I have set up what seems to be a basic Z-wave switch group. It is a set of 3 light switches (1x Inovelli Red Switch, 2x Inovelli Black Switches). When I turn on or off the group switch group it can take up to 10 seconds to respond and it's not uncommon for 1 or 2 of the switches to just never do the action. I setup the watchdog app and my general Z-wave responds times seem reasonable. Am I misunderstanding how to use groups, or is there something else I should be looking into?
Things I've Tried
- Excluded and re-included all switches
- Z-wave repair
- Reboot hub
- Enabled/disabled on/off optimization
- Tried enabling metering
What settings did you use for metering? Without knowing more, this is probably the most likely thing that would help you. (I've seen suggestions to start as low as 75 ms, but if you don't care, a few hundred or more would be better if anything.)
Some people also have bad luck with optimization, but as long as your devices always report their status back to the hub correctly (I've never seen this problem with the Inovelli switches/dimmers, nor do most modern Z-Wave devices have problems with this), then that shouldn't be a problem, either. If anything, it might help. But you won't know for sure unless you check your individual devices to see how they respond--or just leave it off and hope that, together with metering, the effect on your network will be minimal. (The issue at hand with both is that flooding the network with too many commands at the same time could be problematic.)
Also, this shouldn't be necessary unless your Z-Wave radio is truly hosted--a rare event nowadays (but ask those of us with early C-7s 
)--then a shutdown, complete with pulling power for at least 30 seconds or so, is the only way to restart that radio. It is not affected by a regular hub reboot. I wouldn't try this all the time, but once can't hurt. (Remember to always shutdown or restart politely from Settings--treat the hub like a computer.)
Finally, while it seems like you've tried to address possible Z-Wave network issues, it may still be worth looking at Settings > Z-Wave Details to see if you find anything odd. High PER, long average RTT, and low RSSI values (negative or especially "large" [in absolute terms] negative numbers) on any device are a few things you might want to look out for, though it's hard to objectively rule anything as "bad. Except "ghost nodes," I suppose--which could be anything missing a "device class" column entry, though anything missing a "device" (on Hubitat) probably isn't doing you anything either. Ghosts have been known to cause Z-Wave havoc on the C-7.
I initially tried 200ms without much luck on the metering. I'm working with a C-5 hub here. Nothing looks out of place in the Z-wave details.
I seem to be making some progress by updating the fw on the switches. The Red series switch was running fw v1.9 (v1.22 is the latest). That Red series switch is now behaving quickly and consistently with the default group settings. The two Black series switches were running 1.11. Fw updates on those seemed to fail, but they also seem to be behaving well now. I'll have to do a little more testing to see if the fw number I'm reading is just cached or something.
