create a bluetooth connection in swift

To create a bluetooth connection in Swift, you need to use the CoreBluetooth framework. Here are the steps to create a bluetooth connection:

Import the CoreBluetooth framework in your project.


main.swift
import CoreBluetooth
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Set up your central manager to scan for and connect to peripherals.


main.swift
class ViewController: UIViewController, CBCentralManagerDelegate {
    
    var centralManager: CBCentralManager!
    var peripheral: CBPeripheral!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        centralManager = CBCentralManager(delegate: self, queue: nil)
    }

    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        if central.state == .poweredOn {
            centralManager.scanForPeripherals(withServices: nil, options: nil)
        } else {
            print("Bluetooth not available.")
        }
    }

    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        self.peripheral = peripheral
        centralManager.connect(peripheral, options: nil)
    }

    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        print("Connected to peripheral.")
        // Now you can start discovering services and characteristics on the peripheral.
    }

    func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
        print("Failed to connect to peripheral.")
    }
}
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Implement the CBPeripheralDelegate methods to discover services and characteristics on the peripheral.


main.swift
extension ViewController: CBPeripheralDelegate {

    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        peripheral.delegate = self
        peripheral.discoverServices(nil)
    }

    func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
        guard let services = peripheral.services else { return }
        for service in services {
            print("Discovered service: \(service.uuid)")
            peripheral.discoverCharacteristics(nil, for: service)
        }
    }

    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
        guard let characteristics = service.characteristics else { return }
        for characteristic in characteristics {
            print("Discovered characteristic: \(characteristic.uuid)")
        }
    }
}
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Connect to your peripheral by implementing the CBCentralManagerDelegate methods.

This code will help you get started with creating a bluetooth connection in Swift. Don't forget to request permission to use Bluetooth in your app's Info.plist file.

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