Starting a new topic instead of hijacking this one: Is Z-Wave / Hubitat really suitable for real time lighting?
I have a brand new Hubitat C7 deployment with about a dozen Zooz Zen 7x dimmers and switches. Z-Wave control of the devices is unreliable to the point where I cannot use it for any real time scenario.
In troubleshooting, I've found that issuing simple on/off commands from the hub (device interface view) works very reliably when I pause a few seconds between commands. If I spam on/off quickly enough, it's as if the system becomes overloaded: The device stops responding, or behaves erratically over the next 30 seconds or so, until things settle down. The Hubitat logs will often show a flood of repetitive status events (e.g. "Dimmer was turned off"), exceeding the actual number of commands issued, during this overloaded state.
The issue is exacerbated when trying to operate groups of devices. Toggling on/off on a group of four devices just once is usually enough to overload the system.
Finally, it's not just an issue "spamming" commands. Sometimes Z-Wave commands are just plain laggy, and a device doesn't respond for several seconds. This seems to happen most often when the system has been idle for a while.
I've noticed that, while the system is in the "overloaded" state, I can still control non- Z-Wave devices (Hue Bridge) from the Hubitat with excellent response times. This suggests that it's not the hub itself is overloaded; rather, it seems like an issue with my Z-Wave network or devices.
I'm looking for troubleshooting suggestions on how to proceed here: How to gather diagnostic logs to pinpoint any potential root causes, how to interpret the information on the Z-Wave Details page, anything. I've already updated the Z-Wave Firmware on the Hubitat and performed a Repair, so I'm really not sure what else to try.
As a next step, I'll try relocating the hub to a more central location just to see whether it makes any difference, though I doubt the wife will approve a Hubitat sitting on the mantle But it's currently located nearby a Hue and Lutron Bridge, which have both worked flawlessly for central control at that location for several years. (I understand Z-Wave is a different protocol, but it doesn't instill confidence in the technology if it's going to be that sensitive to the physical surroundings and home layout... we'll see...)