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class InterfaceController: WKInterfaceController, WCSessionDelegate {
    
    // ...
    
    override func awake(withContext context: Any?) {
        super.awake(withContext: context)
        
        // Configure interface objects here.
        
        messages.append("We are ready!!")

litoarias

import WatchKit
import Foundation
import WatchConnectivity

class InterfaceController: WKInterfaceController {
    
    // 1: Session property
    private var session = WCSession.default
    
    @IBOutlet weak var table: WKInterfaceTable!

litoarias

import Foundation
import WatchConnectivity

class SessionHandler : NSObject, WCSessionDelegate {
    
    // 1: Singleton
    static let shared = SessionHandler()
    
    // 2: Property to manage session

litoarias

import UIKit
// 1: Import Framework
import WatchConnectivity


@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    

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class ViewController: UIViewController {
    
    // 1: Get singleton class whitch manage WCSession
    var connectivityHandler = SessionHandler.shared
    
    // 2: Counter for manage number of messages sended
    var messagesCounter = 0
  
    // ...

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// Receive messages from iPhone
func session(_ session: WCSession, didReceiveMessage message: [String : Any]) {
    // 1: We launch a sound and a vibration
    WKInterfaceDevice.current().play(.notification)
    // 2: Get message and append to list
    let msg = message["msg"]!
    self.items.append("\(msg)")
}

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import WatchKit
import WatchConnectivity

// 1: Encapsulating in a tuple for don't duplicate code
typealias MessageReceived = (session: WCSession, message: [String : Any], replyHandler: (([String : Any]) -> Void)?)

// 2: Protocol for manage all watchOS delegations
protocol WatchOSDelegate: AnyObject {
    func messageReceived(tuple: MessageReceived)

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import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    WatchSessionManager.shared.startSession()

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import UIKit
import WatchConnectivity

class ViewController: UIViewController {
    
    var connectivityHandler = WatchSessionManager.shared
    
    var counter = 0
    
    override func viewDidLoad() {

litoarias

enum RequestType: String {
    case date
    case version
}