Is there in wall units similar to the likes of fibaro and aeotec?
The AC Fan Controller replaces a standard AU wall fan/light control
This would be the closest one Inline Switch | Ikuü
Edit: They also have dimmable ones in the same form factor as the switch
Thanks
Just testing the Ikuu single switch dimmer, and can't find any built-in drivers to work at all with that switch. So it will take me a little longer to write the driver for it. Shame that Mercator aren't willing to assist, but hey, they can't invest their time in everything out there. I've also got a Fan/Light Switch, and will be looking at that too. I'll report any progress here.
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Have you tried this? Based on the fingerprints in this thread they all seem to be tuya devices so might be worth trying it out.
Yeah, that didn't work... 
I'm the author of the dimmer module driver @at9 just pointed at.
The driver does rely on already knowing the fingerprint to work at all, so you might need to change the values in the code to match the fingerprint of your device, then try rediscovering/re-pairing the device.
If you can share the dimmer's fingerprint, I can advise on what changes to make if you are not sure.
If it works, I'll be very happy to add the fingerprint to the driver.
I’ll probably borrow some concepts from your work and adapt. I enjoy the challenge so no big deal to figure it out
Go for it 
Not having much luck at all with the Ikuu 1 gang Dimmer. I'd steer clear of this device as nothing works with it, and there isn't enough details to indicate what it needs/wants to work correctly.
I think as a Tuya based device, it has some odd Zigbee protocol over the Data section of the Zigbee message - or at least none of the normal commands sent to the clusters do anything.
This is what is seen as the parsed message sent by the device when you manually turn it on/off etc...
profileId:0104, clusterId:EF00, clusterInt:61184, sourceEndpoint:01, destinationEndpoint:01, options:0040, messageType:00, dni:4EAD, isClusterSpecific:true, isManufacturerSpecific:false, manufacturerId:0000, command:02, direction:01, data:[01, 24, 01, 01, 00, 01, 01]]
profileId:0104, clusterId:EF00, clusterInt:61184, sourceEndpoint:01, destinationEndpoint:01, options:0040, messageType:00, dni:4EAD, isClusterSpecific:true, isManufacturerSpecific:false, manufacturerId:0000, command:02, direction:01, data:[01, 29, 01, 01, 00, 01, 00]]
The first two bytes seem to increment with every incoming message, but the last byte seems to indicate and on/off state.
Any clues or suggestions ??
ID: 0336
Manufacturer: _TZE200_swaamsoy
Product Name:
Model Number: TS0601
deviceTypeId: 210
more...
manufacturer : _TZE200_swaamsoy
idAsInt : 1
inClusters : 0000,0003,0004,0005,0006,0008,0300,EF00
endpointId : 01
profileId : 0104
application : 40
outClusters : 0019,000A
initialized : true
model : TS0601
stage : 4
I agree it looks manufacturer specific - clusterIds in the range 0xfc00 - 0xfff are assigned for that purpose.
[edit - didn't spot that you had published the fingerprint!]
I had a hard time finding a driver that worked with another Tuya based dimmer switch I had, but then I came across this one MOES Zigbee Dimmer Switch - #9 by CPS that worked wonders for me.
Have you tried that one?
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With the ikuu quad switch, does anyone know whether we can switch off the blue led lights? And does it do a dimmer function?
Also, I noticed the neutral wiring is not required (if compared to the nue brand, such as this), is it safe enough to be installed here? Would the sparky complains when we ask them to install one?
Thank you ! Thank you !
That worked and has given me the needed bits to further a driver specific to this device.
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Update for everyone, I have found Ikuu friendly but not very helpful. Definitely a good range of I teresting products both out and on the way, both for retrofitting and new builds. The compact switches a d dimmers that require no neutral for example are very interesting.
I am making decent progress on a driver for the GPOs that I have. As far as I can tell, the power metering is for the entire device, which is a shame, but still very useful. Unlike @gslender , I am finding that everything seems pretty standard in this device.
Mercator is a reputable Australian company that has been in the lighting business for a very long time. The products they sell are for the Australian market with all the required certifications.
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The quad switch does not dim. There is a 1-gang dimmer switch available in the range. I haven’t seen any Zigbee or Zwave dimmer yet that is 2-gang or bigger. But then again, I haven’t looked too hard either.
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For heat / safety reasons I don't think you will find any approved dimmers in Australia, smart or otherwise that are not single gang only.
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