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Questions tagged [multicastsocket]

A multicast socket is a bi-directional communications endpoint used for the sending of packets to multiple receivers via multicast (typically IP) or for receiving multicast packets.

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Getting `Can't assign requested address` java.net.SocketException using Ehcache multicast

Getting java.net.SocketException when trying to start a multicast provider: 2013-09-11 11:45:44,204 [main] ERROR net.sf.ehcache.distribution.MulticastRMICacheManagerPeerProvider: Error starting heartbeat. Error was: Can't assign requested…
eebbesen
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MulticastSocket constructors and binding to port or SocketAddress

I may have a fundamental misunderstanding of the term binding here but I am confused about the usage of the MulticastSocket and it's constructors. They no not do what I understand they should do should do so any who can help me clear my…
D-Dᴙum
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Problem with MulticastSocket on Java-Android

I'm starting to code with MulticastSocket, trying to make a simple app with a client and a server to send messages. The code I have for the server: import java.io.IOException; import java.net.DatagramPacket; import java.net.InetAddress; …
Diego Ulloa
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java.net.SocketException: Not a multicast address

I was working with a MulticastSocket and when ever I tried to join a group, it would never work when I was running the group on the "localhost" ip. However, I found this article http://lycog.com/programming/multicast-programming-java/ that stated…
swrap
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Multicast packets: sending and receiving issues

In my adaption of a few multicast tutorials, I changed my method of sending packets. In my case, I create a queue of packets of size bytes[1024], after which it is sent via Socket.Send() over all online network adapters Problem: When sending,…
user2699451
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Is Java MulticastSocket threadsafe?

I have two threads. First one sends datagrams with a MulticastSocket in loop; the second thread receives datagrams using the same instance of MulticastSocket in loop. It seems to be working properly, but I'm still in doubts. Can these two threads…
Lopotun
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How to minimize UDP packet loss

I am receiving ~3000 UDP packets per second, each of them having a size of ~200bytes. I wrote a java application which listens to those UDP packets and just writes the data to a file. Then the server sends 15000 messages with previously specified…
nath
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Occasional java.io.IOException: Operation not permitted only on Android 7.0 by DatagramSocket.send()

The following code works fine virtually 100% time on all Android device Android 7.0: DatagramSocket clientSocket = new DatagramSocket(); clientSocket.setSoTimeout(4000); clientSocket.setReuseAddress(true); …
Hong
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receive multicast from specific network interface on Linux

I'm trying to receive a multicast data from specific network interface on CentOS 5.5 sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(1234); addr.sin_addr.s_addr =…
Dima
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ssdp discovery of upnp devices using multicast sockets

i am trying to discover UPnP devices in the network using multicast sockets however, I seem to be getting the same device multiple times. What is the issue with the discovery code here. The results I am getting are as follows HTTP/1.1 200…
TrustyCoder
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Openwrt allow multicast traffic

I'm running openwrt on a device and have a python script that listens and prints to screen multicast traffic on 239.2.1.1. However nothing is being printed to the screen and I believe this is a firewall issue. How do I make sure that multicast…
Steven Lutz
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UDP with mulicast sockets over wireless network

I wrote a simple udp server client application with multicast sockets. Server is sending packets to three clients every 6 ms . Packet size is 1200 bytes. This is 166,66 packets per second. Whenever one of the client detects a missing packet, it will…
user3852803
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Why is MulticastSocket.setNetworkInterface() much slower using Java 8 runtime?

I am running the following program, which is much slower when I use a Java 8 runtime compared to a Java 7 runtime. public class MulticastTest { public static void main(String args[]) throws Exception { long start = System.nanoTime(); …
K Erlandsson
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Send and receive UDP multicast packets with the same socket

I could not find a working example for this, so I am going to post a question (and let's see if I can reduce this to an MVP code example). So, I need to do mdns queries, I can use two sockets (one for sending / second for receiving) but so far I…
Rudolfs Bundulis
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MulticastSocket not responding after failure

I get a SocketException when trying to call joinGroup(addr) on MulticastSocket. This is only happening on a Windows machine that we have setup to auto start our appliction when the machine is booted up. It seems like the exception is thrown because…
Tony Eichelberger
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