EG800K NEtworkManager does not detect USB Modem

Julio.Cerveza · August 3, 2026, 6:41pm

Hello,

wanted to know if anyone encountered any limitations in respect to EG800K-EU Modem and Raspberry 5 “Raspbian GNU/Linux 13 (trixie)”.

I cant register my usb interface, my LTE Modem is connected through usb, within NetworkManager…

I can ping an ip directly, but as not registered within nm I am missing DNS as well…

My firmware version is: EG800KEULCR07A07M04

Cheers

jfrog · August 3, 2026, 7:55pm

Show the output of cat /sys/kernel/debug/usb/devices

Julio.Cerveza · August 4, 2026, 6:44pm

ok, here some more infos,

user@chupi:~ $ mmcli -L

    /org/freedesktop/ModemManager1/Modem/1 [Quectel] EG800K



user@chupi:~ $ systemctl status NetworkManager

● NetworkManager.service - Network Manager

     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; preset: enabled)

     Active: active (running) since Mon 2026-08-03 21:40:36 CEST; 7min ago

 Invocation: b3713c24358845bdba251a6fc4323b8b

       Docs: man:NetworkManager(8)

   Main PID: 921 (NetworkManager)

      Tasks: 4 (limit: 4915)

        CPU: 527ms

     CGroup: /system.slice/NetworkManager.service

             └─921 /usr/sbin/NetworkManager --no-daemon


Aug 03 21:42:26 chupi NetworkManager[921]: <info>  [1785786146.9431] manager: NetworkManager state is now CONNECTED_GLOBAL

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6346] device (usb0): state change: activated -> unmanaged (reason 'unmanaged-link-not-init', managed-typ>

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6735] dhcp4 (usb0): canceled DHCP transaction

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6736] dhcp4 (usb0): activation: beginning transaction (timeout in 45 seconds)

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6736] dhcp4 (usb0): state changed no lease

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6741] manager: NetworkManager state is now DISCONNECTED

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6890] manager: (ttyUSB2): new Broadband device (/org/freedesktop/NetworkManager/Devices/7)

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6893] device (ttyUSB2): state change: unmanaged -> unavailable (reason 'managed', managed-type: 'externa>

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.6896] device (ttyUSB2): modem state 'enabling'

Aug 03 21:42:31 chupi NetworkManager[921]: <info>  [1785786151.7458] device (ttyUSB2): state change: unavailable -> disconnected (reason 'none', managed-type: 'full')

lines 1-21/21 (END)




user@chupi:~ $ cat /sys/kernel/debug/usb/devices 


T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 2

B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0

D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1

P:  Vendor=1d6b ProdID=0002 Rev= 6.12

S:  Manufacturer=Linux 6.12.47+rpt-rpi-v8 xhci-hcd

S:  Product=xHCI Host Controller

S:  SerialNumber=xhci-hcd.0

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=01 Cnt=01 Dev#=  2 Spd=12   MxCh= 0

D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=32 #Cfgs=  1

P:  Vendor=413c ProdID=2514 Rev= 2.22

S:  Manufacturer=Dell Computer Corp

S:  Product=Dell Universal Receiver

C:* #Ifs= 3 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=4ms

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

I:* If#= 2 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid

E:  Ad=83(I) Atr=03(Int.) MxPS=  32 Ivl=2ms


T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=5000 MxCh= 1

B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0

D:  Ver= 3.00 Cls=09(hub  ) Sub=00 Prot=03 MxPS= 9 #Cfgs=  1

P:  Vendor=1d6b ProdID=0003 Rev= 6.12

S:  Manufacturer=Linux 6.12.47+rpt-rpi-v8 xhci-hcd

S:  Product=xHCI Host Controller

S:  SerialNumber=xhci-hcd.0

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=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 2

B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0

D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1

P:  Vendor=1d6b ProdID=0002 Rev= 6.12

S:  Manufacturer=Linux 6.12.47+rpt-rpi-v8 xhci-hcd

S:  Product=xHCI Host Controller

S:  SerialNumber=xhci-hcd.1

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=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  5 Spd=480  MxCh= 0

D:  Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  1

P:  Vendor=2c7c ProdID=6002 Rev= 3.18

S:  Manufacturer=Quectel

S:  Product=EG800K-EU

S:  SerialNumber=0000

C:* #Ifs= 5 Cfg#= 1 Atr=e0 MxPwr=500mA

A:  FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=06 Prot=00

I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=cdc_ether

E:  Ad=87(I) Atr=03(Int.) MxPS=  64 Ivl=4096ms

I:  If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether

I:* If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether

E:  Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

E:  Ad=0c(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option

E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

E:  Ad=0b(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option

E:  Ad=89(I) Atr=03(Int.) MxPS=  64 Ivl=4096ms

E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

E:  Ad=0f(O) 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=88(I) Atr=03(Int.) MxPS=  64 Ivl=4096ms

E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

E:  Ad=0a(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms


T:  Bus=04 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=5000 MxCh= 1

B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0

D:  Ver= 3.00 Cls=09(hub  ) Sub=00 Prot=03 MxPS= 9 #Cfgs=  1

P:  Vendor=1d6b ProdID=0003 Rev= 6.12

S:  Manufacturer=Linux 6.12.47+rpt-rpi-v8 xhci-hcd

S:  Product=xHCI Host Controller

S:  SerialNumber=xhci-hcd.1

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

jfrog · August 4, 2026, 7:00pm

Get rid of ModemManager completely and setup a regular DHCP interface.

Julio.Cerveza · August 5, 2026, 5:41pm

are you talking about sudo dhclient usb0 ? (usb0 is my LTE interface)

jfrog · August 5, 2026, 5:49pm

Please refer to your Linux distro documentation.

Julio.Cerveza · August 5, 2026, 6:33pm

ok, what I did,

Open the terminal via SSH or direct desktop access.
Type sudo nmtui to launch the NetworkManager text interface.
Select Edit a connection.
Choose your interface USB-LTE
Go to IPv4 CONFIGURATION, change it from Manual to Automatic → was already automatic
Clear out any manual entries → no entries were present
Restart Pi

unfortunatelly I still have issue with the connection, I am loosing ping after short time and I am not able to retrigger ping again… ModemManager is offline.

AT+QCFG="usbnet"
+QCFG: "usbnet",1

AT+QNETDEVCTL?
+QNETDEVCTL: 3,1,1,1

AT+QNETDEVCTL=3,1
OK

AT+QNETDEVCTL?
+QNETDEVCTL: 3,1,0,1


user@chupi:~ $ systemctl status NetworkManager
● NetworkManager.service - Network Manager
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; preset: enabled)
     Active: active (running) since Wed 2026-08-05 20:09:37 CEST; 6min ago
 Invocation: b3195f7be93546eaa5d200014e5a9b9d
       Docs: man:NetworkManager(8)
   Main PID: 954 (NetworkManager)
      Tasks: 4 (limit: 4915)
        CPU: 490ms
     CGroup: /system.slice/NetworkManager.service
             └─954 /usr/sbin/NetworkManager --no-daemon

Aug 05 20:09:41 chupi NetworkManager[954]: <info>  [1785953381.8348] dhcp6 (wlan0): state changed new lease, address=2a02:8070:2482:81c0::9df5
Aug 05 20:09:42 chupi NetworkManager[954]: <info>  [1785953382.4349] device (usb0): carrier: link connected
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.0721] dhcp4 (usb0): state changed new lease, address=192.168.43.100, acd pending
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.2397] dhcp4 (usb0): state changed new lease, address=192.168.43.100
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.2406] policy: set 'LTE-USB' (usb0) as default for IPv4 routing and DNS
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.2622] device (usb0): state change: ip-config -> ip-check (reason 'none', managed-type: 'full')
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3006] device (usb0): state change: ip-check -> secondaries (reason 'none', managed-type: 'full')
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3012] device (usb0): state change: secondaries -> activated (reason 'none', managed-type: 'full')
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3017] device (usb0): Activation: successful, device activated.
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3021] manager: startup complete
user@chupi:~ $ ip route
default via 192.168.43.1 dev usb0 proto dhcp src 192.168.43.100 metric 100 
default via 192.168.0.1 dev wlan0 proto static metric 600 
192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.245 metric 600 
192.168.43.0/24 dev usb0 proto kernel scope link src 192.168.43.100 metric 100 
user@chupi:~ $ ip route
default via 192.168.43.1 dev usb0 proto dhcp src 192.168.43.100 metric 100 
default via 192.168.0.1 dev wlan0 proto static metric 600 
192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.245 metric 600 
192.168.43.0/24 dev usb0 proto kernel scope link src 192.168.43.100 metric 100 
user@chupi:~ $ systemctl status NetworkManager
● NetworkManager.service - Network Manager
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; preset: enabled)
     Active: active (running) since Wed 2026-08-05 20:09:37 CEST; 7min ago
 Invocation: b3195f7be93546eaa5d200014e5a9b9d
       Docs: man:NetworkManager(8)
   Main PID: 954 (NetworkManager)
      Tasks: 4 (limit: 4915)
        CPU: 507ms
     CGroup: /system.slice/NetworkManager.service
             └─954 /usr/sbin/NetworkManager --no-daemon

Aug 05 20:09:41 chupi NetworkManager[954]: <info>  [1785953381.8348] dhcp6 (wlan0): state changed new lease, address=2a02:8070:2482:81c0::9df5
Aug 05 20:09:42 chupi NetworkManager[954]: <info>  [1785953382.4349] device (usb0): carrier: link connected
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.0721] dhcp4 (usb0): state changed new lease, address=192.168.43.100, acd pending
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.2397] dhcp4 (usb0): state changed new lease, address=192.168.43.100
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.2406] policy: set 'LTE-USB' (usb0) as default for IPv4 routing and DNS
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.2622] device (usb0): state change: ip-config -> ip-check (reason 'none', managed-type: 'full')
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3006] device (usb0): state change: ip-check -> secondaries (reason 'none', managed-type: 'full')
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3012] device (usb0): state change: secondaries -> activated (reason 'none', managed-type: 'full')
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3017] device (usb0): Activation: successful, device activated.
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3021] manager: startup complete
user@chupi:~ $ systemctl status NetworkManager
● NetworkManager.service - Network Manager
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; preset: enabled)
     Active: active (running) since Wed 2026-08-05 20:09:37 CEST; 9min ago
 Invocation: b3195f7be93546eaa5d200014e5a9b9d
       Docs: man:NetworkManager(8)
   Main PID: 954 (NetworkManager)
      Tasks: 4 (limit: 4915)
        CPU: 548ms
     CGroup: /system.slice/NetworkManager.service
             └─954 /usr/sbin/NetworkManager --no-daemon

Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3017] device (usb0): Activation: successful, device activated.
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3021] manager: startup complete
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.4351] device (wlan0): state change: activated -> deactivating (reason 'user-requested', managed-type: 'full')
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.4370] audit: op="device-disconnect" interface="wlan0" ifindex=4 pid=1327 uid=1000 result="success"
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5025] device (wlan0): supplicant interface state: completed -> disconnected
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5026] device (p2p-dev-wlan0): supplicant management interface state: completed -> disconnected
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5028] device (wlan0): state change: deactivating -> disconnected (reason 'user-requested', managed-type: 'full')
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5030] dhcp6 (wlan0): canceled DHCP transaction
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5030] dhcp6 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5030] dhcp6 (wlan0): state changed no lease
user@chupi:~ $ systemctl status NetworkManager
● NetworkManager.service - Network Manager
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; preset: enabled)
     Active: active (running) since Wed 2026-08-05 20:09:37 CEST; 10min ago
 Invocation: b3195f7be93546eaa5d200014e5a9b9d
       Docs: man:NetworkManager(8)
   Main PID: 954 (NetworkManager)
      Tasks: 4 (limit: 4915)
        CPU: 553ms
     CGroup: /system.slice/NetworkManager.service
             └─954 /usr/sbin/NetworkManager --no-daemon

Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3017] device (usb0): Activation: successful, device activated.
Aug 05 20:09:46 chupi NetworkManager[954]: <info>  [1785953386.3021] manager: startup complete
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.4351] device (wlan0): state change: activated -> deactivating (reason 'user-requested', managed-type: 'full')
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.4370] audit: op="device-disconnect" interface="wlan0" ifindex=4 pid=1327 uid=1000 result="success"
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5025] device (wlan0): supplicant interface state: completed -> disconnected
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5026] device (p2p-dev-wlan0): supplicant management interface state: completed -> disconnected
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5028] device (wlan0): state change: deactivating -> disconnected (reason 'user-requested', managed-type: 'full')
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5030] dhcp6 (wlan0): canceled DHCP transaction
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5030] dhcp6 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Aug 05 20:18:01 chupi NetworkManager[954]: <info>  [1785953881.5030] dhcp6 (wlan0): state changed no lease
user@chupi:~ $ system status ModemManager
bash: system: command not found
user@chupi:~ $ systemctl status ModemManager
○ ModemManager.service - Modem Manager
     Loaded: loaded (/usr/lib/systemd/system/ModemManager.service; disabled; preset: enabled)
     Active: inactive (dead)
user@chupi:~ $

Julio.Cerveza · August 6, 2026, 6:56am

is it possible to record some logs from EG800 ?

as when my inet is getting lost, I cant even type any AT commands towards modem, no reaction, except the exit command CTRL A/X which seemst to work…