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Document bluetooth.async_scanner_count (#1452)

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J. Nick Koston 2022-08-29 09:21:55 -05:00 committed by GitHub
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docs/network_discovery.md
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@ -104,6 +104,17 @@ from homeassistant.components import bluetooth
scanner = bluetooth.async_get_scanner(hass)
```
### Determine if there is scanner running
The Bluetooth integration may be set up but has no connectable adapters or remotes. The `bluetooth.async_scanner_count` API can be used to determine if there is a scanner running that will be able to receive advertisements or generate `BLEDevice`s that can be used to connect to the device. An integration may want to raise a more helpful error during setup if there are no scanners that will generate connectable `BLEDevice` objects.
```python
from homeassistant.components import bluetooth
count = bluetooth.async_scanner_count(hass, connectable=True)
```
### Subscribing to unavailable callbacks
To get a callback when the Bluetooth stack can no longer see a device, call the `bluetooth.async_track_unavailable` API. For performance reasons, it may take up to five minutes to get a callback once the device is no longer seen.