I found a cool tutorial to code an app that lists all available Bluetooth Devices on an iOS 10 iPhone in Swift. It works O-K. Running the app on my iPhone with bluetooth on, it finds and presents my Macbook, a linux computer, and random 'unnamed' devices in a tableView. However, it cannot find my BeatsByDre wireless headphones, Raspberry Pi in Discoverable Mode nor a simple bluetooth dongle plugged into a computer (running linux).
My question is: what the hell am I not understanding/doing wrong?
Here's my code for the Table View:
import CoreBluetooth
import UIKit
class ScanTableViewController: UITableViewController,CBCentralManagerDelegate {
var peripherals:[CBPeripheral] = []
var manager: CBCentralManager? = nil
var parentView:MainViewController? = nil
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
scanBLEDevice()
}
func scanBLEDevice(){
manager?.scanForPeripherals(withServices: nil, options: nil)
DispatchQueue.main.asyncAfter(deadline: .now() + 60.0) {
self.stopScanForBLEDevice()
}
}
func stopScanForBLEDevice(){
manager?.stopScan()
print("scan stopped")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return peripherals.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "scanTableCell", for: indexPath)
let peripheral = peripherals[indexPath.row]
cell.textLabel?.text = peripheral.name
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let peripheral = peripherals[indexPath.row]
manager?.connect(peripheral, options: nil)
}
//CBCentralMaganerDelegate code
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
if (!peripherals.contains(peripheral)){
peripherals.append(peripheral)
}
self.tableView.reloadData()
}
func centralManagerDidUpdateState(_ central: CBCentralManager) {
print(central.state)
}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
// pass reference to connected peripheral to parentview
parentView?.mainPeripheral = peripheral
peripheral.delegate = parentView
peripheral.discoverServices(nil)
// set manager's delegate view to parent so it can call relevant disconnect methods
manager?.delegate = parentView
parentView?.customiseNavigationBar()
if let navController = self.navigationController{
navController.popViewController(animated: true)
}
print("Connected to "+peripheral.name!)
}
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
print(error!)
}
Basically, I look for peripherals and list them to this Table View Controller. How come I can't see my wireless headphones in the list but I can see them under Settings>Bluetooth? Am I completely misunderstanding what a Peripheral is? I've read the Apple docs and then some. What am I supposed to look for in my code? Should I be using Beacons/iBeacon?
