如何使用apple的Network框架向所有链路本地节点发送UDP消息？

let udpConnection = NWConnection(host: NWEndpoint.Host.local, port: NWEndpoint.Port(1234), using: .udp)

udpConnection.receiveMessage { (data, context, isComplete, error) in
    if let data = data {
        // 处理接收到的消息
        let message = String(data: data, encoding: .utf8)
        print("接收到的消息：\(message ?? "")")
    }
}

let message = "Hello, World!"
let messageData = message.data(using: .utf8)
udpConnection.send(content: messageData, completion: .contentProcessed { (error) in
    if let error = error {
        // 发送消息时发生错误
        print("发送消息错误：\(error)")
    } else {
        // 消息发送成功
        print("消息发送成功")
    }
})

udpConnection.start(queue: .main)