Note: This method returns a
BluetoothDevice for each
device the origin is currently allowed to access, even the ones that are out of range
or powered off. The program can detect when a device comes online or into range by
watching for BlueTooth advertisements by calling
on that device.
var readerPromise = Bluetooth.getDevices();
This method doesn't throw any exceptions.
The definition of 'getDevices()' in that specification.
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