Meaning of “Not supported by host platform” in ESPHome UART docs?

ESPHome
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The ESPHome UART docs for “rx_pin” under the “Configuration variables” section say:

“rx_pin (Optional, Pin): The pin to receive data on from the ESP’s perspective. Use the full pin schema and set inverted: true to invert logic levels. Not supported by host platform.”

What does “Not supported by host platform” actually mean?

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Host platform is where you can run your ESPHome projects on a PC or Mac. It’s handy for when you are testing display components, but obviously limited when it comes to hardware.

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