Sketch of a BindableObject for finding friends by local PTP

BluetoothCentral.swift

//
//  BluetoothCentral.swift
//
//  Created by Johan Lindskogen on 2019-06-16.
//  Copyright © 2019 Johan Lindskogen. All rights reserved.
//

import SwiftUI
import CoreBluetooth
import Combine

let serviceUUID = CBUUID(string: "99EE9B56-C16C-40F7-9449-612684B6EBAE")


class BluetoothCentral: NSObject, BindableObject, CBPeripheralManagerDelegate, CBCentralManagerDelegate {
    let didChange = PassthroughSubject<Void, Never>()
    
    var central: CBCentralManager
    var peripheral: CBPeripheralManager
    
    var clients : Set<CBPeripheral> = [] {
        didSet {
            didChange.send(())
        }
    }
    
    override init() {
        self.central = CBCentralManager()
        self.peripheral = CBPeripheralManager()
    }
    
    func start() {
        central.delegate = self
        peripheral.delegate = self
        
        
        let myCharacteristic = CBMutableCharacteristic(type: serviceUUID, properties: [.read, .notifyEncryptionRequired], value: nil, permissions: CBAttributePermissions.readEncryptionRequired)
        
        let myService = CBMutableService(type: serviceUUID, primary: true)
        
        myService.characteristics = [myCharacteristic]
        
        peripheral.add(myService)
        
        central.scanForPeripherals(withServices: [serviceUUID], options: nil)
        
        peripheral.startAdvertising([CBAdvertisementDataServiceUUIDsKey: [serviceUUID]])
    }
    
    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        
    }
    
    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        self.clients.insert(peripheral)
    }
    
    
    func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
        
    }
    
    func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveRead request: CBATTRequest) {
        
    }
}