my.offBluetoothAdapterStateChange

my.offBluetoothAdapterStateChange();

Page({
  onLoad() {
    my.onBluetoothAdapterStateChange(this.handleStateChange);
  },

  handleStateChange(res) {
    console.log('State changed:', res.available);
  },

  onUnload() {
    my.offBluetoothAdapterStateChange(this.handleStateChange);
  }
});

function cleanupBluetooth() {
  // Remove all listeners
  my.offBluetoothAdapterStateChange();
  my.offBluetoothDeviceFound();

  // Stop discovery and close adapter
  my.stopBluetoothDevicesDiscovery();
  my.closeBluetoothAdapter();
}