'No responding' message immediately after connecting EVVR Smart Relay to HomeKit

It sounds like your EVVR relays are getting as far as connecting to your Wi-Fi, but HomeKit isn’t able to talk to them — which usually means it’s a network discovery issue, not a device failure. HomeKit devices rely on Bonjour (mDNS) and, for many modern devices, Thread or HomeKit Secure Router features. If Bonjour packets aren’t flowing cleanly between your iPhone/iPad and the relay, you’ll see exactly what you’re describing: “No Response” in the Home app even though the device is online.

Here’s what I’d suggest checking step-by-step:

1. If your router has “AP Isolation,” “Client Isolation,” or separate VLANs/guest networks enabled, disable those for now. HomeKit devices must be on the same logical subnet as your controlling device.
2. Many IoT devices (including EVVR) only communicate over 2.4 GHz. Ensure your iPhone is also connected to 2.4 GHz at least during setup. Some mesh systems merge SSIDs but still segment traffic — you may need to temporarily disable band steering.
3. On some routers (especially Ubiquiti, Synology, or ISP-provided units), there’s a multicast filtering or “Block LAN to WLAN multicast/broadcast” setting. Make sure multicast is allowed between wireless and wired devices.
4. Make sure you have an active HomeKit hub (Apple TV, HomePod, or iPad set as hub) and that it shows as “Connected” in Home Settings. Sometimes hubs get stuck and need a reboot.
5. If possible, connect both your phone and one relay to a mobile hotspot. If it works there, it’s definitely your home network config, not the relay or iOS.

Finally, you can test mDNS is working properly on your network by doing the following:

1. Open Terminal on your Mac.
2. Run this command to list all mDNS services: dns-sd -B _hap._tcp
3. This will scan for all HomeKit Accessory Protocol devices currently advertising themselves on your LAN.
4. Watch the output for something that looks like your EVVR relay. The service name is often descriptive (e.g., *EVVR Smart Relay* or something close). If you see it listed, then Bonjour/mDNS is at least advertising the device. If you don’t see it, then your network is blocking multicast traffic.
5. To inspect a specific device, copy its service name from step 4 and run: dns-sd -L "Device Name" _hap._tcp This will return its IP address, port, and TXT records (including the HomeKit setup ID). If you can see the device here but still get “No Response” in HomeKit, the issue is likely at the hub or HomeKit authentication layer, not discovery.

If this test fails to find the relay, that means multicast is not flowing between your phone/Mac and the relay — usually fixed by tweaking router/AP settings (disabling client isolation, ensuring mDNS forwarding is enabled, allowing 224.0.0.x traffic).