Data to Int / String in swift3

Question

I'm working with BLE device. Device is sending values in specific UUID.
Here is my code for converting Data to Int or String for display.

...
else if characteristic.uuid == CBUUID(string: UUID_CHANGEIN_BATTERY_LEVEL) {
//            let battery = UInt32(bigEndian: ((characteristic.value?.withUnsafeBytes { $0.pointee }) ?? 0))
            let array : [UInt8] = [0, 0, 0]
            var data = Data(bytes: array)
            if characteristic.value != nil {
                data.append(characteristic.value!)
            }
            let battery = UInt32(bigEndian: ((data.withUnsafeBytes { $0.pointee }) ?? 0))
            print("battery level changed\nNew level is \(getInt(fromData: characteristic.value!, start: 0))!")
//            lblBattery.text = (String(data: characteristic.value!, encoding: String.Encoding.utf8) ?? "0") + "%"
            lblBattery.text = "\(getInt(fromData: characteristic.value!, start: 0))%"

        }
...
func getInt(fromData data: Data, start: Int) -> Int32 {
        let intBits = data.withUnsafeBytes({(bytePointer: UnsafePointer<UInt8>) -> Int32 in
            bytePointer.advanced(by: start).withMemoryRebound(to: Int32.self, capacity: 4) { pointer in
                return pointer.pointee
            }
        })
        return Int32(bigEndian: intBits)
//        return Int32(littleEndian: intBits)
    }

I've checked in BLE Scanner iOS app, that is displaying 0x2b01 as value and it also display 43 as a battery %.
I wrote 3-4 kind of code as you see above. But none of them are giving me 43 as a value.

Please help me find where I've done something wrong or which I'm missing to meet my requirement.

Answer 1

swift 3

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {

   let value = [UInt8](characteristic.value!)

   print("Battery ", value[0], "%")
}