I have a swift structure which contains a number of items: struct ConfigParams { var MessageID: UInt16 = 0 var SN: UInt16 = 1 var ManufactureData: UInt32 = 0 var Version = [Character](repeating:"?", count:16) } And a member function that returns this as a Data type for transmission over the netork: func asData() -> Data { var data = Data() data.append(withUnsafeBytes(of: MessageID) { Data($0)}) data.append(withUnsafeBytes(of: SN) { Data($0)}) data.append(withUnsafeBytes(of: ManufactureData) { Data($0)}) print("My size before \(data.count)") data.append(withUnsafeBytes(of: Version) { Data($0)}) print("My size after \(data.count)") print(Version.count) return data } When I call "asData()" it gives a Data() with the wrong count of bytes in it! The output of calling the above method is: My size before 8 My size after 16 16 So when I append the contents of Version it it only adding 8 bytes, not 16. But I would expect the final size to be 24! What am I missing here?

I am trying to write a UDP client in Swift 5 which sends data to a UDP server which is running on a windows machine. The UDP Server is written in c# The c# end does this: IPAddress ipAddress = IPAddress.Parse("192.168.1.228); IPEndPoint endPoint = new IPEndPoint(ipAddress, 10010); udpClient = new UdpClient(endPoint); udpClient.Connect("192.168.1.53, 4001); udpClient.BeginReceive(new AsyncCallback(ReceiveCallback), null); And my Swift client is this: class MeetingMaker { var connection: NWConnection? var host: NWEndpoint.Host = "192.168.1.228" var port: NWEndpoint.Port = 10010 var m2h: MotionToHost = MotionToHost() var timer = Timer() func send(_ payload: Data) { connection!.send(content: payload, completion: .contentProcessed({ sendError in if let error = sendError { print("Unable to process and send the data: \(error)") } else { print("Data has been sent") } })) } func startSendingUpdates() { Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { timer in self.sendTick() } } func sendTick() { if connection?.state == .ready { //print("MB SEND") send(m2h.asData()) } } func connect() { connection = NWConnection(host: host, port: port, using: .udp) connection!.stateUpdateHandler = { (newState) in switch (newState) { case .preparing: NSLog("MB: Entered state: preparing") case .ready: NSLog("MB: Entered state: ready") case .setup: NSLog("MB: Entered state: setup") case .cancelled: NSLog("MB: Entered state: cancelled") case .waiting: NSLog("MB: Entered state: waiting") case .failed: NSLog("MB: Entered state: failed") default: NSLog("MB: Entered an unknown state") } } connection!.viabilityUpdateHandler = { (isViable) in if (isViable) { NSLog("MB: Connection is viable") } else { NSLog("MB: Connection is not viable") } } connection!.betterPathUpdateHandler = { (betterPathAvailable) in if (betterPathAvailable) { NSLog("MB: A better path is availble") } else { NSLog("MB: No better path is available") } } connection!.start(queue: .global()) } } And elsewhere : meetingMaker.Connect() And meetingMaker.StartSendingUpdates() The issue is that the UDP Server on windows never receives the packets. I think it expects them to come from source-port 4001? I cannot find how to bind my Swift UDP CLient to send from a specified local port? (The IP addresses are fixed and correct). Is it possible to use Swift to send UDP packets from a specific local port, to the specified destination port? Or is the issue elsewhere?

I'm working on an app which will detect smart-hubs (manufactured by my client) on the local network. There are a few things I need to do: Send UDP Packets to a broadcast address. Receive UDP Packets that have been broadcast to the same address. Use a NWBrowser to find devices which advertise as _mydevice._tcp. In the simulator this is all working well. It will not even build for my development device (iPhone SE running iOS 15.4.1) I have added the NSBonjourServices array, NSLocalNetworkUsageDescription string, and com.apple.developer.networking.multicast boolean into my entitlements file. However xCode is unable to update the provisioning profile: I have tried to follow all Quinn's instructions that lead to this page. but I must be missing something because there is no "Additional Capabilities" tab for my App ID and I cannot see anywhere to request/set the NSBonjour entitlements or udp multicast entitlements for the AppID. I have tried to read the documentaion but getting nowhere. I have missed a secret step somewhere! Please help me get this working. It is vital for our app.

I have an app which detects smart-hubs on the network, then for each smart-hub, detects devices conneted to the hub, then each device has a number of channels. The first view shows all the smart-hubs. Tap on one, and it moves to the next view, which shows all the devices. Tap on a device and it shows all the channels for the chosen device. Each channel is a Slider. When I touch the slider in the channel-view, the navigation immediately pops back one level to the device-view! (See diagram below) Any idea what is causing this? The first view has a binding to an array of Controllers. @Binding var controllers: [Controller] It passes a selected controller to the second view @Binding var controller: Controller, which passes the selected device to the third view. @Binding var canDevice: CanDevice

What is the correct way to re-write this code: randomIV = Data(count: 16) let result = randomIV.withUnsafeMutableBytes { SecRandomCopyBytes(kSecRandomDefault, 16, $0) } To remove this warning: 'withUnsafeMutableBytes' is deprecated: use withUnsafeMutableBytes(_: (UnsafeMutableRawBufferPointer) throws -> R) rethrows -> R` instead