MPTCP Network.framework example

mptcp_client.swift

import Foundation
import Network

func sendAndReceiveData(connection: NWConnection) {
    let data = "Hello, server!".data(using: .utf8)
    connection.send(content: data, completion: .contentProcessed({ error in
        if let error = error {
            print("Failed to send data: \(error)")
        } else {
            print("Message sent successfully")
        }
    }))

    receiveData(connection: connection)
}

func receiveData(connection: NWConnection) {
    connection.receive(minimumIncompleteLength: 1, maximumLength: 1024) { data, context, isComplete, error in
        if let data = data, !data.isEmpty {
            let message = String(data: data, encoding: .utf8) ?? "Invalid UTF-8 data"
            print("Received: \(message)")
        } else if let error = error {
            print("Receive failed: \(error)")
            return
        }

        receiveData(connection: connection)
    }
}

func createInteractiveConnection(ip: String, port: UInt16) {
    let host = NWEndpoint.Host(ip)
    let endpointPort = NWEndpoint.Port(rawValue: port)!
    let parameters = NWParameters.tcp
    parameters.multipathServiceType = .interactive

    let connection = NWConnection(host: host, port: endpointPort, using: parameters)

    connection.start(queue: .main)

    connection.stateUpdateHandler = { state in
        switch state {
        case .ready:
            print("Connection established to \(ip):\(port)")
            sendAndReceiveData(connection: connection)
        case .failed(let error):
            print("Connection failed: \(error)")
        default:
            break
        }
    }

    dispatchMain()
}

let args = CommandLine.arguments
let (ip, port) = (args[1], UInt16(args[2])!)
createInteractiveConnection(ip: ip, port: port)