[OBSOLETE] differences between "SmartThings Classic" (the V2 app) and “SmartThings (Samsung Connect)” (the V3 app)

As of this writing, no custom DTHs work with the new V3 app, only the V2 Classic app. So support is telling some brand new customers who want to use devices like Keen vents that they need to also install classic in order to use those devices.

Updated 26 August 2018

Some custom DTHs will now work with the V3 app, but they may require modification. See the following discussion thread:

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