status_led hooks into all ESPHome components and can indicate the status of
the device. Specifically, it will:
Blink slowly (about every second) when a warning is active. Warnings are active when for example reading a sensor value fails temporarily or the WiFi/MQTT connections are disrupted.
Blink quickly (multiple times per second) when an error is active. Errors indicate that ESPHome has found an error while setting up. In most cases, ESPHome will still try to recover from the error and continue with all other operations.
Stay off otherwise.
# Example configuration entry status_led: pin: GPIO2
pin (Required, Pin Schema): The GPIO pin to operate the status LED on.
id (Optional, ID): Manually specify the ID used for code generation.
If your LED is in an active-LOW mode (when it’s on if the output is enabled), use the
inverted option of the Pin Schema:
status_led: pin: number: D0 inverted: True