Here is a list of resources to help you troubleshoot your Zooz ZST39 Z-Wave Long Range USB Radio Stick and navigate the documentation that’s already out there
We try our best to keep the Zooz Support Portal updated and continue adding helpful articles every day so take a look at the most popular docs first, there’s a good chance your question has already been answered!
I’m new to Home Automation. I have a Raspberry Pi 4 which I intend using with Home Assistant and my question is which is better as a network resource - the ZST39 USB stick or the ZAC93 GPIO Module?
Hi @AliGD, the ZST39 can be on an extension usb, so there is better flexibility if it needs to be moved for better signal. The ZAC93 is installed in the pinout. Both units have the same SDK, so there is no difference there. There is also a PoE option for the ZAC93 as well: https://tubeszb.com/product-category/z-wave/
Is that tubeszb product a self contained PoE box that allows the Z-wave controller to be installed anywhere? Or even a secondary controller to be installed setup in Home Assistant, to connect a secondary building? It looks like the listing is out of stock.
You guys should just make an official PoE network based Z-wave controller and sell it in thesmartesthouse Store or on Amazon.
Sorry for the late reply here but we checked at the source to make sure we describe the tubeszb product accurately. Here’s what they said: “The device is a standalone controller and can connect to HA/Z-Wave JS directly over the users home network (Ethernet) so if they have Ethernet to the secondary building it can connect back and work with the existing HA setup. It is possible to add multiple zwave instances to HA. But beyond the one set up through HA a second zwave-js instance is needed.”
Hope that helps answer the questions! While the kit looks to be sold out, you can still buy the standalone adapter and get the ZAC93 here.
ZST39 FAQ: the best place to start 
OTA Firmware Update Files: read all of the disclaimers carefully before applying an update to your device to avoid accidental bricking 
ZST39 Change Log: where we keep track of all the updates made to the hardware and software of the device.
ZST39 Specs: make sure this device is a good fit for your installation.