Iphone detecting bluetooth devices

Question

I am doing an iPhone app and I need get the nearby bluetooth devices. I'm using the CoreBluetooth Framework and that doesn't work. I know that this framework is only for Low Energy Bluetooth, so I bought a bluetooth 4.0 usb adapter which support Low-Energy. I'm testing this app in my iPhone 5. This is my code

- (void)centralManagerDidUpdateState:(CBCentralManager *)central{ 
NSString *messtoshow;

switch (central.state) {
    case CBCentralManagerStateUnknown:
    {
        messtoshow=[NSString stringWithFormat:@"State unknown, update imminent."];
        break;
    }
    case CBCentralManagerStateResetting:
    {
        messtoshow=[NSString stringWithFormat:@"The connection with the system service was momentarily lost, update imminent."];
        break;
         }
    case CBCentralManagerStateUnsupported:
         {
        messtoshow=[NSString stringWithFormat:@"The platform doesn't support Bluetooth Low Energy"];
        break;
         }
    case CBCentralManagerStateUnauthorized:
         {
        messtoshow=[NSString stringWithFormat:@"The app is not authorized to use Bluetooth Low Energy"];
        break;
         }
    case CBCentralManagerStatePoweredOff:
         {
        messtoshow=[NSString stringWithFormat:@"Bluetooth is currently powered off."];
        break;
         }
    case CBCentralManagerStatePoweredOn:
         {
        messtoshow=[NSString stringWithFormat:@"Bluetooth is currently powered on and available to use."];
        [mgr scanForPeripheralsWithServices:[NSArray arrayWithObject:[CBUUID UUIDWithString:@"180A"]] options:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey]];

        [mgr retrieveConnectedPeripherals];


        break;
    }               
}
NSLog(messtoshow); 
}   

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:
(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
NSLog(@"Did discover peripheral. peripheral: %@ rssi: %@, UUID: %@ advertisementData: %@ ", peripheral, RSSI, peripheral.UUID, advertisementData);
[mgr retrievePeripherals:[NSArray arrayWithObject:(id)peripheral.UUID]];
}

-(void)centralManager:(CBCentralManager *)central didRetrievePeripherals:(NSArray *)peripherals{
NSLog(@"This is it!");
}

This print "Bluetooth is currently powered on and available to use.", but doesn't find my usb bluetooth or any other nearby bluetooth device. I need a solution for this, Im getting crazy. Thank you very much.

Answer 1

Are you sure that 180A is the right service?

If not try:

[mgr scanForPeripheralsWithServices:nil options:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey]];

Answer 2

Your code seems fine. Search the app store for TI BLE for their free iPhone app.

If their app can not discover your bluetooth device, make sure your bluetooth device is ON and is advertising.