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Questions tagged [modem]

This tag is for questions about a network interface for analog lines such as “56k” or DSL on phone lines, as well as for mobile network data service clients.

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USB device not recognized on Debian and missing /dev/ttyUSB

I am quite new to Linux. I have two BeagleBone Black PCs with Yantrr Vayu2 4G modem, running on Debian 10. I am connecting to the internet using the PPP protocol and rnet. On the first PC everything ...
Matěj Musil's user avatar
0 votes
0 answers
114 views

Debian WWAN modem not working. HW or SW bug?

My internal modem stopped suddenly working and NetworkManager widget claims that the modem device is not activated. Now I try to figure out if it is either a software or hardware problem. If it is a ...
BBGhigno's user avatar
1 vote
2 answers
490 views

Trigger usb_modeswitch on boot for Huawei E3372 Modem

I am trying to make a Huawei Brovi E3372-325 USB LTE model work with a Raspberry Pi. Out of the box, it shows as a CDROM when plugging it in. (This is apparently used to automatically run the driver ...
LiterallyCode's user avatar
6 votes
1 answer
478 views

How do I spoof different device ID for the purposes of Linux device management?

I have a WWAN device, which I foolishly bricked by overwriting vendor and product ID (VID and PID) using AT command. I did it in hopes to get around the laptop whitelist feature, which prevented ...
galets's user avatar
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0 votes
1 answer
45 views

Udevadm doesn't auto trigger after suspended

I set up my USB modem with Ubuntu, so that it automatically switches to modem mode every time it suspends and resumes from sleep mode. Following the instructions from here [1], I was able to do it, ...
Nhan.Q's user avatar
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0 votes
1 answer
187 views

Setting PIN code for ZTE USB 4G Modem recognized as CDC Ethernet device in Linux

Currently facing an issue with setting the PIN code for a ZTE USB 4G modem on a Raspberry Pi 4 (running Rasbian Bookworm). The modem is recognized as a CDC Ethernet device (cdc_ether kernel module), ...
user3607022's user avatar
0 votes
2 answers
344 views

USB 4G Modem Not Detected on Raspberry Pi with NetworkManager

Am trying to set up a USB 4G modem on a Raspberry Pi using NetworkManager, but it doesn't seem to be detected. Here are the details of my setup: Raspberry Pi model: 4 USB 4G Modem: zte mf833u1 ...
user3607022's user avatar
0 votes
1 answer
26 views

Modem dropped in Raspberry Pi3 and I can find it anymore, despite it is visible with lsusb

So, I am facing a problem with several Rpi units I have here. Most of the time they work fine, but after several days, the LTE modem (TELIT 910C1-LA) stops working with no reason. Luckily, I could ...
Vinicius Jean Ferreira's user avatar
0 votes
1 answer
199 views

Configure access point on Ubuntu 20.04 with the wwan0 interface

I have Ubuntu 20.04 running on Raspberry Pi4 and have a 5G HAT to get it connected to the internet. I have a wwan0 network interface with the IP. Now I'd like to make this network available as an ...
Liudmila Dobriakova's user avatar
0 votes
2 answers
212 views

3G connection with ModemManager and Netplan connect and disconnect immediatly

I have a problem with an old 3G modem (Telit HE910), the connection is made via Netplan and ModemManager. The modem is recognized correctly when Ubuntu starts and the SIM is also recognized without ...
Cristian's user avatar
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0 answers
60 views

Modem manager problem on Slackware 15.0

On syslog of my Slackware 15.0 I see those annoying messages Oct 1 06:41:45 nas NetworkManager[1867]: <warn> [1696135305.0097] modem-manager: error poking ModemManager: GDBus.Error:org....
elbarna's user avatar
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-2 votes
2 answers
193 views

Using Modem in Linux Mint [closed]

How can I use this modem in Linux Mint ?
abu abu's user avatar
  • 99
0 votes
1 answer
381 views

Usb modem won't make a connection anymore

I have a new Mint Cinnamon 21.1 installation on my Dell Inspiron dual boot with Windows 7 and a problem with my usb modem Huawei E173u-2. Right after Mint installation modem worked great, it was ...
Avina's user avatar
  • 1
2 votes
1 answer
723 views

USB LTE modem without MAC address?

I'm connecting a linux machine using a nowadays popular Huawei Brovi E3372-325 LTE USB Stick to the internet. The special requirement is that incoming ssh/ping/NTP/... connections must reach my linux ...
gorogm's user avatar
  • 23
0 votes
0 answers
869 views

USB LTE modem "Brovi E3372-325" not working Ubuntu 20.04

This is a continuation of the issue stated in USB LTE modem "Brovi E3372-325" not working I have a similar issue as LaurentF. When I try to use the following udev rule # This is part of ...
wouter-heerwegh's user avatar
0 votes
5 answers
8k views

USB LTE modem "Brovi E3372-325" not working

I have problem new USB LTE modem Brovi E3372-325 I can't get it to work on linux. When connected to a USB port, the modem identifies itself as: # dmesg ... [ 6731.401923] usb 1-3.4.4: new high-speed ...
martin's user avatar
  • 111
1 vote
1 answer
117 views

How does my LTE modem show up as an unknown type "modem"

I have a Sierra Wireless RC7611 LTE module. I've put what I think are the relevant software versions below: # uname -r 5.4.215 # nmcli --version nmcli tool, version 1.22.10 # mmcli --version mmcli 1....
parsley72's user avatar
  • 289
0 votes
0 answers
117 views

No connection via 3G modem

I have an ERRCISON F5521gw internal 3G modem which I have been using for years with many versions of Ubuntu, but since I have installed Ubuntu Mate 22.04 it stopped working. Here is output of lsusb ...
vahid's user avatar
  • 1
1 vote
2 answers
1k views

How to assign physical USB modem to NetworkManager connection

I work on dual independent modem device (yocto based). I would like to assign each to a different NM connection. I register them using cmd: nmcli c add type gsm ifname cdc-wdm[0|1] con-name mdm1orange ...
JWZ1996's user avatar
  • 41
1 vote
1 answer
555 views

ModemManager + NetworkManager APN switching would kill modem flash?

I am working on a device with Quectel EG25G modem with multiplexed SIM card slot (poor man's dual sim:)). Such configuration will require often APN changing. I am afraid that it is possible to wear ...
JWZ1996's user avatar
  • 41
2 votes
2 answers
272 views

Internet via audio?

Alright, this may sound a little crazy, but let me explain. I have 2 desktops, one with a broken Ethernet port, and one with a working one. Both have an analog audio input/output, are running Linux, ...
Foxy6670's user avatar
1 vote
0 answers
85 views

No access to internet on Pop! OS with new ISP and new Modem

I'm running Pop! OS 20.04 LTS. Recently switched to new ISP (new modem/router). I have no problem connecting to the modem but then I don't have access to the internet. Some things to note: I only ...
user87317's user avatar
  • 111
2 votes
0 answers
711 views

Can’t send sms with ModemManager “GDBus…: Unknown error”

I have an internal mobile modem well detected and currently working for 4G internet. BTW, ModemManager also detect it: % mmcli -L /org/freedesktop/ModemManager1/Modem/0 [Hewlett-Packard] MU736 So,...
fauve's user avatar
  • 1,278
2 votes
1 answer
274 views

How to verify modem is a fax modem?

An HP 8440p laptop is outfitted with Ubuntu 16.04. It has a RJ11 telephone port, which may be a fax modem. This quick-spec document, provided by usr K-att, indicate it is a fax modem. Goals include: ...
gatorback's user avatar
  • 1,394
0 votes
0 answers
847 views

Huawei E3372H-320 AT Commands

I have a modem usb stick Huawei E3372H-320 and I'm trying to get it work with AT Commands. The problem is that I cannot see any ttyUSB inside /dev. The modem is recognized lsusb gives me: Bus 001 ...
failedmission's user avatar
0 votes
0 answers
1k views

pppd issue: Hangup (SIGHUP) Modem hangup

I am trying to connect a Telit moudle via USB interface on an embedded board. PPP connection is broken. From log, it shows “modem hangup” at the end. I did some research on internet and found some ...
Xuke's user avatar
  • 3
0 votes
1 answer
26 views

ISDN: how to set two channels with serial TA?

Playing with retro-computing I have successfully configured a isdn pci TA, to set up the connection I use a script like this #!/bin/sh isdnctrl addif ippp0 isdnctrl addslave ippp0 ippp1 isdnctrl eaz ...
elbarna's user avatar
  • 12.8k
1 vote
0 answers
1k views

Write firmware over /dev/ttyUSB0 to embedded device

I'm using the last example in: this post I keep getting wctx:file length=0 after the sz command. I'm actually opening the serial connection with minicom Minicom is botching the transfer. So, after I ...
Brian's user avatar
  • 168
0 votes
1 answer
3k views

ppp connection terminated: "No network protocols running"

I am new to ppp protocol and its configuration and got a problem that ppp connection terminated, no ppp0 created. This modem(telit lm960a18) works fine with this sim card and APN using network manager ...
Xuke's user avatar
  • 3
0 votes
0 answers
307 views

hylafax probemodem fails to probe USB modem

On Ubuntu 21.04 I'm having trouble adding a USB modem to my Hylafax 6.0.7 installation. It consistently fails to probe on two different USB modems: a USRobotics 5637 and a generic "USB 2.0 56K ...
jim's user avatar
  • 1
1 vote
1 answer
2k views

Modem Manager not detecting Qualcomm USB modem on Manjaro KDE

I use Manjaro KDE and I’ve been trying to use my Qualcomm modem on it, but the modem manager-gui is not detecting it. Here is the result of lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 ...
Rasheed's user avatar
  • 11
1 vote
1 answer
511 views

ModemManager - Unable to to send SMS with curly braces

I'm stuck on a problem using ModemManager (mmcli 1.14.2) to programmatically send SMS which contains a certain combination of special characters which I have yet to identify. The SMS I'm trying to ...
Andrew's user avatar
  • 11
0 votes
1 answer
1k views

script command from socat - /dev/ttyUSB0

A usb-modem connected to my Raspberry PI with Raspian lite. I've finally found a way to make it connect by issuing these two steps: sudo socat - /dev/ttyUSB1 and from within Socat I just write: AT^...
JUlinder's user avatar
  • 103
1 vote
0 answers
651 views

How to run wvdial for modem?

I have some problem during trying run command "wvdial", because i got error like: --> WvDial: Internet dialer version 1.61 --> Warning: section [Dialer Defaults] does not exist in ...
Creatorczyk's user avatar
3 votes
1 answer
5k views

USB Modem with modemmanager and networkmanager on embedded linux (yocto dunfell)

I am trying to get a USB Modem working on my embedded system which uses Linux from Yocto Dunfell with ModemManager and NetworkManager. As you can see below, I am able to connect the modem on the ...
Spark15's user avatar
  • 41
2 votes
0 answers
227 views

Trying to connect to a PCI Modem

I hope someone can offer some advice, I'm very new to linux/Debian so I'm sure it is probably me doing something stupid. I have just installed Debian on a pc that was running windows xp. But am stuck ...
Allan's user avatar
  • 21
0 votes
1 answer
312 views

Vodafone E3730 unable to usb_modeswitch

tl;dr Vodafone E3730 HSPA Express Data Card seems not to work at all in Kubuntu 18.04 LTS. How can I fix this? Description The card used to work. Frankly I don't remember if it worked in 18.04 LTS or ...
Kamil Maciorowski's user avatar
0 votes
1 answer
283 views

Minimal instalation CentOS USB modem LTE internet doesn't work

I am using a Huawei USB stick. Unfortunately I cannot connect to the Internet. It's a problem somewhere in DHCP, I guess, but I don't know. Could somebody help me?
Jan's user avatar
  • 1
1 vote
0 answers
278 views

How to manage audio in and out from and to file of Huawei GSM modems?

I've got a Huawei E173 USB dongle connected to a Raspberry PI. I'm trying to use the device to make and receive calls. For my purpose, it is needed (i) to save audio of the call to file and (ii) to ...
auino's user avatar
  • 111
0 votes
1 answer
2k views

Under Ubuntu 16/18, ttyACM sends unwanted AT commands on connection - how to stop this?

I have some external hardware running embedded Linux (a relatively old version of the kernel), loosely based off the old DaVinci DA850 development board. It communicates with the host PC over a USB ...
Graham's user avatar
  • 178
6 votes
2 answers
1k views

Why root user is not getting "Device or resource busy" response?

I am working with GSM modem and using /dev/ttyUSB2 device. Device is having proper rights: $ ls -alh /dev/ttyUSB2 crw-rw---- 1 root dialout 188, 2 May 25 19:44 /dev/ttyUSB2 I am in dialout group ...
DevilaN's user avatar
  • 1,986
4 votes
1 answer
10k views

GSM modem - get signal strength

I have setup a gsm connection through network manager (USB dongle, raspberry pi). It connects and works fine by managing it with nmcli. What I would like to see is the signal strength so that I can ...
eftshift0's user avatar
  • 605
1 vote
0 answers
115 views

AT modem command, how to detect frequency sent from a call

I am trying to use AT modem commands to call a phone number, receive a kissoff tone (at 1400 hz frequency), send 12 dtmf ones, and receive a handshake tone (different pure tone frequency) I know how ...
Jaz's user avatar
  • 11
0 votes
1 answer
984 views

Dial-up vintage BBS access with agetty and a modem

I'm trying to setup a 80's service with Mystic BBS (that runs on telnet), including a dial-up access with a U.S. Robotics modem connected to the serial port of the server. I succeeded with mgetty: /...
flip79's user avatar
  • 101
1 vote
1 answer
7k views

Linux ppp0 and default route and how to reach public internet

my project needs mobile internet. I am trying to achieve this by using a LTE stick modem with a M2M sim (public IP, no NAT) This works well on ubuntu (5.3.0-29-generic), but I cannot get it working ...
bem22's user avatar
  • 167
3 votes
0 answers
935 views

Modem not reconnectiong after 4G disconnect

In one of our systems we recently had the problem that after a disconnect from the 4G network the modem did not reestablish the connection, even thought the 4G connection was back up again. A manual ...
hdo's user avatar
  • 31
9 votes
2 answers
12k views

Difference between PPP, QMI and AT commands

During the past 6 days, I had the chance to interact with an LTE modem (https://sixfab.com/product/quectel-ec25-mini-pcle-4glte-module/), I managed to set up 4G Internet access on a Raspberry Pi using ...
Tor Tor's user avatar
  • 91
1 vote
1 answer
230 views

Why does plugging in a cellular modem create 8 different device files?

I am using a BeagleBone board running Debian. When I plug in a USB cellular modem, this creates the following files in the /dev folder: ttyACM0, ttyACM1, ttyACM2, ttyACM3, ttyModem0, ttyModem1, ...
Engineer999's user avatar
  • 1,171
2 votes
1 answer
607 views

Determine which device was assigned to a USB modem?

I'm testing a Tinker board, which is an ARM gadget running Debian 9.8. I inserted a USB modem. It appears the modem was detected but I can't find a device for it: [ 8178.815663] usb 1-1.1.5: new full-...
user avatar
0 votes
1 answer
452 views

SSH over incoming call from faxmodem possible?

I have a flaky broadband internet connection, and, seperated from that, a classic analog landline. Furthermore, I have a raspberry pi and a usb 56k-faxmodem. When I am not at home and can't reach my ...
LangerJan's user avatar

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