CODEWITHSUNDEEP
ioscore-bluetooth
user2533604
user2533604

Reputation: 665

What is the difference between CBCentralManagerStatePoweredOn and CBPeripheralManagerState?

Not getting What is the difference between CBCentralManagerStatePoweredOn and CBPeripheralManagerState? At what situations we should use these variables? Can anyone make me understand through Objective-C samples/code?

I am developing an App, where i should know bluetooth power status of my iPhone device through Objective-C. I just want bluetooth power status(ON/OFF).

Upvotes: 3

Views: 3161

Answers (2)

Tommy Devoy
Tommy Devoy

Reputation: 13549

Basic rundown:

CBCentralManagerState is an enum representing the current state of the CBCentralManager. The CBCentralManager is in charge of scannning and connecting to external devices. It will only be CBCentralManagerStatePoweredOn if the device has LE supported hardware and the user has granted permission to the app. 

CBCentralManagerStateUnknown       State unknown, update imminent.
CBCentralManagerStateResetting     The connection with the system service was momentarily lost, update imminent.
CBCentralManagerStateUnsupported   The platform doesn't support the Bluetooth Low Energy Central/Client role.
CBCentralManagerStateUnauthorized  The application is not authorized to use the Bluetooth Low Energy Central/Client role.
CBCentralManagerStatePoweredOff    Bluetooth is currently powered off.
CBCentralManagerStatePoweredOn     Bluetooth is currently powered on and available to use.

CBPeripheralManagerState is an enum representing the state of the CBPeripheralManager. The CBPeripheralManager controls the ability behind advertising and displaying the phone itself to other LE devices in the area. (ie. the CBPeripheralManager allows you to emulate a CBPeripheral). It will likewise only be CBPeripheralManagerStatePoweredOn if the user has explicitly granted permission previously and the device has LE capable hardware.

CBPeripheralManagerStateUnknown       State unknown, update imminent.
CBPeripheralManagerStateResetting     The connection with the system service was momentarily lost, update imminent.
CBPeripheralManagerStateUnsupported   The platform doesn't support the Bluetooth Low Energy Peripheral/Server role.
CBPeripheralManagerStateUnauthorized  The application is not authorized to use the Bluetooth Low Energy Peripheral/Server role.
CBPeripheralManagerStatePoweredOff    Bluetooth is currently powered off.
CBPeripheralManagerStatePoweredOn     Bluetooth is currently powered on and available to use.

Important Note: Neither of these states will ever be updated if you are not setting the CBPeripheralManager and CBCentralManager delegates. It is only then that you will receive the respective delegate callbacks where you can check the state of your central and peripheral.

- (void)centralManagerDidUpdateState:(CBCentralManager *)central

and

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral;

Upvotes: 3

Larme
Larme

Reputation: 26036

Why create a new question?
What I use (well, more or less, I simplified it). Before doing a scan, I call this :if ([self isBLECapableHardware]){[self startScan)];} with managerBLE an instance of CBCentralManager.

-(BOOL)isBLECapableHardware
{
    BOOL        isBLECapable = FALSE;

    switch ([managerBLE state])
    {
        case CBCentralManagerStateUnsupported:
            isBLECapable = FALSE;
            break;
        case CBCentralManagerStateUnauthorized:
            isBLECapable = FALSE;
            break;
        case CBCentralManagerStatePoweredOff:
            isBLECapable = FALSE;
            break;
        case CBCentralManagerStatePoweredOn:
            isBLECapable = TRUE;
            break;
        case CBCentralManagerStateResetting:
            isBLECapable = FALSE;
            break;
        default:
            break;
    }
    return isBLECapable;
}

So, you check [CBCentralManager state]and its values can be CBCentralManagerStateUnsupported (which is equal to 2), CBCentralManagerStateUnknown (which is equal to 0), etc.
By isBLECapableHardware, I mean "is Bluetooth Low Energy capable (iPhone 4S and newer, iPad 3 and newer, iPad mini etc. which has the chip) and ready to use".

Upvotes: 0

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