I have several Leaksmart water sensors and a valve. Leaksmart went out of business. Their products work with Zigbee but don't seem to follow standard Zigbee protocol. I can pair it with my EISY but it only shows Temperature. I saw in deconz Github in Germany that someone figured out the protocol for these sensors. I'm pretty sure there are quite a few people here that had this system.
Before I purchase new sensors I thought I would reach out and see if anyone is able to write a plugin for this system.