<div dir="ltr">The gadget snap itself is pretty well explained on <a href="https://docs.ubuntu.com/core/en/guides/build-device/gadget">https://docs.ubuntu.com/core/en/guides/build-device/gadget</a> which also links to the official supported gadget snaps you can use for your experiements.<div><br></div><div>The slot definition can then be added to one of these as explained above.</div><div><br></div><div>Another option is that you download one of these gadget snaps from the store via the snap download command, modify it and then repack it and generate a new image via ubuntu-image out of it:</div><div><br></div><div>$ snap download pi3</div><div>$ unsquashfs pi3_*.snap</div><div># Do any modifications to squashfs-root/meta/snap.yaml</div><div>$ snapcraft snap squashfs-root</div><div># Now you have a new .snap file snapcraft generated for you</div><div>$ ubuntu-image ... --extra-snaps my-gadget.snap ... my-model.assert</div><div><br></div><div>Hope that helps.</div><div><br></div><div>regards,</div><div>Simon</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 17, 2017 at 10:06 PM, Mritunjai Singh <span dir="ltr"><<a href="mailto:mrsingh@ssni.com" target="_blank">mrsingh@ssni.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div lang="EN-US" link="blue" vlink="purple"> <div class="m_6122031550372778439WordSection1"> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Can anyone please guide me how to start writing gadget snap which gives me access to serial port interface on my Raspberry Pi board and x86_64 ubuntu machine. <u></u><u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Mritunjai<u></u><u></u></span></p> <p class="MsoNormal"><a name="m_6122031550372778439__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></a></p> <span></span> <div> <div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"> <p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Mritunjai Singh <br> <b>Sent:</b> Thursday, January 12, 2017 10:06 AM<br> <b>To:</b> 'Snapcraft' <<a href="mailto:snapcraft@lists.snapcraft.io" target="_blank">snapcraft@lists.snapcraft.io</a>><br> <b>Subject:</b> RE: Serial Port Plug/Interface issue with Ubuntu-core 16.04 (#2557)<u></u><u></u></span></p> </div> </div><span class=""> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">@Simon Fels</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">, thanks for the pointer. It would be great if you can further guide me writing the gadget snap. I have a Ubuntu x86_64 machine(VM) to which I will be connecting our RF Mesh network card through USB. The network card connects over serial and exposes a /dev/ttys0 port to work with. So do I need to write gadget snap for my network card or for my Ubuntu machine on which I have already installed snapcraft. <u></u><u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Please guide and do let me know should you require any further information.<u></u><u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Mritunjai <u></u><u></u></span></p> <p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p> <p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <a href="mailto:snapcraft-bounces@lists.snapcraft.io" target="_blank">snapcraft-bounces@lists.<wbr>snapcraft.io</a> [<a href="mailto:snapcraft-bounces@lists.snapcraft.io" target="_blank">mailto:snapcraft-bounces@<wbr>lists.snapcraft.io</a>] <b>On Behalf Of </b>Simon Fels<br> <b>Sent:</b> Thursday, January 12, 2017 12:58 AM<br> <b>To:</b> Snapcraft <<a href="mailto:snapcraft@lists.snapcraft.io" target="_blank">snapcraft@lists.snapcraft.io</a>><br> <b>Subject:</b> Re: Serial Port Plug/Interface issue with Ubuntu-core 16.04 (#2557)<u></u><u></u></span></p> <p class="MsoNormal"><u></u> <u></u></p> </span><div> <p class="MsoNormal">You can add a serial port slot to a gadget snap.yaml like this:<u></u><u></u></p><div><div class="h5"> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> <div> <p class="MsoNormal">ttyS4:<u></u><u></u></p> </div> <div> <p class="MsoNormal"> interface: serial-port<u></u><u></u></p> </div> <div> <p class="MsoNormal"> path: /dev/ttyS4<u></u><u></u></p> </div> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> <div> <p class="MsoNormal">This only applies to static serial port nodes. If you have one provided by an USB device you have to user a slightly different slot definition which refers the USB product/vendor id of your USB device:<u></u><u></u></p> </div> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> <div> <p class="MsoNormal">my-usb-serial:<u></u><u></u></p> </div> <div> <p class="MsoNormal"> interface: serial-port<u></u><u></u></p> </div> <div> <p class="MsoNormal"> usb-product: 0x1111<u></u><u></u></p> </div> <div> <p class="MsoNormal"> usb-vendor: 0x2222<u></u><u></u></p> </div> <div> <p class="MsoNormal"> path: /dev/my-usb-serial-port<u></u><u></u></p> </div> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> <div> <p class="MsoNormal">With the path attribute you can select a static path for the serial port node which your snap then gets access to once you connected the plug and the slot. The path needs to start with /dev/ and afterwards you're free to select a free node name. Internally the interface implementation will link the right /dev/ttyUSB* node to the specified path.<u></u><u></u></p> </div> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> <div> <p class="MsoNormal">Please note that you can define such a slot only on a gadget snap! So if you don't have your own gadget snap today, you need to create one for your device in order to get access to the serial port.<u></u><u></u></p> </div> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> <div> <p class="MsoNormal">I hope that helps.<u></u><u></u></p> </div> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> <div> <p class="MsoNormal">regards,<u></u><u></u></p> </div> <div> <p class="MsoNormal">Simon<u></u><u></u></p> </div> <div> <p class="MsoNormal"><u></u> <u></u></p> </div> </div></div></div><div><div class="h5"> <div> <p class="MsoNormal"><u></u> <u></u></p> <div> <p class="MsoNormal">On Wed, Jan 11, 2017 at 7:37 PM, Oliver Grawert <<a href="mailto:ogra@ubuntu.com" target="_blank">ogra@ubuntu.com</a>> wrote:<u></u><u></u></p> <blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt"> <p class="MsoNormal" style="margin-bottom:12.0pt">hi,<br> Am Mittwoch, den 11.01.2017, 17:59 +0000 schrieb Mritunjai Singh:<br> > Hi All,<br> > <br> > Kindly refer to: <a href="https://github.com/snapcore/snapd/issues/2557" target="_blank"> https://github.com/snapcore/<wbr>snapd/issues/2557</a><br> > <br> > We are trying to get a head start on Core Snappy working with our RF<br> > Mesh network card. It connects over serial and needs to be available<br> > at boot. We first tried this using snap approach but due to missing<br> > hotplugging serial-interface in current(latest) version of snapcraft,<br> > serial i/o requests are being denied even if the snap has the<br> > permission to use serial port.<br> > <br> > We have been suggested the gadget snap approach in order to expose<br> > /dev/ttyS0 to the serial port interface for tunnccd snap to access<br> > it. It would be very helpful if someone can point me to the working<br> > example of a gadget snap with access to serial interface or any end<br> > to end gadget snap example and its build steps.<br> <br> note that all our gadgets offer a console on serial by default, if you<br> drive some external device via serial you might want to drop this<br> console tty option. <br> <br> all our official gadgets are under <a href="https://github.com/snapcore/" target="_blank">https://github.com/<wbr>snapcore/</a> ..<br> namely the pi2-gadget, pi3-gadget, pc-gadget and dragonboard-gadget<br> sub-trees if you want to take a look ...<br> <br> ciao<br> oli<br> --<br> Snapcraft mailing list<br> <a href="mailto:Snapcraft@lists.snapcraft.io" target="_blank">Snapcraft@lists.snapcraft.io</a><br> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/snapcraft" target="_blank"> https://lists.ubuntu.com/<wbr>mailman/listinfo/snapcraft</a><u></u><u></u></p> </blockquote> </div> <p class="MsoNormal"><u></u> <u></u></p> </div> </div></div></div> </div> <br>--<br> Snapcraft mailing list<br> <a href="mailto:Snapcraft@lists.snapcraft.io">Snapcraft@lists.snapcraft.io</a><br> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/snapcraft" rel="noreferrer" target="_blank">https://lists.ubuntu.com/<wbr>mailman/listinfo/snapcraft</a><br> <br></blockquote></div><br></div>