udpclient

Send and receive data on UDP Socket java android

由 对着背影说爱祢 提交于 2019-11-28 17:36:59
I am able to properly send my data through UDP socket , but when I receive data it keeps on waiting at receive command I don't know what is causing this. Please have a look at my code below. I am able to properly receive data at server side from android device, but when I send data from server side to android device it doesn't receive. but when I send data from server to any other client e.g PC application it receive and displays data properly. class Task implements Runnable { @Override public void run() { try { String messageStr = "feed"; int server_port = 8888; InetAddress local =

Sender IP/Port for UDP Socket

由 半腔热情 提交于 2019-11-28 10:35:46
问题 Is it possible to obtain the sender IP and (dynamically obtained) port with C sockets? I have the following: memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_DGRAM; if ((rv = getaddrinfo(NULL, DATABASEPORT, &hints, &servinfo)) != 0) { fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv)); exit(1); } for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror("socket"); continue; }

Can I set the timeout for UdpClient in C#?

由 倖福魔咒の 提交于 2019-11-28 08:54:40
I am wondering whether I can set a timeout value for UdpClient receive method. I want to use block mode, but because sometimes udp will lost packet, my program udpClient.receive will hang there forever. any good ideas how I can manage that? What Filip is referring to is nested within the socket that UdpClient contains ( UdpClient.Client.ReceiveTimeout ). You can also use the async methods to do this, but manually block execution: var timeToWait = TimeSpan.FromSeconds(10); var udpClient = new UdpClient( portNumber ); var asyncResult = udpClient.BeginReceive( null, null ); asyncResult

await UDPClient.ReceiveAsync with timeout

由 安稳与你 提交于 2019-11-28 08:40:41
问题 I'm using UDPClient like below dim c = New UDPClient(port) client.CLient.ReceiveTimeout = 1 await client.ReceiveAsync() However the await does not terminate or throw even though I have set a timeout. Is this normal behaviour? 回答1: It is explicitly mentioned in the MSDN Library article for Socket.ReceiveTimeout: Gets or sets a value that specifies the amount of time after which a synchronous Receive call will time out. Emphasis added. You are doing the opposite of a synchronous receive when

What is the size of udp packets if i send 0 payload data in c#?

由 落花浮王杯 提交于 2019-11-28 07:02:56
I have figured out the maximum data before fragmentation between 2 endpoints using udp is 1472(other endpoints may vary). this states that mtu is 1500bytes and header overhead per packet is 28bytes.is it safe to assume that if i send 0 bytes data(payload), the actual data being transferred is 28bytes? im doing some bencchmark, so its crucial for me to know what happens in the channel. thanks. The MTU is the maximum size of an IP packet that can be transmitted without fragmentation. IPv4 mandates a path MTU of at least 576 bytes, IPv6 of at least 1280 bytes. Ethernet has an MTU of 1500 bytes.

Broadcasting UDP message to all the available network cards

由 可紊 提交于 2019-11-27 20:45:17
I need to send a UDP message to specific IP and Port. Since there are 3 network cards, 10.1.x.x 10.2.x.x 10.4.x.x when i send a UDP message,i am receiving the message only in one network adapter...the rest of the ip's are not receiving. I want to check for the network adapter while sending the message. How can I do that? Currently I am using the following: IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse(LocalIP), 0); IPEndPoint targetEndPoint = new IPEndPoint(TargetIP, iTargetPort); UdpClient sendUdpClient = new UdpClient(localEndPoint); int numBytesSent = sendUdpClient.Send

UDP: Read data from all network interfaces

由 情到浓时终转凉″ 提交于 2019-11-27 18:35:31
问题 I've the following code to read multicast message coming from the network, for a specified IP+Port private static void ReceiveMessages(int port, string ip, CancellationToken token) { Task.Factory.StartNew(() => { using (var mUdpClientReceiver = new UdpClient()) { var mReceivingEndPoint = new IPEndPoint(IPAddress.Any, port); mUdpClientReceiver.ExclusiveAddressUse = false; mUdpClientReceiver.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

Receive messages continuously using udpClient

由 痞子三分冷 提交于 2019-11-27 10:34:48
问题 I was looking for the best solution to receive and process messages via UdpClient class in C# . Does anyone have any solutions for this? 回答1: Try this code : //Client uses as receive udp client UdpClient Client = new UdpClient(Port); try { Client.BeginReceive(new AsyncCallback(recv), null); } catch(Exception e) { MessageBox.Show(e.ToString()); } //CallBack private void recv(IAsyncResult res) { IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 8000); byte[] received = Client

What is the size of udp packets if i send 0 payload data in c#?

由 ￡可爱￡侵袭症＋ 提交于 2019-11-27 01:46:05
问题 I have figured out the maximum data before fragmentation between 2 endpoints using udp is 1472(other endpoints may vary). this states that mtu is 1500bytes and header overhead per packet is 28bytes.is it safe to assume that if i send 0 bytes data(payload), the actual data being transferred is 28bytes? im doing some bencchmark, so its crucial for me to know what happens in the channel. thanks. 回答1: The MTU is the maximum size of an IP packet that can be transmitted without fragmentation. IPv4

Send and receive data on UDP Socket java android

由 拥有回忆 提交于 2019-11-27 00:30:41
问题 I am able to properly send my data through UDP socket , but when I receive data it keeps on waiting at receive command I don't know what is causing this. Please have a look at my code below. I am able to properly receive data at server side from android device, but when I send data from server side to android device it doesn't receive. but when I send data from server to any other client e.g PC application it receive and displays data properly. class Task implements Runnable { @Override
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