[OpenWrt-Devel] [ModemManager] How can I make ModemManager work right?
bobafetthotmail at gmail.com
Wed Apr 29 02:50:10 EDT 2020
On 29/04/20 08:29, Jeonghum Joh wrote:
> Thanks to many people in this list, I was able to find ModemManager and
> I've tried applying it.
> ==== Testing environment ====
> Target Model : MediaTek MT7622 AC4300rfb1 board
> Firmware Version : LEDE Reboot 17.01-SNAPSHOT unknown / LuCI
> Kernel Version : 4.4.124
> Modem : HUCOM HM-900
> Version : 1.12.8
> menuconfig : (QMI on, MBIM off)
> git clone URL :
> Noted Device Files : Those files and paths are noted/watched
> qmichannel : /dev/cdc-wdm0
> usbnet_adapter : /sys/class/net/wwan0
> /sys/bus/usb/devices/2-1/manufacturer : QCOM
> /sys/bus/usb/devices/2-1/idVendor :05C6
> /sys/bus/usb/devices/2-1/idProduct :90db
> /sys/bus/usb/devices/2-1/speed :5000
> /sys/bus/usb/devices/2-1/product :SDXPRAIRIE-MTP _SN:B02CE51B
> /sys/bus/usb/devices/2-1/version :3.20
> Kernel modules watched via lsmod
> cdc_wdm 8821 1 qmi_wwan
> qmi_wwan 6252 0
> usbcore 153512 20
> usbnet 19027 3 qmi_wwan,cdc_ncm,cdc_ether
> Above is original environment.
> On this circumstances, I disabled CM provided from modem provider : hucom-cm
> And I added one configuration section into the bottom of
> /etc/config/network :
> config interface 'broadband'
> option device '/sys/devices/platform/1a0c0000.usb/usb2/2-1/2-1:1.2'
> option proto 'modemmanager'
> option apn '5g-internet.sktelecom.com
> option username ''
> option password ''
> option pincode ''
> option lowpower '1'
> Under these settings, I confirmed that
> - hucom-cm is disabled
> - ModemManager is alive
> 4430 root 229m D /usr/sbin/ModemManager
> The wwan0 is not shown from ifconfig and ping 220.127.116.11 fails saying
> Network is unreachable.
> So, My first trying to utilize MM seemed to be failed.
> Originally hucom-cm sets bridge mode like shown below:
> BRIDGE_MODE_FILE : /sys/module/qmi_wwan/parameters/bridge_mode
> BRIDGE_IPV4_FILE : /sys/module/qmi_wwan/parameters/bridge_ipv4
> But under ModemManager these files are not shown.
> And I've found many plugin libraries under /usr/lib/ModemManager:
> libmm-plugin-altair-lte.so libmm-plugin-mtk.so
> Could someone help me?
> Do I need to look deeper into ModemManager?
> Do I need to implement new plugin library for our product?
> Or do I need to forget about ModemManager?
> My already given hucom-cm anyway works. It brings data via wwan0 and
> establish network interface wwan0.
> Problem is that hucom-cm sets up firewall rules and routing settings
> redundantly and unnecessarily. So I can make it not to do these unneeded
> settings. This way would be good approach I believe.
> But we'd like to make our product indepecntant from specific modem. I
> guessed that opensource ModemManager infrastructure would give us some
> sort of independence from specific modem and in other words it would
> give some abstraction..
> I am not sure of anything. Could someone give me some light so that I
> can find the best way to go?
> Additional question : If I write our own logic as a plugin library of
> ModemManager, wouldn't it necessarily have to stick to GPL? Can we apply
> commercial license for the plugin?
> Thank you very much in advance.
If none answers better in this mailing list, development and licensing
questions about ModemManager should probably be asked in its own mailing
As it is not a package developed by OpenWrt, it is used by desktop Linux
distributions too (Ubuntu, RHEL, SUSE and most others), Openwrt only
provides the package and integrates its config with uci.
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