No bluetooth power/enabled alert about kontakt-ios-sdk

[stoprocent]

Hi @jvanakker

Just initialising CBCentralManager as far as I know will not prompt for turning on Bluetooth Radio.
You have to set option key CBCentralManagerOptionShowPowerAlertKey to YES.
I will mark this as a feature request to create an option to set this somewhere in the SDK.
This is not a big change and it's a reasonable to add it so please expect this in the next SDK release.

[mikestalker]

Any updates?

[mikestalker]

@stoprocent is anybody there? With new iOS 11 buggy bluetooth management, it would be great to check via SDK if bluetooth enabled and so on.

[stoprocent]

Hi @mikestalker, checking if bluetooth is ON has nothing to do with CBCentralManagerOptionShowPowerAlertKey. We are about to release new SDK next week. Is this option crucial for you ?

[mikestalker]

Hi @stoprocent, i had problem now with BT. I checked it with CBCentralManager and CBCentralManagerOptionShowPowerAlertKey, but it returned in centralManagerDidUpdateState "CBManagerState.poweredOff". BT was enabled, i've rebooted device, cleaned project, reinstalled app, but no luck. And than "Allow New Connections" appeared in the Bluetooth settings page. And only after i tapped it - CBCentralManager said to me that BT is poweredOn.
So after updating to iOS11 there are a lot of problems related to BT (https://www.asurion.com/connect/tips-and-tricks/new-features-ios-11-update/) and it would be great if developers can just ask SDK if BT is ON and do some call to show system alert with "go to settings button".

[stoprocent]

@mikestalker Are you using NSBluetoothPeripheralUsageDescription ?
Have a look here https://developer.kontakt.io/ios-sdk/quickstart/installation/#first-steps-after-installation under Bluetooth usage

[mikestalker]

@stoprocent yep, i have this property in my info.plist

[stoprocent]

@mikestalker SDK 1.5.1 is up now. Can you try using it?

There is a option to set CBCentralManagerOptionShowPowerAlertKey.

Have a look here: http://kontaktio.github.io/kontakt-ios-sdk/Documentation/html/Classes/Kontakt.html#//api/name/setCentralManagerPowerAlert:

[mikestalker]

@stoprocent ok. I set this key and what is next? Now in my project to check BT state and/or show alert i use this code

self.bCentralManger = CBCentralManager(delegate: self, queue: DispatchQueue.main, options: [CBCentralManagerOptionShowPowerAlertKey: withAlert]) self.bCentralManger.scanForPeripherals(withServices: nil, options: nil)

and

func centralManagerDidUpdateState(_ central: CBCentralManager) { switch central.state { case CBManagerState.poweredOff: print("Powered Off") btTurnedOn = false case CBManagerState.poweredOn: print("Powered On") btTurnedOn = true case CBManagerState.unsupported: print("Unsupported") btTurnedOn = false case CBManagerState.resetting: print("Resetting") btTurnedOn = false fallthrough case CBManagerState.unauthorized: print("Unauthorized") btTurnedOn = false case CBManagerState.unknown: print("Unknown") btTurnedOn = false } }

How your solution will help? Does it runs scanForPeripherals somewhere so alert appears? I set this key and got nothing.
As i wrote before

and it would be great if developers can just ask SDK if BT is ON and do some call to show system alert with "go to settings button".

[stoprocent]

@mikestalker I'm a bit confused what are you trying to achieve but if I'm correct this is the solution you are looking for.

1. You use ur old code but before initializing KTKDevicesManager set config like this:

// Config
[Kontakt setCentralManagerPowerAlert: YES];

// Your Code
self.kontaktDevicesManager = [[KTKDevicesManager alloc] initWithDelegate:self];
[self.kontaktDevicesManager startDevicesDiscoveryWithInterval:1.0];

2. If central manager state is NOT .poweredOn you will get a call to devicesManagerDidFailToStartDiscovery:withError:. Error object will contains central manager state to check or you can read centralState from KTKDevicesManager.

3. If bluetooth is on and working you will get call to devicesManager:didDiscoverDevices:

Is that ok ?

[mikestalker]

@stoprocent thanks for quick reply. But it's a bit different situation in my case. I use
manager = KTKBeaconManager(delegate: self)
manager.startMonitoring(for: region)

and do not use KTKDevicesManager

[stoprocent]

If you are using KTKBeaconManager then it's CoreLocation based so you don't have to check CoreBluetooth.

[mikestalker]

@stoprocent will function func beaconManager(_ manager: KTKBeaconManager, didRangeBeacons beacons: [CLBeacon], in region: KTKBeaconRegion) be fired if BT if turned off? On my device - no. Maybe i do something wrong?

[stoprocent]

@mikestalker you should read CoreLocation or KTKBeaconManager documentation first.

There is this delegate method: beaconManager:rangingBeaconsDidFailForRegion:withError: .

As far as I can see here this is not an issue with the SDK. If bluetooth is of and you try to range beacons you will receive this error.

[mikestalker]

@stoprocent Ok. I got error "error?.localizedDescription "The operation couldn’t be completed. (kCLErrorDomain error 16.)"". And how it can help me???
One more time. I need show user that "we do not see any beacons because your BT is turned off" and suggest him go to system preferences and turn TB on.

Other developers ( @jvanakker ) and I suggest you to implement this feature in SDK. But you are saying that

If you are using KTKBeaconManager then it's CoreLocation based so you don't have to check CoreBluetooth.

I'm saying that beacons will not be found if BT is off, and you are saying "RTFM, use error delegate method and so on." But still, I need show user SYSTEM ALERT with option "GO TO SYSTEM PREFERENCES".

Summary: no BT is on - show system alert and tell user go to system preferences and turn BT on. User do not cares if

KTKBeaconManager then it's CoreLocation based so you don't have to check CoreBluetooth.

[stoprocent]

@mikestalker I'm confused right now and I don't think I'm able to help you. It looks like you are not familiar with basic objects like Error or NSError.

You said:

Ok. I got error "error?.localizedDescription "The operation couldn’t be completed. (kCLErrorDomain error 16.)"". And how it can help me???

Error object is built out of domain and code and in my last comment I said look at THIS.
case rangingUnavailable = 16

If you would look in documentation you would see that error code 16 translates to:

This might happen if the device is in Airplane mode or if Bluetooth or location services are disabled.

To complete what you are looking for just implement beaconManager:rangingBeaconsDidFailForRegion:withError: check if error code is equal 16 and display message to the user. So simple ...

I have provided you with 2 different solutions.

1. Check CoreBluetooth state with KTKDevicesManager
2. Use KTKBeaconManager

If this is not enough I'm not sure if I can be of any further help.

[stoprocent]

@mikestalker what @jvanakker was asking for was different and again I would recommend you to stop and go trough this topic and read carefully each comment.