On Dec 2, 2014, at 3:24 AM, Bjørn Mork <bj...@mork.no> wrote:

> Dmitriy Fitisov <dmit...@radier.ca> writes:
> 
>> we have a small device of our own, which communicates through serial USB on 
>> Windows.
>> Now we need it to work on Raspberry (yes, I know this is Debian, which is 
>> Raspberry based on).
>> USB descriptors configured as a modem, so, when I connect it to Linux, 
>> cdc-acm module is loaded.
>> However, there is apparently some process which is watching modems, so on 
>> connection
>> I got some info on my device - on Ubuntu it is AT commands, for which I have 
>> adapted firmware
>> (seems ModemManager is running), but on Raspberry I cannot find out what 
>> process attaches 
>> to my "modem" and what it wants.
> 
> lsof /dev/ttyACM0
> 

That I also tried last week. Nothing is open.
It is like "probe on startup", some program does not recognize it as a valid 
terminal and close it.
Just how it seems to me.

I would not care about that, but my firmware receives some data which I do not 
expect at that time.

> 
> Bjørn
> 
> 
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