User Profile

Hey! I have been trying the last few days to discover devices in my network using NWConnection and NWConnectionGroup by sending a SSDP packet to 239.255.255.250 on port 1900 (by definition of SSDP?). I already have the multicast entitlement but that made no difference. Here are the two approaches I have tried: class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = .systemBackground let params: NWParameters = .udp params.allowLocalEndpointReuse = true let connection = NWConnection(host: "239.255.255.250", port: 1_900, using: params) connection.stateUpdateHandler = { [weak viewController = self] state in guard let viewController = viewController else { return } switch state { case .ready: viewController.send(to: connection) default: return } } connection.receiveMessage { (data, context, isComplete, errir) in if let data = data { let dataString = String(data: data, encoding: .utf8) print(dataString ?? "", isComplete) } else { print(data ?? "", isComplete) } } connection.start(queue: .main) } private func send(to connection: NWConnection) { let message = "M-SEARCH * HTTP/1.1\r\nSt: ssdp:all\r\nHost: 239.255.255.250:1900\r\nMan: \"ssdp:discover\"\r\nMx: 1\r\n\r\n" let payload = message.data(using: .utf8) connection.send(content: payload, completion: .contentProcessed { (error) in if let error = error { print(error.localizedDescription) } else { print("ok") } }) } } class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = .systemBackground do { try setupConnection() } catch { print(error.localizedDescription) } } private func setupConnection() throws { let endpoints: [NWEndpoint] = [ .hostPort(host: "239.255.255.250", port: 1_900) ] let params: NWParameters = .udp params.allowLocalEndpointReuse = true let multicast = try NWMulticastGroup(for: endpoints) let group = NWConnectionGroup(with: multicast, using: params) group.setReceiveHandler { (message, data, isComplete) in if let data = data { let dataString = String(data: data, encoding: .utf8) print(message, dataString ?? "", isComplete) } else { print(message, data ?? "", isComplete) } } group.stateUpdateHandler = { [weak viewController = self] (state) in guard let viewController = viewController else { return } switch state { case .ready: viewController.send(to: group) default: return } } group.start(queue: .main) } private func send(to group: NWConnectionGroup) { let message = "M-SEARCH * HTTP/1.1\r\nST: ssdp:all\r\nHOST: 239.255.255.250:1900\r\nMAN: \"ssdp:discover\"\r\nMX: 1\r\n\r\n" let payload = message.data(using: .utf8) group.send(content: payload) { error in if let error = error { print(error.localizedDescription) } else { print("ok") } } } } I hope to get some help here as I couldn't find any working examples online. Thanks in advance!

I have a class where I want to handle the Sign in with Apple logic. I have created an ASAuthorizationController, set the presentationContextProvider to be my view controller and set the delegate to the class itself. When I perform the requests, the system dialog shows up. But upon canceling, my delegate method does not get called. Here is my class: final class AppleSignInProvider: NSObject { typealias CompletionHandler = (Result<AuthCredential, Error>) -> Void enum AuthError: LocalizedError { case credential case nonce case identityToken case identityTokenString } private let completion: CompletionHandler private var authorizationController: ASAuthorizationController? init(completion: @escaping CompletionHandler) { self.completion = completion } private var currentNonce: String? private func sha256(nonce: String) -> String { let inputData = Data(nonce.utf8) let hashedData = SHA256.hash(data: inputData) let hashString = hashedData.compactMap { return String(format: "%02x", $0) }.joined() return hashString } func signIn(viewController: UIViewController) { let nonce = randomNonceString() currentNonce = nonce let request = ASAuthorizationAppleIDProvider().createRequest() request.requestedScopes = [ .fullName, .email ] request.nonce = sha256(nonce: nonce) let authorizationController = ASAuthorizationController(authorizationRequests: [request]) authorizationController.presentationContextProvider = viewController.view.window authorizationController.delegate = self authorizationController.performRequests() self.authorizationController = authorizationController } // Adapted from https://auth0.com/docs/api-auth/tutorials/nonce#generate-a-cryptographically-random-nonce private func randomNonceString(length: Int = 32) -> String { precondition(length > 0) let charset: [Character] = Array("0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._") var result = "" var remainingLength = length while remainingLength > 0 { let randoms: [UInt8] = (0 ..< 16).map { _ in var random: UInt8 = 0 let errorCode = SecRandomCopyBytes(kSecRandomDefault, 1, &random) guard errorCode == errSecSuccess else { fatalError("Unable to generate nonce. SecRandomCopyBytes failed with OSStatus \(errorCode)") } return random } randoms.forEach { random in if remainingLength == 0 { return } if random < charset.count { result.append(charset[Int(random)]) remainingLength -= 1 } } } return result } } extension AppleSignInProvider: ASAuthorizationControllerDelegate { func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) { do { guard let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential else { throw AuthError.credential } guard let nonce = currentNonce else { throw AuthError.nonce } guard let appleIDToken = appleIDCredential.identityToken else { throw AuthError.identityToken } guard let idTokenString = String(data: appleIDToken, encoding: .utf8) else { throw AuthError.identityTokenString } let credential = OAuthProvider.credential(withProviderID: "apple.com", idToken: idTokenString, rawNonce: nonce) completion(.success(credential)) } catch { completion(.failure(error)) } } func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) { completion(.failure(error)) } } My delegate methods are called when the view controller is set as delegate, but that is not a fix for my issue.

Hi! Currently I am facing an issue I don't fully understand. I have to get the steps and distanceWalkingAndRunning and sync it to the backend periodically for which I have registered a BGTaskScheduler and created a request to trigger it every 15 minutes. I understand that it's just a request to trigger it every 15 minutes, in reality the OS decides when to run it, no earlier than the set time. For debugging purposes, one can trigger the task manually which I tried and succeeded. Works as expected. App is running, the task gets registered and scheduled, I pause the app and send the command to trigger the task. Upon resuming the app, my task gets executed, the HealthKit query goes through and submits the correct values to the backend. Now to the issue. If I run the app normally, and wait for the task to get executed, for some reason the HealthKit query always returns 0, ergo syncing wrong values to the backend. It's hard to debug this case, I have all the permission I need to read the data and works properly when run manually. Either i need a special entitlement or this is a bug or I am missing something (most likely?). I hope to get some help here.