I have a solid, reliable, all-zigbee C7...reliable except battery-powered buttons. I've now tried Smartthings, Sonoff, and Iris v2 and all of them drop off if not used. They're located in areas with plenty of hardwired zigbee devices surrounding them. I'm in the process of removing them and replacing with mains-powered zemismart 3-gang switches mounted in tabletop boxes. Like this; Zibgee Long Distance Mailbox Setup - #7 by rcjordan
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