SMLight actually say that the EFR chip is better suited to be the Matter over Thread radio.
Indeed, but right now it doesn’t seem to work. Found some info on Reddit about that as well, I’ll flip it over to the EFR chip after the next FW upgrade maybe, but right now, its working fine with the CC chip.
I’m going to try your config tomorrow perhaps, will report back when I get the chance to try.
Are you using ZigBee on the device as well? I’ve been having issues with that side of it dropping out.
Why was this rule necessary? What rule was blocking the traffic before you added this Allow rule? I understand that the default for internal zone to internal zone is “allow all”, which I think would make your rule redundant. Am I wrong? Did you change the default?
BTW, I looked, and I have this rule:
Allow internal 224.0.0.251:5353 to internal *:*
I am guessing I added it based on advice in another post when I was struggling to make stuff work, and I honestly don’t know if it is even necessary. It’s strange that my rule restricts the source IP and port, and your rule restricts the target port. I guess I had better read up on multicast.
It was the advice from ChatGPT… Apparently the Unifi’s standard rules can block this traffic.
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@sparkydave Have you upgraded your UDM Pro to Zone Based Firewall?
I’m not seeing the same options in my UDM FW config.
My UDM is on Network version 9.5.21. It has both zone based and rule based options for the firewall creation.
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Had to activate the new zone based option, that got it going.
Just to post up an advisement for anyone that is looking into this thread as well:
If you have offline devices after updating to 2025.11.1 for Core and Supervisor of you HA instance with 8.1.1 build of Matter and if you do have a manual backup or autobackup from before the update to your instance to HA then do a restore of just the Matter addon, this will restore all devices back to an online state.
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So I got everything working, albeit on the second radio which is compatible with the older firmware.
Have adopted and managed a few devices now (mostly TP Link Kasa/Tapo devices) and they all work great, with no delay or impact. This is across about 2800sq feet and 3 floors (with the MR4U residing in the basement).