On 25 September 2014 11:10, Stefano Miccoli <mo...@icloud.com> wrote:
>
> On 24 Sep 2014, at 16:21, Tomasz Torcz <to...@pipebreaker.pl> wrote:
>
> On Wed, Sep 24, 2014 at 04:09:23PM +0200, Ekkehard Pofahl wrote:
>
> 2014-09-24 12:29 GMT+02:00 Colin Law <clan...@gmail.com>:
>
> unplug a linkUSB and plug it straight back in then it may change
>
>
>
> Agreed. But plugging and unplugging is usually not done on a "production"
> system. After reboot you should see the same configuration every time ?
>
>
> There's no guarentee, USB inherently dynamic bus. Using persistent device
> names (/dev/serial/by-id/ etc.) is the only sane way.
>
>
> or by udev rules. For my LinkUSB I use
>
> SUBSYSTEM=="tty", \
> ATTRS{product}=="FT232R USB UART", ATTRS{serial}=="XXXXXXXX", \
> SYMLINK+="linkUSB0", GROUP="owfs"
>
> where I got the XXXXXXXX serial number by inspecting the output of
>
> udevadm info -n /dev/ttyUSB0 -a
>
> so udev setups a symlink from /dev/linkUSB0 to the correct /dev/ttyUSB<n>
>
> The same /dev/ttyUSB<n> is accessible as
> /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_XXXXXXXX-if00-port0
> but I prefer the shorter "ad hoc" one.
>
> Both the custom /dev/linkUSB0 and the default /dev/serial/... are in charge
> of udev, so on openWRT you have to check if udev is installed and its
> configuration files.
udev is not installed by default, but I see it is available. I have
not got much flash (ie disc) space though so I will have to find how
big it is. The TPLink-703N starts with 2MB (yes MB) of flash and I
have got just 252k left.
Another possibility I think is hotplug, which is installed as
standard. Using that I can run a script when the linkusb comes up or
down and use that to restart owserver on the new port.
Thanks all for the suggestions.
Colin
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