This article was originally posted on Medium. As I am removing my Medium articles, this will be the archive for this content. Originally written on September 8, 2017. TL;DR Version: Make sure your iOS devices can connect to the HomeKit Devices on port 80 and 443, and replicate mDNS from VLAN/Subnet to VLAN/Subnet with Avahi. So, you’ve setup multiple VLANs and SSIDs at home, you’re keeping all those Internet Connected toasters away from the LAN where your crown jewels sit.