CODEWITHSUNDEEP
swiftcore-bluetoothbluetooth-lowenergycbperipheralcbperipheralmanager
Katie H
Katie H

Reputation: 2293

Peripheral not connecting - Swift

Within my Swift app, I have a view that is supposed to find a bluetooth device and connect to it. The bluetooth device is powered on. I am able to scan and find the device, after which I call on the function to connect to it, but I get no feedback. I am not sure why it is not able to connect.

Neither didFailToConnectPeripheral or didConnectPeripheral are returning any values.

How do I get this to work?

import UIKit
import CoreBluetooth

class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate {

    var manager: CBCentralManager!


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


    func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {

        print("Peripheral: \(peripheral)")

        manager.connectPeripheral(peripheral, options:nil)

        manager.stopScan()

    }



    func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
        print("connected!")
    }

    func centralManager(central: CBCentralManager, didDisconnectPeripheral
        peripheral: CBPeripheral, error: NSError?) {
            print("disconnected!")
    }


    func centralManager(central: CBCentralManager,
        didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
            print("failed")
    }


    func centralManagerDidUpdateState(central: CBCentralManager) {
        print("Checking")
        switch(central.state)
        {
        case.Unsupported:
            print("BLE is not supported")
        case.Unauthorized:
            print("BLE is unauthorized")
        case.Unknown:
            print("BLE is Unknown")
        case.Resetting:
            print("BLE is Resetting")
        case.PoweredOff:
            print("BLE service is powered off")
        case.PoweredOn:
            print("BLE service is powered on")
            print("Start Scanning")
            manager.scanForPeripheralsWithServices(nil, options: nil)
        default:
            print("default state")
        }
    }
}

Upvotes: 7

Views: 5969

Answers (1)

Paulw11
Paulw11

Reputation: 114773

You need to retain the CBPeripheral object that you are trying to connect to, otherwise it is released once the delegate method didDiscoverPeripheral returns.

import UIKit
import CoreBluetooth

class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate {

    var manager: CBCentralManager!
    var connectingPeripheral: CBPeripheral?


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


    func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {

        print("Peripheral: \(peripheral)")

        self.connectingPeripheral=peripheral    

        manager.connectPeripheral(peripheral, options:nil)

        manager.stopScan()
    }

...

}

Upvotes: 13

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