Connect and read major value

I’m in a controlled room with a single minew beacon that use IBEACON protocol.
BLEController needs to extend CBPeripheralDelegate
I’ll use the first BLE to connect after the search has stop.
Modify the method StopSearchBLE()

class BLEController: CBCentralManagerDelegate, CBPeripheralDelegate{
//...
    func StopSearchMiniewBeacon() {
        let when = DispatchTime.now() + 5 // change 2 to desired number of seconds
        DispatchQueue.main.asyncAfter(deadline: when) {
            self.cb_manager.stopScan()
            self.cb_manager.connect(bles.first)
        }
    }
/...
}

In the documention of your BLE device, you should look for the SERVICE UUID and MAJOR UUID CHARACTERISTIC

var service_uuid =  CBUUID(string: "0000fff0-0000-1000-8000-00805f9b34fb")
var major_uuid =  CBUUID(string: "0000fff2-0000-1000-8000-00805f9b34fb")
func centralManager(_ central: CBCentralManager, didConnect peripheral:             
CBPeripheral) {
    peripheral.delegate = self
    peripheral.discoverServices([service_uuid])
}

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    print("Service: \(service)\n error: \(error)")
    peripheral.discoverCharacteristics([major_uuid], for: (peripheral.services?[0])!)
}

Create a variable ‘service_uuid’ and ‘major_uuid’ like code above. ‘-0000-1000-8000-00805f9b34fb’ is part of the standard. ‘fff0’ is my SERVICE UUID, ‘fff2’ is my MAJOR UUID characteristic and ‘0000’ are required to fill the 4 bytes uuid 1º block.
discoverCharacteristics([major_uuid], for: (peripheral.services?[0])!) will get major characteristic from my device gatt server and it will have NIL as value for now.
(peripheral.services?[0])! - 0 beacuse will return a single value once I did peripheral.discoverServices([service_uuid])

func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    for characteristic in service.characteristics! {
        print("Characteristic: \(characteristic)\n error: \(error)")
        if(characteristic.uuid.uuidString == "FFF2"){
            peripheral.readValue(for: characteristic)
        }
    }
}

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    print("Characteristic read: \(characteristic)\n error: \(error)")
    let major = UInt16.init(bigEndian: UInt16(data: characteristic.value!)!)
    print("major: \(major)")
}

Characteristic value will only be readable after call peripheral.readValue(for: characteristic)
readValue will result in func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) with value in Data type.

Found a mistake? Have a question or improvement idea? Let me know.

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