows:
// Start ModemManager with log debug
ModemManager --debug &
// Enable modem
mmcli -m 0 -e
// Start NetworkManager
NetworkManager &
// cdc-wdm0 is the primary port oc the modem, look at the following text.
nmcli c add type gsm ifname cdc-wdm0 con-name remoteConnection apn ibox.tim.it // By this command I'm able to verify that the modem is registered to the network
mmcli -m 0 -w
Output is
/org/freedesktop/ModemManager1/Modem/0: Initial state, 'registered
The output of the command
mmcli -m 0
is:
/org/freedesktop/ModemManager1/Modem/0 (device id 'fdecd6b32808f6d001a07e35d54ac8635ac19228')
-------------------------
Hardware | manufacturer: 'QUALCOMM INCORPORATED'
| model: '0'
| revision: 'UC20EQAR03A04M1024 1 [2014/05/05 9:00:00]'
| supported: 'gsm-umts'
| current: 'gsm-umts'
| equipment id: '861075021304068'
-------------------------
System | device: '/sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb2/2-1/2-1.2'
| 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: 'registered'
| power state: 'on'
| access tech: 'umts'
| signal quality: '36' (recent)
-------------------------
Modes | supported: 'allowed: 2g; preferred: none
| allowed: 3g; preferred: none
| allowed: 2g, 3g; preferred: none
| allowed: 2g, 3g; preferred: 2g
| allowed: 2g, 3g; preferred: 3g'
| current: 'allowed: 2g, 3g; preferred: none'
-------------------------
Bands | supported: 'cdma-bc15-aws, dcs, egsm, pcs, g850, u2100, u900'
| current: 'cdma-bc15-aws, dcs, egsm, pcs, g850, u2100, u900'
-------------------------
IP | supported: 'ipv4, ipv6, ipv4v6'
-------------------------
3GPP | imei: '861075021304068'
| enabled locks: 'none'
| operator id: '22201'
| operator name: 'TIM'
| subscription: 'unknown'
| registration: 'home'
-------------------------
SIM | path: '/org/freedesktop/ModemManager1/SIM/0'
-------------------------
Bearers | paths: 'none'
So, once again, it seems the modem is registered.
However the output of the command
nmcli con
is as follows:
NAME UUID TYPE DEVICE
remoteConnection 3c1a500d-fc67-4523-9ba9-6973249a859a gsm --
So it seems that the remoteConnection is not associated with any device (I think that the device should be cdc-wdm0).
Error: Connection activation failed: No suitable device found for this connection
I'm working on an embedded device without gui, and the SW version are the following ones:
I'm not able to upgrade those applications.
