Zbt z8102 ax emmc modem detection in ECM mode

For Developers
1

@maurer after the fresh flash the router is not detecting automatically the modem (in ECM mode). I partially solved the issue adding: Kernel Modules → USB Support → kmod-usb-net-cdc-ether + kmod-usb-net-cdc-subset during compilation. But the modem get online when you force the wan to use usb0. I suppose your porting for zbt 8102 ax v2 (nand variant) is not affected. Correct?

https://forum.openwrt.org/t/sysupgrade-zbt-z8102ax-emmc-not-working/245596/34?u=giorez
https://github.com/openwrt/openwrt/pull/21995

2

most standard images don't come with the packages required for any kind of LTE modem.

add usb0 to the wan firewall zone, do you have wired wan hooked up at the same time ?

3

could you guide to accomplish this tip? thanks in advance

4

don't have access to any openwrt device at the moment, in the modem interface you've set up, there's a list box with zone assignment, it should be wan.

5

Please start from showing the output from cat /sys/kernel/debug/usb/devices

6

ciao @AndrewZ thanks for replying. here is the query output:

root@OpenWrt:~# ls /dev
bus           loop2         mmcblk0p3     shm           ttyUSB3
console       loop3         mmcblk0p4     stderr        ubi_ctrl
fd            loop4         mmcblk0p5     stdin         urandom
full          loop5         mmcblk0p6     stdout        watchdog
gpiochip0     loop6         mmcblk0rpmb   tty           watchdog0
hwrng         loop7         null          ttyS0         watchdog1
kmsg          mmcblk0       port          ttyS1         zero
log           mmcblk0boot0  ppp           ttyS2
loop-control  mmcblk0boot1  ptmx          ttyUSB0
loop0         mmcblk0p1     pts           ttyUSB1
loop1         mmcblk0p2     random        ttyUSB2


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= 6.12
S:  Manufacturer=Linux 6.12.69 xhci-hcd
S:  Product=xHCI Host Controller
S:  SerialNumber=11200000.usb
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= 4
D:  Ver= 2.10 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=05e3 ProdID=0610 Rev= 6.63
S:  Manufacturer=GenesysLogic
S:  Product=USB2.1 Hub
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   1 Ivl=256ms

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=10000 MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 3.10 Cls=09(hub  ) Sub=00 Prot=03 MxPS= 9 #Cfgs=  1
P:  Vendor=1d6b ProdID=0003 Rev= 6.12
S:  Manufacturer=Linux 6.12.69 xhci-hcd
S:  Product=xHCI Host Controller
S:  SerialNumber=11200000.usb
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=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=5000 MxCh= 4
D:  Ver= 3.20 Cls=09(hub  ) Sub=00 Prot=03 MxPS= 9 #Cfgs=  1
P:  Vendor=05e3 ProdID=0626 Rev= 6.63
S:  Manufacturer=GenesysLogic
S:  Product=USB3.1 Hub
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=13(Int.) MxPS=   2 Ivl=16ms

T:  Bus=02 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#=  3 Spd=5000 MxCh= 0
D:  Ver= 3.20 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 9 #Cfgs=  1
P:  Vendor=2c7c ProdID=0122 Rev= 5.15
S:  Manufacturer=Quectel
S:  Product=RM551E-GL
S:  SerialNumber=4ec33ae0
C:* #Ifs= 7 Cfg#= 1 Atr=a0 MxPwr=896mA
A:  FirstIf#=10 IfCount= 2 Cls=02(comm.) Sub=06 Prot=00
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=30 Driver=option
E:  Ad=01(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=81(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=82(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=84(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=83(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=86(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=85(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#= 5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)
E:  Ad=05(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=87(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
I:* If#=10 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=cdc_ether
E:  Ad=89(I) Atr=03(Int.) MxPS=  16 Ivl=32ms
I:  If#=11 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
I:* If#=11 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
E:  Ad=88(I) Atr=02(Bulk) MxPS=1024 Ivl=0ms
E:  Ad=06(O) Atr=02(Bulk) MxPS=1024 Ivl=0ms
root@OpenWrt:~#
7

You need to follow https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_cdc
I suggest you search Quectel forum for information on IP passthrough configration with this modem.

Alternatively you can try switching the modem to MBIM or QMI and follow https://openwrt.org/docs/guide-user/network/wan/wwan/ltedongle
This may require updating your modem firmware.

1 Like
8

hi @andrewz, i succesfully solved the issue. setting manually those commands. i wonder if same result can be achieved througt uci-defaults at first boot or hardcoded into firmware compilation. any tip for this?