How can I see the BLE services of a peripheral device? - ios

Question

I would to make app which will allow me to download some data from a peripheral device. I can connect with the peripheral device, but I can’t download services which are supported by this device. I don’t have second app which works as a peripheral. The second device is an iPad which has a virtual peripheral made in LightBlue.app. Sometimes it’s called Blank and sometimes it’s called iPad, I don’t know why.
This is my code:
import UIKit
import CoreBluetooth
class ViewController: UIViewController, CBCentralManagerDelegate{
#IBOutlet var coreBluetooth: UILabel!
#IBOutlet var discoveredDevices: UILabel!
#IBOutlet var foundBLE: UILabel!
#IBOutlet var connected: UILabel!
var centralManager:CBCentralManager!
var blueToothReady = false
var connectingPeripheral:CBPeripheral!
override func viewDidLoad() {
super.viewDidLoad()
startUpCentralManager()
}
func startUpCentralManager() {
centralManager = CBCentralManager(delegate: self, queue: nil)
}
func discoverDevices() {
centralManager.scanForPeripheralsWithServices(nil, options: nil)
}
func centralManager(central: CBCentralManager!, didDiscoverPeripheral peripheral: CBPeripheral!, advertisementData: (NSDictionary), RSSI: NSNumber!) {
discoveredDevices.text = "Discovered \(peripheral.name)"
println("Discovered: \(peripheral.name)")
centralManager.stopScan()
if peripheral.name == "iPad" || peripheral.name == "Blank"
{
println("ok")
centralManager.connectPeripheral(peripheral, options: nil)
self.connectingPeripheral = peripheral
}
}
func centralManagerDidUpdateState(central: CBCentralManager!) { //BLE status
switch (central.state) {
case .PoweredOff:
coreBluetooth.text = "CoreBluetooth BLE hardware is powered off"
case .PoweredOn:
coreBluetooth.text = "CoreBluetooth BLE hardware is powered on and ready"
blueToothReady = true;
case .Resetting:
coreBluetooth.text = "CoreBluetooth BLE hardware is resetting"
case .Unauthorized:
coreBluetooth.text = "CoreBluetooth BLE state is unauthorized"
case .Unknown:
coreBluetooth.text = "CoreBluetooth BLE state is unknown"
case .Unsupported:
coreBluetooth.text = "CoreBluetooth BLE hardware is unsupported on this platform"
}
if blueToothReady {
discoverDevices()
}
}
func centralManager(central: CBCentralManager!,didConnectPeripheral peripheral: CBPeripheral!)
{
connectingPeripheral.discoverServices(nil)
println("Connected")
foundBLE.textColor = UIColor.redColor()
foundBLE.text = "Connected to: \(peripheral.name)"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func scanBLE(sender: UIButton) {
centralManager.scanForPeripheralsWithServices(nil, options: nil)
}
func connectingPeripheral(peripheral: CBPeripheral!, didDiscoverServices error: NSError!)
{
println("Services \(connectingPeripheral.services)")
}
}

Answer 1

You need to set the peripheral's delegate to self in func centralManager(central: CBCentralManager!,didConnectPeripheral peripheral: CBPeripheral!) in order to get the call back when the services are discovered -
func centralManager(central: CBCentralManager!,didConnectPeripheral peripheral: CBPeripheral!)
{
connectingPeripheral.delegate=self
connectingPeripheral.discoverServices(nil)
println("Connected")
foundBLE.textColor = UIColor.redColor()
foundBLE.text = "Connected to: \(peripheral.name)"
}
You will then get a call back to func connectingPeripheral(peripheral: CBPeripheral!, didDiscoverServices error: NSError!)

Answer 2

swift 3
var peripheralDevice:CBPeripheral!
//if connected
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("connected")
self.peripheralDevice.discoverServices(nil)
}
//if disconnect
func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
print("Disconnect")
}
//fail to connect
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
print("Fail to connect, Please try again.")
}