Tl;dr The newest Z-sticks need an adjustment with Silicon Laboratory “Silabs” Simplicity 5 to work in openHAB (OH), until an automatic fix can be included in a stable OH Z-wave binding. The procedure is outlined below:
Brief Context: Z-sticks are marketed by their chip (500, 700 and 800), but have different firmware (Silabs Development Kits (SDKs)). The latest SDK for a 500 chip is 6.x and has no issues with the OH Z-wave binding. The 700 and 800 chips use 7 series SDKs that support the Z-wave Long Range protocol (LR) but are backward compatible with “classic Z-wave”. The issue is the newest SDKs 7.21 (for 700 chip Z-sticks) and SDK 7.22 (for 800 chip Z-sticks) are shipped with 16-bit node IDs to support LR nodes IDs (256 to 4096). The OH Z-wave binding only supports “classic Z-wave” with 8-bit node IDs (1-232). Even without LR, 700 and 800 Z-sticks have performance benefits from faster chips and better range (just not LR).
Check first if this is your issue: Before going through the procedure have the Z-wave binding in debug. Look for a line like this. It should be in the response to the first message after the binding is loaded and controller found (TID 0?). If not 7.21 or 7.22, this is likely not your issue.
Got MessageGetVersion response. Version=Z-Wave 7.22, Library Type=7
Alternately review the screen shown below in the Silabs PC Controller your SDK version.
Before starting the procedure reset the Zstick and set the controller as SIS. <–Avoids an WARN message in OH
Procedure: Obtain the Simplicity Studio software. It is free but requires registration. IMO for Zwave networks of any size it is a valuable tool to remove zombie nodes, do firmware upgrades, evaluate network communication, etc.). The reference procedural outline is here for this issue. Plug your new Zstick into a USB port and start the program. Under tools, choose the PC Controller. From there follow the guide. The command to enter;
You can check for success with the Zniffer on the log file setup shown in the document
Stop Studio 5, remove Z-stick and put in your OH server. Delete any prior bridge/controller attempts and create a new bridge. Best to have the Z-wave binding in Debug before creating the controller/bridge, so if there is a problem you will have the data for a forum post. Go back to INFO log level once the controller is online.