I also got version 9.5.45 through support, but nothing changed.
After inspection of the device with the matter server add-on, I couldn’t find the cluster for Electrical Power Measurement and Electrical Energy Measurement.
Meross got back to me and confirmed that energy management isn’t part of firmware version 9.5.45 but will be implemented in the next version which should be out in the next weeks.
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Meross pushed a new version to me and I can report that the plug finally reports energy data over matter.
I don’t know if this is generally available.
I’m glad this update is finally here and meross followed their word.
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What firmware version are you using? And the update was pushed through the app? Or did you somehow manually installed it?
My devices are in version 9.5.50.
I think they only pushed this on my devices due to my contact with support about this.
I haven’t found any problems with it right now and I hope they will start the rollout in a few days/weeks.
How is the reporting? Is it “smart” and will report meaningful changes quickly (like if you turn on or off the appliance that is connected to the plug) or it’s just a “dumb” periodic reporting every X time? Does it flood the controller with reports?
Reaction time seems fairly quick to me. Not instant but sufficient for automations.
Could you provide me a way to check for controller spamming?
I can compare the energy measurement to a tapo p110 and give you the results.
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Thanks, don’t worry, it was just out of curiosity, I was assuming it was easy to see a power vs time graph or a list of the measurements received.
I don’t have plugs with energy monitoring in HA so I’m not sure where to see it. Maybe in the History or the Logbook? Looking at the Matter Server logs in “verbose” level settings is another option but that’s cumbersome.
I asked Meross about Matter 1.3 support on the UK version, this is the response.
I just remembered last night that I bought these a year ago now for the Christmas lights, and they’ve still not been of use to me. Maybe next year.
For now 9.3.26 seems to be the latest for me, I can’t wait for the new one to come out!
As I wanted to get started with Matter, I decided to try it out and get an MSS315 myself. After some hustles for the setup, I managed to get it connected to HA. Is there some place, where I can look up the Matter protocol version? All the diagnostic JSON files give no indication.
I only have two entities (switch.smart_plug_mini and button.smart_plug_mini_identifizieren (=identify)), so I guess it is not working on Matter 1.3 yet, right? I would expect to see at least at third entity for current power consumption (if not a forth one for cumulated energy).
I did a firmware upgrade to 9.3.26 via the Meross app, now I am told that this is the newest version.
System Info
I am running HAOS on an Odroid M1 with these versions:
"home_assistant": {
"installation_type": "Home Assistant OS",
"version": "2024.12.0",
"dev": false,
"hassio": true,
"virtualenv": false,
"python_version": "3.13.0",
"docker": true,
"arch": "aarch64",
"timezone": "Europe/Berlin",
"os_name": "Linux",
"os_version": "6.6.63-haos",
"supervisor": "2024.11.4",
"host_os": "Home Assistant OS 14.0",
"docker_version": "27.2.0",
"chassis": "embedded",
"run_as_root": true
},
The update is for matter 1.3 support is not widely released right now. You just have to wait a little more. 9.5.50 and upwards should support matter 1.3
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I see, thanks for clarification.
Just to get this right: When the update is available, I need to upgrade the firmware through the Meross app. Then I should automatically see additional entities in HA, right?
I dont know if they appear after the update. I re-added the devices after the update.
I’ve just been emailed from meross support saying they’d just need the mac of my mss315 and then they’d enable me for the firmware update that supports energy reporting via matter.
So, if you’ve got an mss315 and would like the new firmware because you’re stuck on <9.4.50 (mine is on 9.4.45), maybe write to [email protected] 
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Thanks for the tip, I emailed them yesterday and got the 9.5.50 update for the MSS315.
The device got a new Endpoint with the electrical power measurement clusters:
On Home Assistant side I had to re-interview the device so it got the new energy measurement entities
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Now that there are more users with the update, how is the reporting? Does it report meaningful changes fast? Does it report periodically? Is it too chatty / spammy?
Power seems to be updated every 30s, energy every 60s. I’d say reasonable periods chosen.
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Which variant are you guys using that they gave you the power monitoring update for?
I know the EU plug update was in beta, from what they told me last time I spoke to them, there’s no UK update yet and they didn’t have a timeline.
Thanks, was wondering if they were able to report meaningful changes fast, like turning on or off a TV connected to the smart plug to run some automations. If it’s a fixed period, the automation may take up to half a minute to run.
Matter specification explicitly talks about meaningful changes so it can report them fast while not flooding the controller with “useless” reports. But that’s more work for vendors of course, a fixed reporting rate is easier to implement.