OpenWrt Forum Archive

Post #1

cjhx

16 May 2016, 21:58

Having great trouble getting a 4g USB (ZTE MF823) to work with a router (TL-MR3020).

The USB device doesn't seem to be recognised - I've got no ttyUSBx under /dev/.

I started with the image suggested for the MR3020 (openwrt-15.05-ar71xx-generic-tl-mr3020-v1-squashfs-factory.bin)

To this I've added a few packages:

comgt
chat
luci-proto-3g

I've then added the interface config:

config interface 'wan'
        option ifname 'ppp0'
        option apn 3internet
        option service umts
        option proto 3g
        option device /dev/ttyUSB0

The device seems to be recognised in some form:

root@OpenWrt:~# cat /sys/kernel/debug/usb/devices

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 3.18
S:  Manufacturer=Linux 3.18.20 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=ehci-platform
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=19d2 ProdID=1225 Rev=f0.70
S:  Manufacturer=ZTE,Incorporated
S:  Product=ZTE WCDMA Technologies MSM
S:  SerialNumber=MF8230ZTED010000
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=(none)
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=125us

Though the output from dmesg doesn't quite match up with what I'm expecting based on https://wiki.openwrt.org/doc/recipes/3gdongle

[    4.120000] usbcore: registered new interface driver usbfs
[    4.120000] usbcore: registered new interface driver hub
[    4.130000] usbcore: registered new device driver usb
[    4.140000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    4.150000] ehci-platform: EHCI generic platform driver
[    4.150000] ehci-platform ehci-platform: EHCI Host Controller
[    4.160000] ehci-platform ehci-platform: new USB bus registered, assigned bus number 1
[    4.170000] ehci-platform ehci-platform: irq 3, io mem 0x1b000000
[    4.190000] ehci-platform ehci-platform: USB 2.0 started, EHCI 1.00
[    4.190000] hub 1-0:1.0: USB hub found
[    4.190000] hub 1-0:1.0: 1 port detected
[    4.520000] usb 1-1: new high-speed USB device number 2 using ehci-platform

The closest I can find is under /dev/bus/usb/001/001 or /002... but subbing that in to the interface config doesn't work either.

Pulling my hair out on this one... any suggestions appreciated!

(Last edited by cjhx on 16 May 2016, 22:03)

Post #2

epollari

17 Feb 2017, 22:34

The ZTE MF823 acts like a network adapter, not like a USB modem. It need RNDIS and/or CDC drivers. It's all in the 3G Dongle recipe that you quoted.

Post #3

mk24

17 Feb 2017, 22:49

To this I've added a few packages:
comgt
chat
luci-proto-3g

You don't need any of them with a modern 4G device. Remove those before installing cdc so you don't overfill the flash.