Re: [Owfs-developers] Issues with FTDI based USB-Serial dongle & DS2480B

[Johan S. <jo...@st...>]

On 22/09/14 00:21, Robin Gilks wrote:
>> 1. Trying to resolve a serial port TTY name (i.e. /dev/cuaU1 on FreeBSD)
>> to a potential USB device is probably doable, but not without a lot of
>> effort and OS specific code.
>> I don't think it's worth trying to go down that road.
>>
> How about using udev on Linux (is there an equivalent on other OSes?) that
> creates a symlink to a device node with a unique name from the type (FTDI)
> and bus number and OWFS looks for that specific device name.
>
> Just an idea (had to do that years ago with serial devices to sort out a
> connection to a weather station and an IR blaster, never sure what device
> names each would come up with!).
>
>

I have a similar setup myself, using FreeBSD's devd. It uses my known,
hard-coded USB serials to set up a symlink from /dev/cua-linkusb to
/dev/cuaXXX when device is detected, to easier find which tty device I
should be using for what (I think I have ~4 serial ports on my box)

However, this doesn't solve the auto-deteciton problem, the user still
needs to manually tell which USB device to be used, by serial-no or
otherwise. And if that has to be done, it could just as well be done
directly in owfs.