So the Sonoff T4 No Neutral is a bit of a fail on many fronts.
First things first I decided to run it with the Ewelink app just so I could take some screenshots and provide some feedback for @
phaktza like I promised.
Problems started when due to iOS13 (presumably) it was impossible to populate my Wireless SSID to feed it to the app. Okay no super drama I break out ye olde iPad 2 which should do the job.
Wireless SSID populated I still could not discover the device and the instructions inside the little booklet and manual are also deeply lacking if there is some trick to it.
Figured okay disable you 5Ghz AP just in case that is causing the trouble but to no avail.
So Tasmota it is...
Well bloody hell...nobody has seen this thing yet and it is nothing like any of the previously released boards so everyone is guessing everywhere and nobody has anything concrete. Eventually after an hour of Googling and failing myself I stumble on a conversation between the infamous DrZZs and Arendst himself and I they advise that R10 on the back of the board is the easiest GPIO0.
Some hackjobbery to make the ground pin work and off we go.
First attempt it gets stuck at 22% and I suspect I accidentally moved a wire or something. Second attempt I decide I'll hold them in place with my hand....but that makes plugging it in and holding R10 contact very very tricky but after some gymnastics I succeed.
Tasmota installed and using the T1 configuration seems to work just fine.
HOWEVER the problem is at the hardware level that I'm running a grid of GU10 LED downlights on this specific switch in my kitchen....and while the thing is OFF these remain faintly on. I presume this is where the LED flicker module comes in, even though I don't see any flicker they just seem to be very low powered which won't work for me having them eat electricity all day while I'm away.
Issue with that is the LED flicker module needs to be connected between live and neutral running to the lights....which makes the entire exercise of No Neutral absolutely pointless since you need to now get into the roof to go and install this thing which means you may as well have run a neutral down to the light switch and used another OR simply installed a Shelly in the roof where this LED module would need to go and then keep your standard light switches.
So I'll probably find another place somewhere that isn't LED driven and use it there, but as a fair warning to all if you are using LEDs which I'm sure most people in Smart homes are then this will be pretty silly to make use of.
Also it seems insanely bright to me...
Maybe something adjustable in Tasmota for that.
I do like that the wireless light is on high to show you where the light is more easily, and then turns off when the light is on though.