Thanks @yab or the reference. I hadn’t seen that thread until now. I’ve read it through and updated to 2.5.7. Ironically, I’m not getting any errors after updating java and openHAB, but this particular issue persists.
After a few more tests it seems to be very specific; my echo devices do not report LastVoiceCommand if the command relates to any potential smartphone devices, even if they don’t exist in your system. For example, previously I was testing lights, lamps etc. (which are present in my system) but the same thing happens when I ask alexa to “open the blinds” (which are not in my system). This does not get reported at all.
I’m starting to think that this is a security-focused update to the binding or potentially on the alexa server. Perhaps I need to start a new thread or post on the one you linked to.
Can anyone else verify that the same issue is happening on their setup? To reiterate, most commands are reported by LVC, but not if they relate to smart home devices.
Edit: This appears to be another issue, not related to the websocket error. Thread started here.