[GTALUG] Problem with /dev/ttyUSB* serial port

[Jim Ruxton]

>> The other option is to write your software so that it gets notified 
>> when a USB device is installed/removed. You will be told the actual 
>> device name. I needed to do this to detect insertion/removal of a 
>> barcode reader.
>>
> Looking at the actual code it is setting a default value of /dev/ttyUSB0.
> It should not be defaulting when you try to set it in the call but it 
> may be interesting to set the default to /dev/null so that it will not 
> do something that may be reasonable part of the time.
>
> When you say that you cannot get anything but /dev/ttyUSB0 to work it 
> makes me ask is there a problem that is causing the default to always 
> be taken.
>
> Forcibly breaking things can be a useful tool.

Thanks very much for looking at the code. I believe I found my culprit. 
I had another daemon running in the background for a lighting program 
that was trying to get a lock on /dev/ttyUSB1 . If I stop that daemon 
loading /dev/ttyUSB1 will now work for me. I'm going to reconfigure that 
daemon to leave the serial ports alone since I am not using that feature 
of the lighting program. Thanks again to everyone who helped me with 
this. In the process I also set up a udev rule so I can now just load my 
serial port as /dev/motor and let udev create the symlinks .

Cheers,

Jim