The Meross ms600 Presence Sensor (firmware 9.4.25.1.8.2, hardware version 9.0.0, Signal strength is 100%) does not seem to work reliable and seems to have bugs.
If I include the ms600 with matter directy to HA it only gives lights and motion. I did not test this long.
Include ms600 in meross app and via “meross lan” integration to HA works better (german screenshot):
But the motion value is not reliable. I tried every sensitive setting in the Meross app, but “Sensor presence motion” changes randomly it seems. Changes in the app for sensitivity take up to a minute before they are visible in HA.
If I go in the room there are several possible scenarios:
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Sometimes it takes a few seconds before “motion” shows detected.
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Often when I walk into the room “motion” changes to “Erkannt” (detected) and a second later to “keine” (not detected), until I move again than it goes back to “detected”.
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When motion is “detected” and I move or another person comes into the room “motion” changes instantly to not detected until I move again.
I don’t even know how motion can change so fast from “not detected” to “detected” and back to “not detected” in a few seconds, because I set the time for “no detection” to 15 seconds or 30 seconds, so instant change to “not detected” should not be possible. It must be an error in the HA integration, or the device itself.
“Light” was shown at first. but changed to “not available” and stayed there.
I don’t know the meaning of “mth1-3” or the value for “presence”, and the meross website does not have any documentation about this.
In the meross app, the presence detection is the same. I can jump up and down directly in front of the sensor, but nothing changes, than a few seconds later when I stand still it detects motion, but goes to not detected two secondes later.
In comparison I have two “Everything Presence Lite” sensors and they work flawlessly, but I needed more presence sensors and the “EPL” are very expensive and not available at the moment anyway.
The ms600 seems to be a broken and useless device. So I bought the ms600 (because I have several Smart Plugs and a temperature sensor, these Meross devices work flawlessly), will probably return the MS600 unless someone here knows the magic to get the it to work bugfree.
It took me over 2 hours just to get it working right with the official app. Ended up having to use 2 different phones for different parts of the setup because of some obscure issue. Now it’s working with Meross, but Home Assistant has never detected it once. The HA Matter Integration and addon don’t even seem to have any useful manual pairing options with a temporary code, like the Meross video suggests. 