Yesterday I got a new Base HAT up with a Telit modem. Biggest issue was that I had to use dhclient -v wwan0 to get wwan0 added and visible. Connect.sixfab.com show the unit was up and operable. End of day came so I shut things down. Today I came in, turned things on and wwan0 is nowhere to be found. minicom sees the modem just fine but ip addr doesn’t show it, nor does ifconfig. dhclient -v wwan0 returns wwan0 not found. Multiple reboots get same results. Any suggestion on how to resolve this are welcome!
Here’s info based on the template.
Problem Description:
Yesterday I got a new Base HAT up with a Telit modem. Biggest issue was that I had to use dhclient -v wwan0 to get wwan0 added and visible. Connect.sixfab.com show the unit was up and operable. End of day came so I shut things down. Today I came in, turned things on and wwan0 is nowhere to be found. minicom sees the modem just fine but ip addr doesn’t show it, nor does ifconfig. dhclient -v wwan0 returns wwan0 not found. Multiple reboots get same results. Any suggestion on how to resolve this are welcome!
Use Case Scenario:
I’m developing a system which includes an underwater power generator, charge controller/inverter, and cloud based server for data and as a portal for smartphone control. I’m using Eth0 to connect to the underwater unit, wlan0 to connect to the controller/inverter, and wwan0 to connect to the cloud, all on an RPI 3B+.
Environment:
RPI 3B+ with RPI OS, HAT is SixFab 3G/4G/LTE using Telit LE910C4-NF with Sixfab supplied antennae and sim. SIM ID is 8988307000002659XXXX.
Connection Type: ECM
Script:
Here’s a template of the software approach:
import socket
import ctypes
import struct
Constant for SO_BINDTODEVICE
SO_BINDTODEVICE = 25 # On Linux
def connect_via_interface(interface: str, target_ip: str, port: int):
“”“Connect to a target IP using a specific network interface”“”
print(f"Connecting to {target_ip}:{port} via {interface}")
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# Bind the socket to the specific interface (requires root)
s.setsockopt(socket.SOL_SOCKET, SO_BINDTODEVICE, interface.encode() + b'\0')
try:
s.connect((target_ip, port))
print(f"Connected to {target_ip} via {interface}")
# You can send/recv here
s.send(b"GET / HTTP/1.0\r\nHost: " + target_ip.encode() + b"\r\n\r\n")
print(s.recv(1024))
except Exception as e:
print(f"Connection failed: {e}")
finally:
s.close()
Route specific targets via specific interfaces
connect_via_interface(“wlan0”, “10.0.0.5”, 80) # Local device on wlan0
connect_via_interface(“wwan0”, “1.1.1.1”, 80) # Public IP via cellular
connect_via_interface(“eth0”, “192.168.50.6”, 80) # Local device on ethernet
Linux Command Outputs:
pi@raspberrypi:~ $ cat /etc/os-release
PRETTY_NAME=“Debian GNU/Linux 12 (bookworm)”
NAME=“Debian GNU/Linux”
VERSION_ID=“12”
VERSION=“12 (bookworm)”
VERSION_CODENAME=bookworm
ID=debian
HOME_URL=“https://www.debian.org/”
SUPPORT_URL=“Debian -- User Support”
BUG_REPORT_URL=“https://bugs.debian.org/”
Linux raspberrypi 6.12.25+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.12.25-1+rpt1 (2025-04-30) aarch64 GNU/Linux
pi@raspberrypi:~ $ lsusb
Bus 001 Device 006: ID 3554:fc03 CX 2.4G Receiver
Bus 001 Device 004: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
Bus 001 Device 005: ID 1bc7:1206 Telit Wireless Solutions LE910C4-NF
Bus 001 Device 007: ID 0424:7800 Microchip Technology, Inc. (formerly SMSC)
Bus 001 Device 003: ID 0424:2514 Microchip Technology, Inc. (formerly SMSC) USB 2.0 Hub
Bus 001 Device 002: ID 0424:2514 Microchip Technology, Inc. (formerly SMSC) USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@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/4p, 480M
|__ Port 1: Dev 3, If 0, Class=Hub, Driver=hub/3p, 480M
|__ Port 2: Dev 5, If 4, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 2: Dev 5, If 2, Class=Communications, Driver=cdc_ether, 480M
|__ Port 2: Dev 5, If 0, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 2: Dev 5, If 7, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 2: Dev 5, If 5, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 2: Dev 5, If 3, Class=CDC Data, Driver=cdc_ether, 480M
|__ Port 2: Dev 5, If 1, Class=Vendor Specific Class, Driver=, 480M
|__ Port 2: Dev 5, If 6, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 7, If 0, Class=Vendor Specific Class, Driver=lan78xx, 480M
|__ Port 2: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 3: Dev 6, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 3: Dev 6, If 1, Class=Human Interface Device, Driver=usbhid, 12M
pi@raspberrypi:~ $ usb-devices
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev=06.12
S: Manufacturer=Linux 6.12.25+rpt-rpi-v8 dwc_otg_hcd
S: Product=DWC OTG Controller
S: SerialNumber=3f980000.usb
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 4
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=02 MxPS=64 #Cfgs= 1
P: Vendor=0424 ProdID=2514 Rev=0b.b3
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=2mA
I: If#= 0 Alt= 1 #EPs= 1 Cls=09(hub ) Sub=00 Prot=02 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=256ms
T: Bus=01 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 3 Spd=480 MxCh= 3
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=02 MxPS=64 #Cfgs= 1
P: Vendor=0424 ProdID=2514 Rev=0b.b3
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=2mA
I: If#= 0 Alt= 1 #EPs= 1 Cls=09(hub ) Sub=00 Prot=02 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=256ms
T: Bus=01 Lev=03 Prnt=03 Port=00 Cnt=01 Dev#= 7 Spd=480 MxCh= 0
D: Ver= 2.10 Cls=ff(vend.) Sub=00 Prot=ff MxPS=64 #Cfgs= 1
P: Vendor=0424 ProdID=7800 Rev=03.00
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=2mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=ff Driver=lan78xx
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=83(I) Atr=03(Int.) MxPS= 16 Ivl=1ms
T: Bus=01 Lev=03 Prnt=07 Port=01 Cnt=01 Dev#= 5 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1bc7 ProdID=1206 Rev=03.18
S: Manufacturer=Android
S: Product=LE910C4-NF
S: SerialNumber=0123456789ABCDEF
C: #Ifs= 8 Cfg#= 1 Atr=a0 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I: If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I: If#= 2 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=cdc_ether
E: Ad=84(I) Atr=03(Int.) MxPS= 16 Ivl=32ms
I: If#= 3 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I: If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=86(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
I: If#= 5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=87(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=88(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
I: If#= 6 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=89(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=8a(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
I: If#= 7 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=07(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=8b(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=8c(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
T: Bus=01 Lev=02 Prnt=05 Port=01 Cnt=01 Dev#= 4 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=090c ProdID=1000 Rev=11.00
S: Manufacturer=USB
S: Product=USB Flash Disk
S: SerialNumber=FBL1606140200292
C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=300mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=31875us
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
T: Bus=01 Lev=02 Prnt=04 Port=02 Cnt=01 Dev#= 6 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=3554 ProdID=fc03 Rev=07.90
S: Manufacturer=CX
S: Product=2.4G Receiver
C: #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbhid
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=2ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid
E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl=2ms
pi@raspberrypi:~ $ dmesg |grep tty
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_headphones=0 cgroup_disable=memory snd_bcm2835.enable_headphones=1 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_hdmi=0 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 console=tty1 root=PARTUUID=0d003022-02 rootfstype=ext4 fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles cfg80211.ieee80211_regdom=US
[ 0.000415] printk: legacy console [tty1] enabled
[ 3.074689] 3f201000.serial: ttyAMA1 at MMIO 0x3f201000 (irq = 99, base_baud = 0) is a PL011 rev2
[ 3.074853] serial serial0: tty port ttyAMA1 registered
[ 6.039860] systemd[1]: Created slice system-getty.slice - Slice /system/getty.
[ 8.659978] usb 1-1.1.2: GSM modem (1-port) converter now attached to ttyUSB0
[ 8.665774] usb 1-1.1.2: GSM modem (1-port) converter now attached to ttyUSB1
[ 8.667058] usb 1-1.1.2: GSM modem (1-port) converter now attached to ttyUSB2
[ 8.668018] usb 1-1.1.2: GSM modem (1-port) converter now attached to ttyUSB3
[ 8.669470] usb 1-1.1.2: GSM modem (1-port) converter now attached to ttyUSB4
pi@raspberrypi:~ $ ls -l /sys/bus/usb-serial/devices
total 0
lrwxrwxrwx 1 root root 0 May 22 17:08 ttyUSB0 → …/…/…/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.0/ttyUSB0
lrwxrwxrwx 1 root root 0 May 22 17:08 ttyUSB1 → …/…/…/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.4/ttyUSB1
lrwxrwxrwx 1 root root 0 May 22 17:08 ttyUSB2 → …/…/…/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.5/ttyUSB2
lrwxrwxrwx 1 root root 0 May 22 17:08 ttyUSB3 → …/…/…/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.6/ttyUSB3
lrwxrwxrwx 1 root root 0 May 22 17:08 ttyUSB4 → …/…/…/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2:1.7/ttyUSB4
pi@raspberrypi:~ $ ls -l /dev/serial/by-id
total 0
lrwxrwxrwx 1 root root 13 May 22 15:13 usb-Android_LE910C4-NF_0123456789ABCDEF-if00-port0 → …/…/ttyUSB0
lrwxrwxrwx 1 root root 13 May 22 15:13 usb-Android_LE910C4-NF_0123456789ABCDEF-if04-port0 → …/…/ttyUSB1
lrwxrwxrwx 1 root root 13 May 22 15:13 usb-Android_LE910C4-NF_0123456789ABCDEF-if05-port0 → …/…/ttyUSB2
lrwxrwxrwx 1 root root 13 May 22 15:13 usb-Android_LE910C4-NF_0123456789ABCDEF-if06-port0 → …/…/ttyUSB3
lrwxrwxrwx 1 root root 13 May 22 15:13 usb-Android_LE910C4-NF_0123456789ABCDEF-if07-port0 → …/…/ttyUSB4
AT Responses:
Telit Modules
AT OK
ATI 332, OK
AT+CGMR M0F.660012, OK
AT+CPIN? +CPIN: READY
AT+CPAS +CPAS: 0, OK
AT+CFUN? +CFUN: 1, OK
AT+COPS? +COPS: 0,0,”T-Mobile”,7, OK
AT#USBCFG? #USBCFG: 4, OK
AT#BND? #BND: ,10,80800000000381A, OK
AT+CREG? +CREG: 0,5, OK
AT+CGDCONT?
-CGDCONT: 1,”IPV4V6”,”super”,””,0,0,0,0
-CGDCONT: 2,”IPV4V6”,”ims”,””,0,0,0,0
-CGDCONT: 3,”IPV4V6”,”sos”,””,0,0,0,0
-CGDCONT: 4,”IPV4V6”,”attm2mglobal”,””,0,0,0,0
OK
AT+CSQ -CSQ: 20,4 , OK
AT+CGATT? -CGATT: 1 , OK
AT+GMMnLE910-NF
AT#SWPKGV
25.21.662-P0F.662900
M0F.660012
P0F.662900
A0F.66012
OK
AT#FWSWITCH? FWSWITCH: 0,0,0 ,OK
AT+CGREG? -CGREG: 0,5 ,OK
AT#CGPADDR=
#CGPADDR: 1,”100.74.196.78”
#CGPADDR: 2,””
#CGPADDR: 3,””
#CGPADDR: 4,””
OK
Any suggestions as to how to get wwan0 back up are most appreciated!!