Access denied to /dev/ttyUSB0
Jenny Murphy
jenny.murphy at episensor.com
Fri Dec 9 21:24:37 UTC 2016
Hi,
Just to catch up on the latest here.
Now I am migrating to Ubuntu 16.04, having previously being running on
15.04.
I used to do :
sudo snappy hw-assign SNAP /dev/ttyUSB0.
So now I need to do :
snap connect SNAP:serial-port ubuntu-core:serial-port-1
replacing serial-port with /dev/ttyUSB0 ? What is serial-port-1 then?
Thanks.
On 8 September 2016 at 00:34, Gustavo Niemeyer <
gustavo.niemeyer at canonical.com> wrote:
> We've just been polishing this process in the last couple of weeks.
>
> You just need to ask for a serial-port plug in your snap.
>
> There's a step missing for that to work well, but that's on our end. We
> need to expose serial-port slots in the gadget or core for serial-port-0
> (S0) and serial-port-1 (S1) if those are available. In the near future,
> these slots will show up automatically based on hotplug support.
>
> Then, you can run something like:
>
> snap connect yoursnap:serial-port ubuntu-core:serial-port-1
>
>
>
> On Wed, Sep 7, 2016 at 8:29 PM, Enrique Hernández Bello <ehbello at gmail.com
> > wrote:
>
>> Hello,
>>
>> taking advantage of this thread, what is the right way to grant access
>> of a /dev/ttyS0 to our snap in Ubuntu Core 16?
>>
>> Regards.
>>
>> 2016-09-07 15:26 GMT+01:00 Simon Fels <simon.fels at canonical.com>:
>> > On 07.09.2016 15:05, Loïc Minier wrote:
>> >> Hi,
>> >>
>> >> You need to use:
>> >>
>> >> plugs: [serial-port]
>> >>
>> >> In your snapcraft.yaml; then you also have to connect your snap to that
>> >> interface manually as it's not autoconnected; check "snap interfaces"
>> to
>> >> see which plugs and slots are connected.
>> >
>> > That doesn't work anymore. There is no implicit slot for serial-port.
>> > Right now the only option to get access to serial ports is via defining
>> > a slot on a gadget snap with either a USB product/vendor id pair or a
>> > absolute path to the serial node which then the snap can connect to and
>> > it will only get access to that particular serial port.
>> >
>> > You can put something like
>> >
>> > slots:
>> > my-usb-serial-device:
>> > interface: serial-port
>> > product-id: 0x0
>> > vendor-id: 0x0
>> >
>> > into your gadget snap and then connect both the snap and gadget together
>> > so your app gets access to that serial node.
>> >
>> > In a system where no gadget exists you currently don't get access to
>> > serial nodes. We need to implement hotplut support to make this slots
>> > automatically exported for those devices. Not sure for when this is on
>> > the list.
>> >
>> > regards,
>> > Simon
>> >
>> >>
>> >>
>> >> On Wed, Sep 7, 2016 at 4:00 PM, Jenny Murphy <
>> jenny.murphy at episensor.com
>> >> <mailto:jenny.murphy at episensor.com>> wrote:
>> >>
>> >> Hi,
>> >> I solved the previous issue regarding the use of the RXTX java
>> >> library and the application is loading and running without errors.
>> >> However my java code isn't detecting the port, it should be able to
>> >> see /dev/ttyUSB0.
>> >>
>> >> In the dmesg log I see the following errors :
>> >>
>> >> [101043.875139] usb 1-2: new full-speed USB device number 7 using
>> >> xhci_hcd
>> >> [101044.006418] usb 1-2: New USB device found, idVendor=10c4,
>> >> idProduct=ea60
>> >> [101044.006441] usb 1-2: New USB device strings: Mfr=1, Product=2,
>> >> SerialNumber=3
>> >> [101044.006456] usb 1-2: Product: CP2102 USB to UART Bridge
>> Controller
>> >> [101044.006470] usb 1-2: Manufacturer: Silicon Labs
>> >> [101044.006482] usb 1-2: SerialNumber: 0001
>> >> [101044.011589] cp210x 1-2:1.0: cp210x converter detected
>> >> [101044.012037] usb 1-2: cp210x converter now attached to ttyUSB0
>> >>
>> >> [101098.191960] audit_printk_skb: 258 callbacks suppressed
>> >>
>> >> [101098.191979] audit: type=1400 audit(1473254849.416:69078):
>> >> apparmor="DENIED" operation="open"
>> >> profile="gateway.sideload_main_IdNRFcRcGPGe" name="/dev/ttyUSB0"
>> >> pid=4875 comm="java" requested_mask="wr" denied_mask="wr" fsuid=0
>> ouid=0
>> >>
>> >>
>> >> Is there anyway to solve this. I am working on a Ubuntu 15.04
>> platform.
>> >>
>> >> Thanks again.
>> >>
>> >> --
>> >> *Jenny Murphy*
>> >> *EpiSensor, Georges Quay House, Georges Quay, Limerick, Ireland*
>> >> jenny.murphy at episensor.com <mailto:jenny.murphy at episensor.com> t
>> |
>> >> +353 (0) 61 512 511 <tel:%2B353%20%280%29%2061%20512%20511> w |
>> >> http://www.episensor.com <http://www.episensor.com/>
>> >>
>> >> --
>> >> Snapcraft mailing list
>> >> Snapcraft at lists.snapcraft.io <mailto:Snapcraft at lists.snapcraft.io>
>> >> Modify settings or unsubscribe at:
>> >> https://lists.ubuntu.com/mailman/listinfo/snapcraft
>> >> <https://lists.ubuntu.com/mailman/listinfo/snapcraft>
>> >>
>> >>
>> >>
>> >>
>> >> --
>> >> - Loïc
>> >>
>> >>
>> >
>> >
>> > --
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>> an/listinfo/snapcraft
>>
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>
>
>
> --
> gustavo @ http://niemeyer.net
>
> --
> Snapcraft mailing list
> Snapcraft at lists.snapcraft.io
> Modify settings or unsubscribe at: https://lists.ubuntu.com/
> mailman/listinfo/snapcraft
>
>
--
*Jenny Murphy*
*EpiSensor, Georges Quay House, Georges Quay, Limerick, Ireland*
jenny.murphy at episensor.com <jenny.murphy at episensor.com> t | +353 (0) 61
512 511 w | http://www.episensor.com
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