BluetoothLE Enable ?



I have a project to work with BluetoothLE. I try to run the sample code from the ‘adafruit/Basic-Chat/BLECentralViewController.swift’ from github.

I put the break point ‘if central.state == CBManagerState.poweredOn’ to this statement. It always said that ‘Bluetooth Disabled- Make sure your Bluetooth is turned on’.


System Preference/Bluetooth is ‘ON’ and I use BT wireless keyboard and mouse.

Mac Mini (Late 2014) OS: 10.13.3


When I debug with XCode, I try to check the status of CBCentralManagerState. Result is CBCentralManagerStateUnknown. 

How can I enable the Bluetooth?


Thank you for your assistance and help.




note: I also try the code from Apple Developer ‘‘.

The result is almost the same. ‘Bluetooth is not turn on..’,  to CBCentralManagerStateUnknown


switch ([manager state])

{   case CBCentralManagerStateUnsupported:

       state = @”The platform/hardware doesn’t support Bluetooth Low Energy.”;


   case CBCentralManagerStateUnauthorized:

       state = @”The app is not authorized to use Bluetooth Low Energy.”;


   case CBCentralManagerStatePoweredOff:

       state = @”Bluetooth is currently powered off.”;


   case CBCentralManagerStatePoweredOn:

       return TRUE;

   case CBCentralManagerStateUnknown:


       return FALSE;



The following is the code from ‘adafruit/Basic-Chat/BLECentralViewController.swift’ from github’.

/* Invoked when the central manager’s state is updated.

This is where we kick off the scan if Bluetooth is turned on.


func centralManagerDidUpdateState(_ central: CBCentralManager) {

   if central.state == CBManagerState.poweredOn {

       // We will just handle it the easy way here: if Bluetooth is on, proceed…start scan!

       print(“Bluetooth Enabled”)


         } else {

       //If Bluetooth is off, display a UI alert message saying “Bluetooth is not enable” and “Make sure that your bluetooth is turned on”

       print(“Bluetooth Disabled- Make sure your Bluetooth is turned on”)

       let alertVC = UIAlertController(title: “Bluetooth is not enabled”, message: “Make sure that your bluetooth is turned on”, preferredStyle: UIAlertControllerStyle.alert)

       let action = UIAlertAction(title: “ok”, style: UIAlertActionStyle.default, handler: { (action: UIAlertAction) -> Void in

           self.dismiss(animated: true, completion: nil)



       self.present(alertVC, animated: true, completion: nil)



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