Hello, 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 ModemManager Version : 1.12.8 menuconfig : (QMI on, MBIM off) git clone URL : https://github.com/openwrt/packages/tree/master/net/modemmanager 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 /sys/bus/usb/devices/2-1:1.2/net/wwan0 /sys/bus/usb/devices/2-1:1.2/net/wwan0/device/driver /sys/bus/usb/devices/2-1:1.2/net/wwan0/device /sys/bus/usb/devices/2-1:1.2/usbmisc/cdc-wdm0 /sys/devices/platform/1a0c0000.usb/usb2/2-1/2-1:1.2 Kernel modules watched via lsmod cdc_wdm 8821 1 qmi_wwan qmi_wwan 6252 0 usbcore 153512 20 option,usb_wwan,qmi_wwan,cdc_ncm,cdc_ether,usbserial,usbnet,usblp,cdc_wdm,cdc_acm,usb_storage,xhci_mtk,xhci_plat_hcd,xhci_pci,xhci_hcd,uhci_hcd,ohci_platform,ohci_hcd,ehci_platform,ehci_hcd 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 8.8.8.8 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 libmm-plugin-thuraya.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. Jeonghum
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