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:
I hope to get some help here as I couldn't find any working examples online. Thanks in advance!
Code Block 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") } }) } }
Code Block 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!
