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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Fibocom L831-EA LTE Modem not accessible / Intel Power Management IC Device for Linux

I own an Intel Atom based Tablet PC and I would like to install Debian 11.5 The Tablet is equipped with a Fibocom L831-EA LTE Modem. Unfortunately this modem is not recognised within Debian, neither ...
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4G LTE USB not working on ubuntu

I have bought a 4G LTE USB from Amazon. It works on windows and i was able to connect to 4G using the software that comes with the USB. I was trying to connect to use the USB on Ubuntu, and i followed ...
1 vote
1 answer
74 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, ...
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Unable to used wired modem with usb_modeswitch

I just got a secondhand huawei speedbox LTE mini 2 (E5786s) and it's working fantastic with my laptop. After checking furthermore, I saw that it can be used as a wired modem by directly plugging it ...
1 vote
0 answers
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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 ...
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Get tty device paths for zte MF710M modem

i am trying to get the device paths for my modem zte MF710M using this script #get all connected devices usb-devices T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 21 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=...
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SARA-U201 modem on Beaglebone Black not starting automatically

I have SARA-U201 modem connected by USB to Beaglebone Black single-board computer. It is configured to run in ECM mode by AT+UUSBCONF=2 command. On boot, there are /dev/ttyACM[0-3] - 4 ports created ...
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139 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,...
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Ubuntu ping between modem and ethernet port via internally

Looking to solve a problem on: First PC, Ubuntu 18.04.5, contains one ethernet ports enp1s0 and one modem port wwan0 enp1s0 is 192.168.1.10 wwan0 is 2.149.113.40 Second PC, ubuntu 18.04, contains one ...
2 votes
1 answer
118 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: ...
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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 ...
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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 ...
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1 answer
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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 ...
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Identifying the current pppd and chat scripts on a cell modem without ModemManager

I have a Sierra Wireless E362 card, branded as a Novatel Wireless. I have this in my router and want to use it as a failover device. Bus 001 Device 002: ID 1410:9010 Novatel Wireless Expedite E362 I ...
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Alpine Linux: NetworkManager does not enroll wwan0 device

I have a small PC with an included GSM-modem which I need to have working with NetworkManager under Alpine Linux v3.14 x86 (so nmcli and mmcli works, both network and modem manager have been installed)...
1 vote
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292 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 ...
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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 ...
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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 ...
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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 is. Here is the result of lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 ...
1 vote
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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 ...
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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^...
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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 ...
2 votes
1 answer
2k 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 ...
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2 votes
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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 ...
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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 to fix this? Description The card used to work. Frankly I don't remember if it worked in 18.04 LTS or in ...
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1 answer
203 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?
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1 vote
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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 ...
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1 answer
974 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 ...
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6 votes
2 answers
205 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 ...
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2 votes
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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 ...
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1 vote
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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 ...
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1 answer
615 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: /...
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1 vote
1 answer
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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 ...
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3 votes
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656 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 ...
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1 vote
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USB GSM modems become unresponsive when many are accessed at the same time

I'm working at a project that requires concurrent access to multiple USB serial devices (modems) through the Linux option driver. The USB modems are connected through an USB 3.0 hub. As I connect ...
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8 votes
2 answers
8k 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 ...
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1 vote
1 answer
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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, ...
2 votes
1 answer
450 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-...
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2 votes
0 answers
444 views

Network-/ModemManager doesn't unlock SIM automatically

I use nmcli to set up a gsm connection in Ubuntu 16.04. Configuring this connection I set the gsm.pin property and auto-reconnect is enabled. When nmcli tries to connect it says that the modem is in ...
0 votes
1 answer
348 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 ...
2 votes
1 answer
511 views

USSD in ZTE MF833T

The ZTE MF833T modem directly runs as USB Ethernet but is not detected by Modem Manager GUI. I have to manage settings using its IP address http://192.168.0.1/. Is it possible to send USSD requests ...
2 votes
4 answers
1k views

Is there a way for linux to display caller id?

After switching to linux, one thing i miss is something called phonetray, which displayed caller ID to my screen. I wondered if there is a way for Linux to do something similar. I found a blog ...
2 votes
0 answers
596 views

How to script AT command to modem?

Every time my USB modem (/dev/dlinkModem) gets unplugged it defaults to "radio disabled mode" (AT+CFUN:4). I can easily enough call AT+CFUN:1 through the minicom application console to enable radio ...
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3 votes
1 answer
2k views

Convert sound encoded in RTTY 45.45 baud using minimodem

I've downloaded a file encoded in RTTY 45.45 baud (mp3 output of linked video). I'm not sure if the final output should be audio or text. I've also installed minimodem which I'm reading can convert ...
0 votes
1 answer
41 views

Redirecting stdout makes modem unable to connect

I'm running Yocto with busybox on an embedded system with a Telit modem. If I launch the main program, script A, with ./script_A & there's no problem at all and the modem connects on the first ...
1 vote
1 answer
132 views

How Do I Find The Mobile Provider From 4G Dongle?

I have two or more 4G dongles connected via USB. I have set up multiple configuration files (one for each provider), but short of a visual inspection (which for this project won't be possible in the ...
1 vote
2 answers
516 views

SSH connection problem (timeout) from outside to ppp0 interface (4G modem) on Raspberry Pi [closed]

I am having difficulty establishing SSH connection from outside to Raspberry Pi that has USB 4G modem as interface. I get timeout when trying to connect with ssh: ssh -l pi ccc.ccc.ccc.ccc -p 22 ...
0 votes
0 answers
80 views

huawei e800 expresscard modem not being recognized by manjaro

I'm trying to get a Huawei e800 expresscard / PCMCIA card modem to work in manjaro linux, but modemmanager is not detecting it at all, let alone let me configure a connection with it. The status light ...
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1 answer
770 views

Unable to access modem IP through Linksys EA2700 router

Router IP: 192.168.1.1 (Linksys EA2700) Modem IP: 192.168.100.1 (Technicolor TC4350) Everything here refers to a wired configuration. Entering the modem IP in a browser address bar returns an ...
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Why "receive / transmit bytes" is so big difference between optical modem and host when download data on host?

ens33 is my host network card,it show a normal number as my network use status,but I don't know why my modem show a very small data traffic in all interfaces of modem when download on host. My host: ...

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