Add NCM to networking configuration for OSX Catalina (10.15) compatibility

[vanvoljg]

This addresses the issue of getting the Xebow to connect to a Mac running Catalina, OSX 10.15. The fix adds an NCM function to the ConfigFS-based USB gadget that we set up to make everything work over one USB port.

This is dependent on PR #3 of nerves_system_keybow getting merged in, along with generation of a new release tag and Nerves artifact.

I went and left ECM in to increase compatibility, in case some hosts are unable to use the other modes.

@doughsay could you give it a whirl on your Mac again to make sure that my adding ECM back in didn't mess anything up?

It can always get taken out again, if it causes issues.

• Fix nerves_system_keybow dependency version

Fixes #90
Fixes #91

[amclain]

Exposing 3 ethernet endpoints to the host simultaneously feels excessive and brittle to me, but I'm ok moving forward with this as the next step considering it fixes incompatibility with a platform. Something to think about for the next iteration of the USB ethernet endpoints: What if rather than bonding the adapters in the device, check which adapters can communicate with the host and disable all of the ones that are not the preferred adapter. If we can listen for USB hotplug events we could also know when to enable all of the adapters when the device is plugged in, although we may be able to detect this in other ways as well.

[doughsay]

Exposing 3 ethernet endpoints to the host simultaneously feels excessive and brittle to me

I agree, it already annoys me that I have two interfaces that show up on linux, and one doesn't work. It always tries to re-connect, causing notification spam. And what happens if two work? If both connect successfully what happens?

What if rather than bonding the adapters in the device, check which adapters can communicate with the host and disable all of the ones that are not the preferred adapter

This would be amazing and nullify the concern above. But I'm not sure how to pull it off...

[doughsay]

run mix deps.get and check in the mix.lock changes

[doughsay]

@vanvoljg there are still some changes left in here that reverence usb2, but looks like you opted to remove ecm in the end?

[vanvoljg]

run mix deps.get and check in the mix.lock changes

I knew there was something I'd forgotten. Cheers.

@vanvoljg there are still some changes left in here that reverence usb2, but looks like you opted to remove ecm in the end?

Comment documentation? Fixed! Thanks for the reminder. Any other references to usb2 are for the HID device.

[doughsay]

🎉