I have migrated to 3.4.2 and I have the same issue
The problem here is we need to narrow the cause of the issue. If it works with onvif de ice manager but does not work with the binding then we need to use Wireshark to grab the traffic and compare what is different so we can make the change.
The history above shows a change was made and merged so now we need to diagnose again as it may be a second issue not related to the first one.
I also got the stream working (just copying your things file and it worked, so thanks for that), but the motion alarm is still not triggered. As a workaround I set up another pi with Motion which works pretty well indoors (the outdoor cameras have a lot of false alarms).
I control the motion-project via shell scripts in openhab. It does pretty much what I need.
I will try to recreate a dump with wireshark asap!
@matt1 I add a new issue on github with dump and log: [IpCamera] Tapo C310 is not supported · Issue #14738 · openhab/openhab-addons · GitHub
Regards.