"Matter over WiFi" + Matter Server Won't Retain Configuration

Configuration Matter/Thread
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21

I don’t know if this is related but I’m having a similar issue trying to setup a P110M plug using matter.

My setup is different in that I have HA running in one VLAN and the plug in another. Therefore I need to have mDNS discovery via Avahi to be broadcast between VLANs and also have odhcpd on the router sending announcements for ipv6 IP prefixes for each VLAN, so each the ipv6 addresses are segmented like my ipv4 ones.

I am no expert with this sort of setup so I was wondering if anyone has done something similar? AFAIK this HA matter add-on only works with ipv6 - even if in the HA UI I can see the ipv4 address, but you can’t interact with the plug.

Given that it only works over ipv6, and lots of people will split off there iot devices into different VLANS, should this not be easier?

Does anyone know if I have made a mistake in my reasoning or if there is documentation about this?

22

There are/have-been/continue-to-be several topics on this, and I’m sure many will chime in, but I think I can summarize by saying that a few have had success doing this (with many not), and it can still be problematic, others have had much better success putting HA on both VLANs, but the general rule is to run HA on a flat network.

I think I can probably give you an example. The P110M appears to be a WiFi based Matter device. Even though your Avahi may relay mDNS advertisements, some Matter/WiFi only mDNS advertise their link-local addresses. So HA gets this mDNS and tries to make contact with the device and can’t because that link-local address does not exist on the HA-VLAN.