<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div class="ydp9fa9d7e8yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
        <div><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">>I'm struggling to understand what you mean exactly by serial number in this context.</span></span><br></div><div><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br></span></span></div><div><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">Yes, FTDI has a unique serial number. Although I have heard of duplicates, but that would not be the norm. I cannot speak for other USB chip sets. </span></span></div><div><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;"><br></span></span></div><div><span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">Well I say I will move on from Ubuntu, but I still have it, albeit old. Yet even this old Ubuntu version I have is more current than RedHat (Centos) 7 on libraries. So I still use it. Time will tell if Debian can fully replace Ubuntu. They do a good job of coordinating alot of software. However my hope is Debian does too. Time will tell and I am not in a hurry. Mainly I use Debian for embedded stuff and I have come to really like it.</span></span></div><div><br></div>
        
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                    On Thursday, February 28, 2019, 11:27:42 AM EST, Pete Soper via TriEmbed <triembed@triembed.org> wrote:
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                <div><div id="yiv0423261566"><div>
    On 2/28/19 8:54 AM, John Vaughters via TriEmbed wrote:<br clear="none">
    <blockquote type="cite">
      </blockquote></div><div><div class="yiv0423261566ydpee6a3d58yahoo-style-wrap" style="">
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">> But I
              need to go a step further. To assign a name like "NW-FOO"
              to the XDS110 in the NW corner of my "test range" I'd need
              to interpose in Udev somehow so it could do the thing to
              determine which is which.</span></span><br clear="none">
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        <div style="">Right, so are you saying that you do not have
          unique serial #'s?. The technique described relies on specific
          devices with serial numbers, </div>
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    I'm struggling to understand what you mean exactly by serial number
    in this context. Does each USB interface chip (or emulation
    hardware) have a unique serial number along with the manufacturer ID
    and device ID that we see with lsusb? I just assumed they don't and
    it's up to me to extract a standard ID (such as can be programmed
    into the debug probes) or something ad hoc (e.g. with a custom
    Arduino boot loader recognizing a "gimme your UID" command).<br clear="none">
    <br clear="none">
    I went backwards from you, spending about 10 years with Debian
    Stable before going to the dark side with Ubuntu 13. I regret that,
    but am afraid some key tool my work depends on simply won't play
    with what was a solid rock of reliability. Maybe I should grease up
    VirtualBox and see if I could reverse course.<br clear="none">
    -Pete<br clear="none">
    <blockquote type="cite">
      <div class="yiv0423261566ydpee6a3d58yahoo-style-wrap" style="">
        <div style="">so if you have to change an Arduino Nano out for
          instance, you would also need to change the rule to use the
          new serial number. UDEV is extremely flexible and I haven't
          even touched the surface of it, so if you write more generic
          rules to just capture Arduino vs XYX, then I am sure you could
          find a rule to increment your naming. I used this technique to
          utilize the serial number to always connect to a specific
          name. It worked quite well for fixing reconnects where it
          would normally increment. However, it still did not fix just
          plain disconnects common in USB. I am not a fan of the USB
          software layer and I absolutely despise its physical
          connections. Having said all that I still use it in many ways,
          I have to, it's all there is for many things. And this
          solution described with UDEV and serial #'s actually worked
          quite well at solving the vast majority of issues and was
          quite stable. Probably fine for non-critical uses.</div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><br clear="none">
            </span></span></div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><span>Example
                FTDI Serial #</span></span></span></div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><span><br clear="none">
              </span></span></span></div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><span>ATTRS{serial}=="A600G5OZ"</span><br clear="none">
            </span></span></div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><span><br clear="none">
              </span></span></span></div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><span><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">>I regret going with Ubuntu
                    18.04 </span></span><br clear="none">
              </span></span></span></div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><span><br clear="none">
              </span></span></span></div>
        <div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><span><span style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><span>You
                are making me feel better about keeping my Ubuntu 16 or
                is it 14? Anyway, I am done with Ubuntu. it drives me
                crazy in the same way that windows does, by making
                decisions for you and assuming the user needs to be
                probed constantly to act. I have always been a RedHat
                person, but thanks to Rpi and many other embedded
                devices, I am now a HUGE fan of Debian. I will not be
                going to Ubuntu for new installs unless I am setting it
                up for non-technical users, then Ubuntu is still the #1
                go to. For me though, Ubuntu just annoys the crap out of
                me in so many ways. The problem with RedHat (Centos) is
                it just doesn't keep up to date for newer software, so I
                have to use something else for that. It has been Ubuntu,
                but now it's Debian.</span></span></span></div>
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          <div> On Wednesday, February 27, 2019, 8:55:07 PM EST, Pete
            Soper via TriEmbed <a rel="nofollow" shape="rect" class="yiv0423261566moz-txt-link-rfc2396E" ymailto="mailto:triembed@triembed.org" target="_blank" href="mailto:triembed@triembed.org"><triembed@triembed.org></a> wrote: </div>
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            <div id="yiv0423261566">
              <div> On 2/27/19 7:16 PM, John Vaughters via TriEmbed
                wrote:<br clear="none">
                <blockquote type="cite"> </blockquote>
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                  <div>Pete,</div>
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                  <div>If you are using the same USB devices all the
                    time and do not expect changes, consider doing udev
                    rules. Below is an article I wrote about it.
                    Basically it recognizes your USB device based on
                    certain ID's and you can name the device whatever
                    you want. As far as communicating, "expect" scripts
                    is as good as any tool I can think of. The only
                    thing that is probably </div>
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                Thanks. That's a nice how-to and will make it easy to
                differentiate between the TI XDS110 debug probes and
                Beaglebone boards that both manifest as /dev/ttyACMn and
                between instances of custom devices and the Arduino
                Nano's I'm using to run some motors that both manifest
                as /dev/ttyUSBn. But I need to go a step further. To
                assign a name like "NW-FOO" to the XDS110 in the NW
                corner of my "test range" I'd need to interpose in Udev
                somehow so it could do the thing to determine which is
                which. For the XDS110 there's a TI program that (if you
                repeat it enough times: flaky as heck) puts out strings
                including the ID string, but for the custom device I
                need to use expect to poke something into the port and
                get back the ID (and same for the Arduino motor
                controllers). <br clear="none">
                <br clear="none">
                So the question is whether there's a hook mechanism with
                Udev that would allow running a command as a side effect
                of the device's detection and name assignment under
                /dev. Especially if that could be run as root I could
                create the symbolic link and properly set its group id.
                Or maybe the invoked program/script could simply rename
                the device after it's probed it?<br clear="none">
                <br clear="none">
                I agree that USB has got further to go. I regret going
                with Ubuntu 18.04 for my latest PC 'cause Code Composer
                Studio seems to be much less able to manage the debug
                probes than when it's running on 16.04. Over on the
                TriLUG list there's been griping about 18.04 having
                regressions and that matches my experience.<br clear="none">
                <br clear="none">
                -Pete<br clear="none">
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                    <div>better is Tera-Term, but that is strictly
                      windows. It is quite good though and I wrote a
                      tool to run scripts to 300 edge routers using
                      Tera-Term. One thing I used to do is use "socat"
                      to send the serial device to a raw TCP port and
                      communicate over the network. In general I do
                      everything I can to not communicate to USB devices
                      due to their constant connection issues. I prefer
                      using UART if possible. </div>
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                    <div>Good Luck,</div>
                    <div><br clear="none">
                    </div>
                    <div>John Vaughters</div>
                    <div><br clear="none">
                    </div>
                    <div><a rel="nofollow" shape="rect" class="yiv0423261566enhancr_card_1654028628" target="_blank" href="http://combustory.com/wiki/index.php/Arduino_Communications_Device_Naming_with_udev">Arduino Communications
                        Device Naming with udev - Combustory</a><br clear="none">
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                                                <h2 class="yiv0423261566ydp4a2558ccard-title" style="font-size:14px;line-height:19px;margin:0px 0px 6px;font-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif;color:rgb(38,                                                   40, 42);">Arduino
                                                  Communications Device
                                                  Naming with udev -
                                                  Combustory</h2>
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                  <div class="yiv0423261566yahoo_quoted" id="yiv0423261566yahoo_quoted_1531166218">
                    <div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
                      <div> On Wednesday, February 27, 2019, 4:41:50 PM
                        EST, Pete Soper via TriEmbed <a rel="nofollow" shape="rect" class="yiv0423261566moz-txt-link-rfc2396E" ymailto="mailto:triembed@triembed.org" target="_blank" href="mailto:triembed@triembed.org"><triembed@triembed.org></a>
                        wrote: </div>
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                      <div>
                        <div dir="ltr">It's been many years since I used
                          the Unix "expect" command but that was <br clear="none">
                        </div>
                        <div dir="ltr">the industrial strength solution
                          for automated interaction with a serial <br clear="none">
                        </div>
                        <div dir="ltr">connection such as via ssh where
                          you specify a "script" of "this is <br clear="none">
                        </div>
                        <div dir="ltr">sent, this is what's received
                          back", interactions and the logic to take <br clear="none">
                        </div>
                        <div dir="ltr">actions based on the interaction
                          details. What's out there now that I <br clear="none">
                        </div>
                        <div dir="ltr">should be using, or is this still
                          the best way to go? My host <br clear="none">
                        </div>
                        <div dir="ltr">environment choices are Linux or
                          Cygwin (inside a VM).<br clear="none">
                        </div>
                        <div dir="ltr"><br clear="none">
                        </div>
                        <div dir="ltr">My situation is that I have three
                          or four flavors of device that I need <br clear="none">
                        </div>
                        <div dir="ltr">to connect to with either ssh or
                          a terminal emulator where a script of <br clear="none">
                        </div>
                        <div dir="ltr">some sort dictates what I have to
                          send and what I expect back. This, in <br clear="none">
                        </div>
                        <div dir="ltr">turn, is to deal with the musical
                          chair situation with USB connections <br clear="none">
                        </div>
                        <div dir="ltr">such as when I get intermittent
                          electrical service from Duke Energy (at <br clear="none">
                        </div>
                        <div dir="ltr">no extra cost!) I've got an
                          automated test system where there are, for <br clear="none">
                        </div>
                        <div dir="ltr">example,
                          /dev/ttyACM{0,1,2,3,4,5,6,7},
                          /dev/USB{0,1,2,3}, etc, and I <br clear="none">
                        </div>
                        <div dir="ltr">need to establish and keep fresh
                          meaninfully named symlinks that get <br clear="none">
                        </div>
                        <div dir="ltr">associated with the right devices
                          assigned randomly by system startups, <br clear="none">
                        </div>
                        <div dir="ltr">being forced to
                          unconnect/reconnect cables, etc.<br clear="none">
                        </div>
                        <div dir="ltr"><br clear="none">
                        </div>
                        <div dir="ltr">.<br clear="none">
                        </div>
                        <div dir="ltr">Thanks,<br clear="none">
                        </div>
                        <div dir="ltr">Pete<br clear="none">
                        </div>
                        <div dir="ltr"><br clear="none">
                        </div>
                        <div dir="ltr"><br clear="none">
                        </div>
                        <div dir="ltr">_______________________________________________<br clear="none">
                        </div>
                        <div dir="ltr">Triangle, NC Embedded Computing
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