Date: Thu, 3 Oct 2019 10:11:00 +0200 From: Hans Petter Selasky <hps@selasky.org> To: "O'Connor, Daniel" <darius@dons.net.au> Cc: Oleksandr Rybalko <ray@ddteam.net>, freebsd-usb@freebsd.org Subject: Re: USB serial ports by serial number Message-ID: <138601da-b6f9-f791-c6ef-ce54a4ae60e6@selasky.org> In-Reply-To: <366762AE-757E-4EB4-9A51-8B513FE7BC42@dons.net.au> References: <CC980A9B-8F41-4C2A-A729-2CC690DFDA7E@dons.net.au> <CAJ1Oi8HeyBvn4UYSDAh8gGxj0hPv-vgFZ9ArNX95CTniuQa80g@mail.gmail.com> <40CAFE90-B8F6-4A9B-A6D0-671D2DCEED52@dons.net.au> <1f0a3207-89fd-0ddb-6049-91f114381386@selasky.org> <366762AE-757E-4EB4-9A51-8B513FE7BC42@dons.net.au>
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On 2019-10-03 09:37, O'Connor, Daniel wrote: > > >> On 3 Oct 2019, at 17:01, Hans Petter Selasky <hps@selasky.org> wrote: >> On 2019-10-03 08:56, O'Connor, Daniel wrote: >>> Most of USB-serial devices have "very stable" serial number:) >>> more than 50% have S/N "0123456789". >> >> It is also allowed to have no serial number. > > Yes, that's why I match sernum to '.+' to skip those. > >> Maybe some kind of "lstty" would do. >> >> -l - list all devices >> -s - match by serial >> -v - match by vendor >> -p - match by product >> -i - match by interface ID >> -t - type [USB/PCI] >> >> which simply output the tty number you need. Could be an API we could add to libusb. > > The problem is you can't modify some program to call a new API a lot of the time but it is usually trivial to change which serial port it's configured to use. > You don't need to change any program: cu /dev/cuaU`lstty -s SERIAL` --HPS
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