Unable to setup QMI on Telit LE910C4-EU

Cellular Modules Telit LE910C1/C4 LTE Module
1

Hello!

I’ve been trying to configure the Telit LE910C4 EU module on my Raspberry Pi 3b+ according to: Setting up a data connection over QMI interface using libqmi

When I check for AT#USBCFG? I receive the value equal to 4. I try to change it using AT#USBCFG=0 and reboot but is not working.

Also when I use lsusb -t I get this output:
raspberrypi:~ $ lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
|__ Port 3: Dev 4, If 0, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 3: Dev 4, If 1, Class=Vendor Specific Class, Driver=, 480M
|__ Port 3: Dev 4, If 2, Class=Communications, Driver=cdc_ether, 480M
|__ Port 3: Dev 4, If 3, Class=CDC Data, Driver=cdc_ether, 480M
|__ Port 3: Dev 4, If 4, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 3: Dev 4, If 5, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 3: Dev 4, If 6, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 3: Dev 4, If 7, Class=Vendor Specific Class, Driver=option, 480M

I cannot see anywhere the driver qmi_wwan.

Also when I type: dmesg | grep ttyUSB this is the output
[ 10.271476] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0
[ 10.272666] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1
[ 10.273368] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2
[ 10.274275] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3
[ 10.274880] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB4
[ 96.467773] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 96.560359] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 96.561052] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 96.561721] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 96.562367] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 108.944172] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0
[ 108.954446] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1
[ 108.955591] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2
[ 108.956592] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3
[ 108.957624] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB4
[ 220.373542] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 220.424499] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 220.425254] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 220.426283] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 220.428431] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 229.773636] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0
[ 229.784768] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1
[ 229.785822] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2
[ 229.786908] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3
[ 229.788052] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB4

I am using a Vodafone RO sim card and I am also sharing the AT COMMANDS OUPUT

Welcome to minicom 2.8

OPTIONS: I18n
Port /dev/ttyUSB3, 09:25:44

Press CTRL-A Z for help on special keys

AT
OK
AT+COPS?
+COPS: 0,0,“Vodafone RO”,2

OK
AT+CREG?
+CREG: 0,1

OK
AT+CSQ?
ERROR
AT+CSQ
+CSQ: 20,2

OK

Thank you in advance

2

Hi,

Can you share the AT#USBCFG=0 command output?
To see the result code of the error, enable the verbose error reporting with AT+CMEE=2 , then try to run the AT commands you get the error.

3

Hi @ensar,

The commands AT#USBCFG=0 and AT+CMEE=2 return OK, but when I check AT#USBCFG? it says USBCFG=4.

Also I cannot see the driver qmi_wwan anywhere. I have cdc_ether.

I also tried to establish an ECM connection but after I setup the APN “+CGDCONT: 1,“IPV4V6”, “live.vodafone.com”,0,0,0,0” which is OK, i get error when I run the command AT#ECM=1,0 I get an ERROR. And if I check again the APN I get the default value of “+CGDCONT: 1,“IPV4V6”, “de1.super”,0,0,0,0”

4

Similar to the issue in the thread here, this issue seems to be related to having CORE installed. You need to uninstall it to avoid conflicts.