The Home app displays "No Answer" for third-party devices through smart hubs (IKEA, Lutron), after running for a few minutes. The devices are still controllable in third-party applications.

Cupertino, October 6, 2021

I have a HomeKit network with an IKEA Trådfri hub and a Lutron Caséta smart hub. Both devices worked fine for a while, then I changed the routers and now they have stopped working. A kind of. If I restart the smart hubs or disconnect / reconnect the Ethernet cable, the devices respond by pressing the Home button for a few minutes before displaying "No Answer". At that time, all devices no longer respond. In the first minute after rebooting, the response is instantaneous. About 20-30 seconds before they stop responding, the devices "delay" by about 0.25 - 0.5 seconds behind my taps. Then he stops answering completely. All other devices connected to the HomeKit via Wi-Fi are fine (ringtones, lights, various accessories). I see both hubs in my router's device table - they have IP addresses - and they both respond to pings from anywhere on the network. If I open IKEA Smart Home or Lutron apps directly from my iPad or iPhone, I can control the lights and shadows very well. Based on this, we've reduced it to something that prevents HomeKit from communicating with hubs. I don't understand why HomeKit would work for a few minutes and then stop. I have HomePod and HomePod Mini in this network. Is thread a factor? Is there an IPv6 problem, a multicast problem, or something else?

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