How to detect number of occupants | Blue Presence Sensor dimmer VZM32-SN

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1

I have the Blue Presence detecting dimmer in Home Assistant over ZHA, and a very simple question:

How do I count the number of occupants in the detection field?
I appreciate this isn’t always going to be 100% accurate, but normally, a presence sensor would tell me if there’s 1, 10, or 50 people in the detection zone.

As far as I can tell, the only accessible attribute is whether presence was detected or not, but not any more specific details.

2

I don’t believe target count is available. Some presence sensors have this capacity, and others don’t. I have a EverythingPresence Lite that can count targets and an EverythingPresence One that can’t. The two use different sensors with different capacities. I think the sensor in the VZM32 might be capable of it, but I’m pretty sure it isn’t exposed via the firmware right now.

3

Fingers crossed it will be available in a firmware update then.
Come to think of it, percentage of coverage would be a good enough approximation for me.

4

The VZM32-SN uses an HLK-LD6002B sensor which can track up to 3 targets simultaneously. You can get this information right now, but you have to enable Target Info reports, which depending on your network and how many switches you have might be overwhelming and cause other messages to be dropped. And it depends on something at the other end being able to understand those Zigbee messages. Basically any of the discussions about getting actual X,Y,Z coordinates of a target for debugging purposes in the main VZM32-SN thread are using this message, so you can get a feel for what’s supported over there. Reporting just the target count–without coordinates or doppler shift–would like be more feasible network-wise to always have enabled, but would be something Inovelli would have to add to the switch’s firmware.

5

Cool - let me read up more about it.
Just the count would be actually be enough for my use case.

I only have one switch right now - I was quite badly affected by the flickering issue with the VZM31-SN, so I was hesitant to pre-order more than one in case it was affected too.