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")
}
}
}
You need to retain the
CBPeripheral
object that you are trying to connect to, otherwise it is released once the delegate methoddidDiscoverPeripheral
returns.