AT Commands, TIMEOUT ERROR

[MrEdLu]

Hi Folks,

My we826 with EM12-G one day decided to stop working, All AT commands results in Timeout error. The Debug Information (AT-Command Execution) shows...

Tue Jul 13 16:41:15 2021 : /dev/ttyUSB2
TIMEOUT ERROR

Tue Jul 13 16:41:52 2021 : /dev/ttyUSB2
TIMEOUT ERROR

Tue Jul 13 16:42:29 2021 : /dev/ttyUSB2
TIMEOUT ERROR

Tue Jul 13 16:43:00 2021 : /dev/ttyUSB2

Tue Jul 13 16:43:38 2021 : /dev/ttyUSB2
TIMEOUT ERROR

Device information shows...

Device Information
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 1, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 4.09
S: Manufacturer=Linux 4.9.211 ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=ehci-platform.0
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#= 5 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=2c7c ProdID=0512 Rev= 3.18
S: Manufacturer=Quectel
S: Product=EM12-G
S: SerialNumber=0123456789ABCDEF
C:* #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=500mA
A: FirstIf#= 8 IfCount= 2 Cls=02(comm.) Sub=0e Prot=00
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=83(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=85(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=87(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 8 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=0e Prot=00 Driver=cdc_mbim
E: Ad=88(I) Atr=03(Int.) MxPS= 64 Ivl=32ms
I: If#= 9 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
I:* If#= 9 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
E: Ad=8e(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=0f(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
********************************************************************************************************
T: Bus=02 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= 4.09
S: Manufacturer=Linux 4.9.211 ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=ehci-platform.1
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

In troubleshooting, I try taking out the em12-g and plugging into a windows computer to flash the firmware. Firmware upgrade was successfully. I have also try the em12-g in a TP-Link TL1023nd. Getting the same result, "TIMEOUT ERROR".

Please help. Thanks!

[Didneywhorl]

Reflash the router firmware, maybe get a latest firmware image for the router. Flash it 3x in a row without saving or reloading your settings. Manually reenter them after you reflash the router the last time.

Also check to see if you can send AT commands to it in your PC.

Is odd though that you got it to do the same in both routers.

[MrEdLu]

Just a follow up on this. I gave up and bought a Dell DW5811E / EM7455 to replace the em12-g. It is not as fast but but cost a lot less and works perfectly with my existing setup.