Sonoff ZBmini can be used in this way. It only has one dry relay input. Just power it with Live, Neutral and Earth and leave the switched live output disconnected. You can set up automations based on the state of the dry contact input. This is how I control my smart lighting and I have retained the normal light switches to keep it simple for my family.
Sonoff ZBmini can be used in this way. It only has one dry relay input. Just power it with Live, Neutral and Earth and leave the switched live output disconnected. You can set up automations based on the state of the dry contact input. This is how I control my smart lighting and I have retained the normal light switches to keep it simple for my family.