[OBSOLETE] Sonoff, Sonoff TH, S20, Dual, 4CH, POW, & Touch Device Handler & SmartApp ($5 & $10 Smart Switches)

Devices & Integrations Community Created Device Types
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There is a pretty good teardown here http://thegreatgeekery.blogspot.ca/2016/02/ecoplug-wifi-switch-hacking.html