Question about / e / versions

[AnotherElk]

@dln949

The first part of the system version – “0.15” in my case – is that an / e / version number?

Yes. Release notes are here …

https://gitlab.e.foundation/e/os/releases/-/releases

@dln949

The second part of the system version - “o” in my case – does that mean Android version Oreo?

Yes.
“p” would be Android Pie (9), “q” would be Android Q (10).

@dln949

Is Android version Oreo the same as what shows on my phone as “Android version 8.1.0”?

Yes.

@dln949

For any supported device, will / e / have – for example – a version 0.15 for Oreo, and then a version 0.16 for Oreo? Or, is 0.15 matched with just Oreo, and version 0.16 is matched with just Pie (or Q)?

A particular /e/ version can get built using different Android versions as a base, so the /e/ version doesn’t necessarily correlate to only one Android version automatically. You can see that in the release notes.
What’s available on different devices then depends on whatever works and gets support on a particular device.

@dln949

Can I expect the update from 0.15 to 0.16 for this device to come from / e / over the air?

If the update stays within the same major Android version, yes.
In your case … If there is a 0.16-o, it should come OTA (I don’t have your device).

@dln949

Can I expect the update from Oreo to Pie or Q for this device to come from / e / over the air, or do I need to download stuff and install it?

Currently the Updater doesn’t support OTA upgrades to a new major Android version, documentation about the manual process can be found on https://doc.e.foundation/devices/, for your device it’s here … https://doc.e.foundation/devices/star2lte/upgrade.
But work is being done on the Updater to enable OTA upgrades in the future.