Hello. I’ve been looking for a sonoff smart lock but i cant seem to find any? Did sonoff never manufacture a smart lock and if no, does anyone know if they are planning on it?
Nobody knows? 
it’s rather unlikely that there will be such a device.
Thanks for the replies guys. 
It’s a big shame, there is another device missing from the range and there is interest in it.
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Sonoff ahould endeavour to develop a amart lock, preferably one based on the U200 design (asaptable to existing door locks), with a large battery backup, zigbee and wifi connecriciry.
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