Ruby：无法进行UDP套接字连接或向Android发送UDP数据包

Question

美好的一天，

我正在制作一个Android应用程序，它将UDP数据包发送到Ruby服务器，然后将它们转发给所有订阅的Android客户端，包括原始发件人。

我的服务器接收数据包，但无法通过UDP套接字发送或连接。

服务器代码片段（Ruby，在Fedora 22上）：

//
//  ChooseShopViewController.swift
//  MirrorMirror
//
//  Created by Ben on 12/09/15.
//  Copyright (c) 2015 Amber. All rights reserved.
//

import UIKit
import Parse

class ChooseShopViewController: UIViewController {

    var progressView: UIProgressView?
    private var allProducts: [Product] = []
    private var categories: [ProductCategory] = []

    @IBAction func loadProducts(sender: AnyObject) {
        let shopQuery = PFQuery(className:"Shop")
        shopQuery.getObjectInBackgroundWithId("QjSbyC6k5C") {
            (glamour: PFObject?, error: NSError?) -> Void in
            if error == nil && glamour != nil {
                let query = PFQuery(className:"Product")
                query.whereKey("shopId", equalTo: glamour!)
                query.findObjectsInBackgroundWithBlock {
                    (objects: [AnyObject]?, error: NSError?) -> Void in
                    self.getAllProductsAndCategories(objects, error: error)
                }
            } else {
                print(error)
            }
        }

    }
    override func viewDidLoad() {
        super.viewDidLoad()
        // Create Progress View Control
        progressView = UIProgressView(  progressViewStyle:
                                        UIProgressViewStyle.Default)
        progressView?.center = self.view.center
        view.addSubview(progressView!)
    }

    override func prepareForSegue(  segue: UIStoryboardSegue,
        sender: AnyObject?) {
        if (segue.identifier == "dressingRoom") {
            ShopDisplay.sharedInstance.setAllProducts(self.allProducts)
            ShopDisplay.sharedInstance.setAllProductCategories(self.categories)
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }



    func getAllProductsAndCategories(objects: [AnyObject]?, error: NSError?) {
        if error == nil {
            if let objects = objects as? [PFObject] {
                for product in objects {
                    self.getCategory(product)
                    self.getProduct(product)
                }
            }
        } else {
            print("Error: \(error!) \(error!.userInfo)")
        }
    }

    func getCategory(product: PFObject) {
        if let category = product["category"] as? String {
            var alreadyThere: Bool = false
            for item in self.categories {
                if category == item.rawValue {
                    alreadyThere = true
                    break
                }
            }
            if alreadyThere == false {
                self.categories.append(ProductCategory(rawValue: category)!)
            }
        }
    }

    func getProduct(product: PFObject) {
        if let productImage = product["imageFile"] as? PFFile {
            productImage.getDataInBackgroundWithBlock ({
                (imageData: NSData?, error: NSError?) -> Void in
                if let imageData = imageData {
                    let image = UIImage(data:imageData)
                    self.allProducts.append(
                        Product(object: product, image: image!))
                }
                if let downloadError = error {
                    print(downloadError.localizedDescription)
                }
            }, progressBlock: {
                (percentDone: Int32) -> Void in
                    self.progressView?.progress = Float(percentDone)
                if (percentDone == 100) {
                    //self.performSegueWithIdentifier("dressingRoom", sender: UIColor.greenColor())
                }
            })
        }
    }
}

客户端代码段：

SERVER_SEND_PORT = 4000
ANDROID_PORT = 7500

# Send socket
s_socket = UDPSocket.new
s_socket.setsockopt(Socket::SOL_SOCKET,Socket::SO_BROADCAST, 1)
s_socket.bind(SERVER_IP, SERVER_SEND_PORT) 

# Receive socket
r_socket = UDPSocket.new
r_socket.setsockopt(Socket::SOL_SOCKET,Socket::SO_BROADCAST, 1)
r_socket.bind(SERVER_IP, RECEIVE_PORT)

$clientIPs = []
$clientPorts = []

def broadcast(data)             
  $clientIPs.each_with_index do |ip, index|
    puts "trying to send #{data}"
    s_socket.connect(ip, ANDROID_PORT)  # does not pass this step
    puts "connected"
    s_socket.send(data, 0)
    #s_socket.send(data, 0, ip, ANDROID_PORT)
    puts "sent: " + data;
  end
end

while true
  data, client = r_socket.recvfrom(256)
  puts "received: " + data
  Thread.new(client) do |clientAddr|
    if !$clientIPs.include? clientAddr[3]
      $clientIPs << clientAddr[3]
      $clientPorts << clientAddr[1]
    end

    broadcast(data)
  end
end

private static final int LISTENING_PORT = 7500; public void onStart() { /* Unrelated code + Sending socket */ // Receiving Thread new Thread(){ public void run() { // Create receiving socket at a given port try { rSocket = new DatagramSocket(LISTENING_PORT); rSocket.setBroadcast(true); } catch (SocketException e) { e.printStackTrace(); } Log.d("Trace", "Created receiving socket"); while (true) { if (rSocket != null) { // Receive data byte[] buf = new byte[256]; DatagramPacket packet = new DatagramPacket(buf, buf.length); try { rSocket.receive(packet); } catch (IOException e) { e.printStackTrace(); } System.out.println("Got the packet!"); } } } }.start(); } 未在服务器中显示任何UDP连接。