Device handler & hub

How the smartthing’s hub detects a custom device handler? What is the technology behind it?

I don’t believe the Hub does which is why all custom dth run in the cloud. I would guess the device commands and responses go up to the cloud and then back down to the hub as needed.

Is it done using fingerprint for a device in the Device Handler metadata block as part of the definition?
Thanks in advance

The initial discovery/pairing uses that…afterward I wouldn’t think it needs to since its already assigned a device type.

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