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I'm having what seems to be the same issue. I was using the original hardware ISY and the Hue V2 node, then I recently upgraded to Polisy ISY and the Hue V3 node. Same before and after the upgrades. The Hue lights can't be controlled by the ISY after a power failure. I can mess with it and get it working again, usually by restarting the V3 Hue node and pulling down the nodes on the ISY.

Oddly, I pull the scene names and numbers from the Hue Rest API. The phone app also pulls the names from the hub, but orders them differently so without the API, I have no idea what I'll get when I set a scene on the Polisy node. I'm working around the lack of support for the "smart" stuff I got at Costco by capturing network traffic to the devices and playing back the command when I get a UDP message from the ISY network resource. I just pre-ordered the Matter board and remounted the Polisy in a high and central location, so I'm hoping things will get a lot easier in the near future. Smart stuff is sort of a mess of proprietary protocals with decent SDKs few and far between, requiring far too much hacking.

No problem, it's great and fast! I have a huge Insteon setup with Insteon switches controlling HUE bulbs and a lot of Network commands going out to custom audio software for announcements and scene sound effects. My biggest issue, after getting around the update bug, was not realizing I needed to install the trial portal to get the portal code to install on the polisy ISY. After that it was just restoring everything and hitting buttons to refresh stuff until things worked. I was using a mix of Network commands to the HUE hub and HUE node commands. While that worked when I was using two boxes with two IPs, that failed on the single Polisy box. I switched to using just the HUE node, which is somewhat lacking, it really needs to show the scene names. I'm up and running and everying is vastly more responsive. My only question now is when will more PG3 nodes show up for all the other smart stuff I have? Things like the Atomi string lights from Costco or the Amazon Air Quality monitor? It seems like I should just be happy everything is working so well and just wait to see if Matter takes over or Insteon recovers.

I'm a bit worried ISY on Polisy will be some work and won't solve my entire problem, especially if my loss of Hue lights was caused by the Polyglot Hue Node starting up before the Hue Hub was fully booted. What I think I really want is a power up delay for the Polyglot Nodes, so what they talk to has a chance to boot. Maybe just put a long sleep in the startup script or something.

Does that work? I mean both the ISY on Polisy and the ISY starting before the Polyglot?

When my power comes back on, it seems the Policy seems to boot too fast and I get the message ISY994 not found on network. If I reboot the polyglot all is fine. I checked it, because some Hue lights were not responding to ISY commands to the Hue node. Rebooting the polyglot fixed that and the error message. It seems like there should be a retry, or the delay option on the Policy. Or can someone recommend a device to delay power after a power outage?