Bluetooth Discovery / Connection

Ble.swift

More links -
http://clover-lemongrass.cloudvent.net/blog/2015/06/11/zero-to-ble-on-ios-part-one/
http://clover-lemongrass.cloudvent.net/blog/2015/10/15/developing-ios-app-using-ble-standard/


Here is the complete code to discover peripheral, connect to it and discover its services and characteristics.

1.Connect peripheral

func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
    print("Discovered: \(peripheral.name) at \(RSSI)")
    print("AdvertisementData:\(advertisementData)")

    if peri != peripheral
    {
        peri = peripheral
        peri.delegate = self
        centralManager.connectPeripheral(peri, options: nil)
    }
}
Connection failure or success

func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
    print("Failed to connect \(peripheral) cause of \(error)")
}

func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
    print("connected to \(peripheral)")
//        centralManager.stopScan()
    peripheral.discoverServices(nil)
}
3.DiscoverServices

func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) {
        print("Services:\(peripheral.services) and error\(error)")
        if let services = peripheral.services {
            for service in services {
                peripheral.discoverCharacteristics(nil, forService: service)
            }
        }
    }
Discover Characteristics and set notification

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?)
    {
        print("peripheral:\(peripheral) and service:\(service)")
        for characteristic in service.characteristics!
        {
            peripheral.setNotifyValue(true, forCharacteristic: characteristic)
        }
    }
Handle notification for update value of characteristics

func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?)
    {
        print("characteristic changed:\(characteristic)")
    }