Thanks to all contributors to this thread I was able to smartify my existing 2-way switch, powering my hallway lights.
A couple of notes:
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It sort of bothers me to look at this bulb with the single wire so I’m adding my own diagram
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I was taught lights don’t have a live and a neutral wire, they have a live and a ‘lamp’ wire, and the huge difference is that you should never ever break a neutral. Фаза and Лампов on my diagram
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I had a spare Live at my 2nd switch which made installation simple, however it was coming from a 2nd breaker (same phase, different breakers). Technically not an issue, but I don’t feel proud about it. Also, killing this 2nd breaker breaks the 2-way switch circuit, so I would assume if the Sonoff ZBMini goes dead for whatever reason (not Off but like dead) it will mean I have no lights. Which isn’t good.
I’d love to see other implementations.