Bluetooth Adapter State

Interacting with BLE devices needs specific conditions under which it will possible. To find out what is the current state of the Bluetooth Adapter two functions are available:

bleManager.state(): Promise<$Keys<typeof State>>

The above function returns a Promise which will resolve with current, global State of a BleManager. All APIs are working only when active state is PoweredOn.

onStateChange(
  listener: (newState: $Keys<typeof State>) => void,
  emitCurrentState: boolean = false,
): Subscription

The listener registered will be notified about State changes of a BleManager. When observing is no longer needed one must call subscription.remove() to unsubscribe.

Possible states:

/**
 * Device Bluetooth Low Energy state. It's keys are used to check {@link #blemanagerstate} values
 * received by {@link BleManager}
 */
export const State = {
  /**
   * The current state of the manager is unknown; an update is imminent.
   */
  Unknown: 'Unknown',
  /**
   * The connection with the system service was momentarily lost; an update is imminent.
   */
  Resetting: 'Resetting',
  /**
   * The platform does not support Bluetooth low energy.
   */
  Unsupported: 'Unsupported',
  /**
   * The app is not authorized to use Bluetooth low energy.
   */
  Unauthorized: 'Unauthorized',
  /**
   * Bluetooth is currently powered off.
   */
  PoweredOff: 'PoweredOff',
  /**
   * Bluetooth is currently powered on and available to use.
   */
  PoweredOn: 'PoweredOn'
}