How to avoid "ATE1 E0" sequence

[Gregoire Gentil]

This is a very painful bug and I wish to know where it comes from 
(minicom, kernel or embedded OS).

When my embedded device uses the USB gadget configfs CDC_ACM 
(vendor:0525 product:a4a7), I see this sequence sent to minicom. I don't 
think that minicom creates it but perhaps it doesn't handle it.

My embedded device OS is custom-made and it only does in the inittab:
::respawn:/sbin/getty -8 115200 ttyGS0 vt100

There is no Ubuntu, no modem manager and so on. I still don't get what 
is sending the ATE1 E0 which blocks minicom for 30 seconds. I have a 
tendency to think that it's the USB gadget kernel driver but I can't 
figure out where,

Grégoire



On 6/13/19 8:54 AM, Adam Lackorzynski wrote:
> 
> On Wed Jun 12, 2019 at 12:05:33 -0700, Gregoire Gentil wrote:
>> Hello,
>>
>> Each time I use minicom to my embedded device, I get the following:
>>
>> OPTIONS: I18n
>> Compiled on Aug 13 2017, 15:25:34.
>> Port /dev/ttyACM0, 12:02:43
>>
>> Press CTRL-A Z for help on special keys
>>
>>
>>
>> Login incorrect
>> inout login: ATE1 E0
>> Password:
>>
>>
>> How can I avoid that Minicom sends the modem command? I have tried to
>> disabled/put to zero everything in the modem setting screen - but no change,
> 
> This is typically the "Init string" in the "modem and dialing" menu but
> as you have cleared that I wonder too where this comes from.
> Do you also have a "pu minit" line in your config file?
> Also, the string "ATE1" is not part of minicom's source, so where could
> it come from?
> 
> 
> Adam
>