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Fibocom NL668-EAU mPCIe LTE CAT-4

Article Number: 10893
Manufacturer: Fibocom
Supplier number: NL668-EAU-00-MINIPCI

The Fibocom NL668-EAU is a LTE CAT-4 wireless communication module in mPCIe format. It supports LTE-TDD / LTE-FDD with fallback on 3G and 2G. Fibocom NL668 can be used in industrial routing, security, Internet of Vehicles and other industries.

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UMTS Bands
B1 (2100)
B8 (900)
B5 (850)
MIMO (Multiple-Input Multiple-Output)
Yes
LTE Bands
B1 (2100)
B3 (1800)
B7 (2600)
B8 (900)
B20 (800DD)
B5 (850)
B38 (TDD 2600)
B40 (TDD 2300)
B28 (700 APAC)
B41 (TDD 2500)
GSM/EDGE Bands
B5 (850)
B8 (900)
B3 (1800)
Manufacturer
Fibocom
LTE Region
Europe
Australia
Form Factor
mPCIe - full size
mPCIe
Technology
LTE - cat 4
Antenna Interface
IPEX MHF/U.FL
GPS
Yes
Max DL Speed
150 Mbps
Max UL Speed
50 Mbps
Operating Temperature Range
-30 °C – 75 °C
Driver Support
Windows 7
Linux
Android
Windows 8
Windows 10
Interface
USB 2.0
Carrier Certification
Telstra
Certification
GCF
ANATEL
RCM
CE RED

Datasheet for Fibocom NL668-EAU mPCIe

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Uploaded at
2019-02-20 11:43:05
Last updated
2019-02-20 11:43:05
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Fibocom NL668-EAU mPCIe LTE CAT-4

FIBOCOM NL668 Hardware User Manual describes the electrical characteristics, RF performance, structure size, application environment, etc. of the NL668module.

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Uploaded at
2020-03-09 11:29:11
Last updated
2020-03-09 11:29:11
Version
R1.0.3
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Fibocom NL668-EAU mPCIe LTE CAT-4

FIBOCOM NL668 AT Commands User Manual introduces the AT commands set of Fibocom family products, and describes hos the users can communicate with the devices using these commands.

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Uploaded at
2020-02-18 17:06:03
Last updated
2020-02-18 17:06:03
Version
R3.4
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Fibocom NL668-EAU mPCIe LTE CAT-4

FIBOCOM NL668 Application Guide Linux describes ECM dial for the NL668-CN series wireless module.

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Uploaded at
2020-02-18 17:05:54
Last updated
2020-02-18 17:05:54
Version
R1
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Fibocom NL668-EAU mPCIe LTE CAT-4

Fibcom NL668 Software Integration Guide R2 describes the common service process of the NL668 module
and provides reference for engineers of client application software development.

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Uploaded at
2020-02-18 15:33:15
Last updated
2020-02-18 15:33:15
Version
R2
Related products
Fibocom NL668-EAU mPCIe LTE CAT-4
Question

How to set up a simple data connection over Qualcomm QMI interface using libqmi and driver qmi_wwan in Linux?

Solution

Several cellular modules based on Qualcomm chipsets implements the Qualcomm MSM QMI RMNET Interface.
There is a open source Linux in-kernel driver supporting this interface called qmi_wwan. The helper library libqmi can be used to communicate with the cellular devices over the interface and do cellular module configurations to control and trigger the data connection over the cellular network.

Install the libqmi Linux library using e.g. your OS package manager like apt etc.
(Check out the official libqmi page here: https://www.freedesktop.org/wiki/Software/libqmi/)
Please be aware that libqmi is a 3rd party software not distributed by the chipset or module vendors. So full compatibility on all available commands should not be expected.
There are Qualcomm chipset standard QMI commands and in addition vendors specific custom QMI commands not supported by all manufacturers, but still available in libqmi. There are also new QMI commands not supported in older chipsets and vice versa, old QMI commands no longer supported in new chipset series.

Verify that you have the Linux in-kernel qmi_wwan driver installed and loaded for the cellular modules QMI interface endpoint over USB:
lsusb -t

Can look like this:
...
|__ Port 1: Dev 3, If 2, Class=Vendor Specific Class, Driver=qmi_wwan, 480M
...

If the driver is not loaded correctly, please verify that the cellular module is set to expose QMI RMNET network interface endpoint in its configuration. How to do so can often be found in AT commands guides, Linux implementation guides and similar from the cellular module vendors.

Libqmi library include a command line tool qmicli that can be used in a more convenient way communicate directly with the module over QMI interface for testing, scripting and troubleshooting.

The qmicli help will output information about all commands available:
qmicli --help-all

The qmi_wwan network control interfaces for modules are usually named like cdc-wdm# under /dev/ path.
Use the attribute --device or -d to specify it for qmicli in your command execution:
qmicli --device=/dev/cdc-wdm0
qmicli -d /dev/cdc-wdm0

In order to ease usage of the QMI interface and handle parallell command requests, libqmi include a proxy function to handle it correctly on the QMI interface, To use it, make sure to have the the attribute present in the qmicli command:
-p
--device-open-proxy

Example commands on how to communicate
Request module manufacturer:
qmicli -p -d /dev/cdc-wdm0 --dms-get-manufacturer

Get module model:
qmicli -p -d /dev/cdc-wdm0 --dms-get-model

Get firmware version:
qmicli -p -d /dev/cdc-wdm0 --dms-get-revision

Get module IDs (IMEI etc.):
qmicli -p -d /dev/cdc-wdm0 --dms-get-ids

Get SIM card status:
qmicli -p -d /dev/cdc-wdm0 --uim-get-card-status

The script qmi-network can be used to establish a simple data connection, it will automatically try to verify the IP framing type match them correctly between qmi_wwan driver and module (Raw-IP vs. 802.3 IP framing).

Create a config file containing your network operator APN details and if needed, the username and password.
Save it e.g. in the default location /etc/qmi-network.conf
The parameter --profile=[PATH] can be used to define the path to config when executing qmi-network.

Example config file content: APN details and enabling of proxy usage.
Add the username and password lines if it is needed for your APN:
APN=my-network-operators-apn
APN_USER=my-apn-username
APN_PASS=my-apn-password
PROXY=yes

Once the APN information is saved, you can start the network connection with the command:
qmi-network /dev/cdc-wdm0 start

The name of the related network interface in the Linux system can be acquired with the command:
qmicli -p -d /dev/cdc-wdm0 --get-wwan-iface

Once you see "Network started successfully" message, you can send a DHCP request on the network interface.
Please note that not all DHCP clients in Linux can handle Raw-IP format but udhcpc support it.
udhcpc -q -f -i wwan0

The IP information from the cellular network can also be acquired and set manually to the network interface by the user or scripting, the correct address details can be acquired from the cellular module over QMI with command:
qmicli -p -d /dev/cdc-wdm0 --wds-get-current-settings

If the connection was successfully set up and established, you now have a data connection. Ping request to a remote server using the cellular network interface can prove this:
ping -I wwan0 8.8.8.8

The ifconfig Linux tool can show the current details for the network interface:
ifconfig wwan0

To bring down and stop the cellular network connection, please use the stop command bellow:
qmi-network /dev/cdc-wdm0 stop

The ModemManager tool for Linux is based on libqmi. NetworkManager and ModemManager . Please note however that these two tools expect the cellular module interfaces to only be used by them so if you manually want to use the libqmi library or AT commands interfaces, please turn off/disable ModemManager and NetworkManager first.

The libqmi is a generic open source library for Linux systems and QMI protocol from Qualcomm, therefor there are several commands only working on selected devices and not necessarily on supported in the specific device you use, resulting in an error message.

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