My app snap's plug is not auto-connected to my gadget snap's slot

[Kyle Fazzari]

I have a gadget snap with the following slot:

    slots:
        kobuki:
            interface: serial-port
            path: /dev/serial-port-kobuki
            usb-vendor: 0x0403
            usb-product: 0x6001

I have an app snap with the following plug:

    plugs:
        kobuki:
            interface: serial-port

Both of these are published on their respective stable channels. I put these together in a model definition like so:

    {
        [...]
        "gadget": "my-gadget-snap",
        "required-snaps": ["my-app-snap"]
    }

And build it into an image with ubuntu-image. However, when I boot that image, this interface is not automatically connected:

    $ snap interfaces
    Slot________________________Plug
    [...]
    my-gadget-snap:kobuki_______-
    -___________________________my-app-snap:kobuki

There seems to be no way to specify that this interface should be automatically connected. I figure this belongs in the gadget, but perhaps it belongs in the model definition itself, as that's where extra snaps are added via required-snaps.

[Gustavo Niemeyer (niemeyer)]

Yes, that feature is definitely coming somehow.

[Gustavo Niemeyer (niemeyer)]

Issue being discussed here:

https://forum.snapcraft.io/t/gadget-snap-has-no-way-to-define-auto-connection/94

[Ian Johnson (anonymouse67)]

If I understand correctly, this bug can probably closed now with the introduction of `connections` stanza in the gadget.yaml which does exactly this