TuyaKeyGrab - NO LONGER FUNCTIONAL - see here for further options - https://github.com/codetheweb/tuyapi
Only works with v 1.0.7 or earlier of the eFamilyCloud app - UPDATE: Unfortunately this no longer works, the webserver denies login for the older version of the app
I've tried messing with the HTTP conversation from the older version of the app and faking a newer version but this still disallows login.
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Install and login to eFamilyCloud (preferably in an emulator) Play Store Link
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Run the app to show the localKey for your device.
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App gathers all localKey messages from the following file:
$ExternalStorageDirectory/Android/data/com.efamily.cloud/cache/1.abj
app-release.apk is the compiled app in Releases Tab
Original idea from Exilit