There is a build time task to create the standby environment and run time tasks to toggle between the primary and secondary nodes.

存在一个构建时任务以创建备用环境，以及一个运行时任务以在主节点和辅助节点之间切换。

youdao

Recently my furnace needed some repairs (unrelated to the Nest), and it was super convenient to be able to toggle it on and off from my iPhone in the basement instead of having to run upstairs, turn it on, run down to observe it, then run back up to turn it off.

FORBES: What Is It Like To Own A Nest Thermometer?