Does anybody know what is a source of incompatibility between firmware v. 1.3 and latest zwave js ui? New features or bug on either of the sides?
The answer I got from Zooz:
The SDK library from Silicon Labs, provider of the Z-Wave chip is affected by the bug - controller lockup issues. This has started on SDK 7.19.x and our ZST39 was already affected.
Since then Zooz skipped many updates SDK from Silicon Labs since July 2023, but finally, we have decided to update our stick to 1.30 firmware with the latest SDK 7.21.3 - since there are many other bug fixes and NVM backup should work as expected now. However, the controller lockup issue is still existing on that firmware.
It is currently unclear why in some cases it showing worse symptoms on HA than 1.20. Generally, there should be fewer issues. We are still investigating it since our firmware was released only 10 days ago. At this time is unclear if this is an SDK issue, Zooz custom firmware issue, or HA/Z-Wave JS issue.
Anyway, our firmware was made that way so that you can downgrade it to 1.20. We would recommend a PC Controller from Silicon Labs for that because HA/Z-Wave JS has another issue with updating/wongrading firmware on the stick. In some rare cases, the stick can be even bricked.
Also, our Z-Box hub is based on Fibaro Home Center 3 Lite with SDK 7.21.0 and has also controller lockup issue, however, we are not seeing that many issues like HA users.