Does use of the Nest API require that the devices are all connected to the external Internet

Question

Can a devices inside of a home communicate with one another using the Nest API without being connected to the external Internet, or does it require traffic to go through a cloud server?

Answer 1

Yes, the Nest API is a cloud API, the communication is through a server at wss://developer-api.nest.com

See the Nest API Intro.