https://smartthings.atlassian.net/browse/DVCSMP-1189
Detect and mark device offline within 5 minutes.
Show Device offline in device tile.
Show Device offline in Recent Activity.
Log the current IP address to Recent Activity.
Log the changed IP address to Recent Activity.
Support 'Turning on' and 'Turning off' (blindly changing the state of
device to ON or OFF without confirming bulb responded correctly)
Turn on / off through Wemo-App reflected timely in SmartThings
App/Ecosystem.
Manual turn on / off of device is reflected timely in SmartThings
App/Ecosystem.
Lower case createEvent
Bug Fixes
Bug fixes
setOffline
Minor cosmetic fixes