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----
-breadcrumbs:
-- - /chromium-os
-  - Chromium OS
-- - /chromium-os/how-tos-and-troubleshooting
-  - How Tos and Troubleshooting
-page_name: debugging-3g
-title: Debugging a cellular modem
----
-
-[TOC]
-
-## Communicating directly with a modem with the AT command set
-
-Most modems support AT commands which control the modem and query for
-information. On a Chromium OS device with the developer mode enabled, you can
-use the socat command to communicate with the modem. You need a Chromium OS
-device with a test image installed (or you can use `gmerge socat` if you are
-familiar with the dev server) . For example:
-
-*   Type `CTRL+ALT+T` to enter the crosh shell.
-*   Type `shell` to enter the bash shell.
-*   Figure you which USB device to use with: `ls /dev/ttyACM*
-            /dev/ttyUSB*`
-*   Stop modem manager if it is running: `sudo stop modemmanager`
-*   Type `sudo socat - /dev/ttyACM1,crnl` or `sudo socat - /dev/ttyUSB0
-            `to communicate with the modem.
-*   Ensure that the modem is enabled with the command: "`AT+CFUN=1`"
-
-For example:
-
-```none
-crosh> shell
-chronos@localhost ~ $ sudo stop modemmanager
-chronos@localhost ~ $ ls /dev/ttyACM* /dev/ttyUSB*
-/dev/ttyUSB0 /dev/ttyUSB1 /dev/ttyUSB2
-chronos@localhost ~ $ socat - /dev/ttyUSB1
-ATZ
-OK
-AT+CFUN=1
-OK
-ATI
-Manufacturer: Qualcomm Incorporated
-Model: ......
-Revision:....
-ESN: 0x80d...
-+GCAP: +CIS707A, ....
-chronos@localhost ~ $
-```
-
-Depending on the modem, you can try different AT commands, e.g. "AT+CGMI",
-"AT+CGSN", etc.
-
-## A notable exception: Gobi Modems
-
-While modems based on the Qualcomm Gobi chipset support AT commands, Chromium OS
-uses the Qualcomm connection management API to control these modems.
-
-## Using minicom
-
-One can also use minicom to communicate with the modem. This program is
-available in test images (or you can use `gmerge socat` if you are familiar with
-the dev server) .
-
-*   Type `CTRL-ALT-T` to enter the crosh shell.
-*   Type `shell` to enter the bash shell
-*   Figure you which usb device to use with: `ls /dev/ttyACM*
-            /dev/ttyUSB*`
-*   Stop modem manager if it is running: `sudo stop modem-manager`
-*   Type `sudo minicom -s`
-*   Ignore, "WARNING: configuration file not found"
-*   Use the down arrow key and enter to choose the menu **Serial port
-            setup**
-*   Type `A` to edit the **Serial Device**, changing it to
-            `/dev/ttyACM1` or `/dev/ttyUSB1`
-*   Press enter to return to the top level configuration menu
-*   Use the arrow keys and enter to select **Exit** which will exit
-            configuration and let you communicate with the modem.
-*   Use `CTRL-A x` to exit and` CTRL-A z` for help
-
-## Collecting Additional Logging
-
-Run the following crosh command to enable debug logging in modem manager at
-runtime (without restarting modem manager).
-
-```none
-crosh> modem set-logging debug
-```
-
-On a Chromium OS device with the developer modem enabled, you can restart modem
-manager with debug logging enabled.
-
-```none
-crosh> shell
-chronos@localhost ~ $ sudo restart modemmanager MM_LOGLEVEL=DEBUG
-```
-
-## Testing Download Speeds
-
-Chromium images include the sftp client, and also wget and curl for downloading.
-If you have a test build, it contains iperf too. You will need to enable
-developer mode on the platform before you are able to access the shell.
-
-*   Flip the dev switch to enable developer mode.
-*   Reboot the system
-*   Wait for system to wipe stateful partition.
-*   When booted, press CTRL+ALT+F2 (right arrow) to enter VT2 shell.
-*   Use username chronos or root. No password necessary.
-*   You can now use
-            [sftp](http://www.openbsd.org/cgi-bin/man.cgi?query=sftp&sektion=1),
-            [curl](http://curl.haxx.se/docs/manpage.html),
-            [wget](http://www.gnu.org/software/wget/manual/wget.html) or
-            [iperf](http://iperf.sourceforge.net/) for testing performance.
-\ No newline at end of file