Udp server

F1-22 Updated May 22, 2023 TypeScript luka2220 / dns-resolver-api Star 1 Code Issues Pull requests A simple API that can resolve the IP address for a host nodejs dns network-programming udp-client rfc1035 Updated Dec 24, 2024 TypeScript paranlee / deno-tcp-udp Star 1 Code Issues Pull requests Use Deno as TCP/UDP server. typescript tcp daemon udp tcp-server tcp-client udp-server udp-client deno Updated Aug 17, 2021 TypeScript ablomer / satisfactory-server-status Star 0 Code Issues Pull requests 🎮 A real-time server status monitor for Satisfactory dedicated servers that leverages UDP polling and WebSocket connections for efficient state tracking. docker dashboard websocket udp socket-io node-js udp-client satisfactory Updated Jan 18, 2025 TypeScript Improve this page Add a description, image, and links to the udp-client topic page so that developers can more easily learn about it. Curate this topic Add this topic to your repo To associate your repository with the udp-client topic, visit your repo's landing page and select "manage topics." Learn more

I am often asked to measure the bandwidth of a network path. Many users test this using a simple HTTP download or with speedtest.net. Unfortunately, any test using TCP will produce inaccurate results, due to the limitations of a session-oriented protocol. TCP window size, latency, and the bandwidth of the return channel (for ACK messages) all affect the results. The most reliable way to measure true bandwidth is with UDP. That’s where my friends iperf and bwm-ng come in handy.iperf is a tool for measuring bandwidth and reporting on throughput, jitter, and data loss. Others have written handy tutorials, but I’ll summarise the basics here.iperf will run on any Linux or Unix (including Mac OSX), and must be installed on both hosts. Additionally, the “server” (receiving) host must allow incoming traffic to some port (which defaults to 5001/UDP and 5001/TCP). If you want to run bidirectional tests with UDP, this means you must open 5001/UDP on both hosts’ firewalls.iptables -I INPUT -p udp -m udp --dport 5001 -j ACCEPTA network path is really two paths – the downstream path and the upstream (or return) path. With iperf, the “client” is the transmitter and the “server” is the receiver. So we’ll use the term “downstream” to refer to traffic transmitted from the client to the server, and “upstream” to refer to the opposite. Since these two paths can have different bandwidths and entirely different routes, we should measure them separately.Start by opening terminal windows to both the client and server hosts, as well as the iperf man page. On the server, you only have to start listening. This runs iperf as a server on the default 5001/UDP.root@server:~# iperf -s -u------------------------------------------------------------Server listening on UDP port 5001Receiving 1470 byte datagramsUDP buffer size: 124 KByte (default)------------------------------------------------------------The server will output test results, as well as report them back to the client for display.On the client, you have many options. You can push X data (-b) for Y seconds (-t). For example, to push 1 mbit for 10 seconds:root@client:~# iperf -u -c server.example.com -b 1M -t 10------------------------------------------------------------Client connecting to 172.16.0.2, UDP port 5001Sending 1470 byte datagramsUDP

UDP Hole-PunchingPurposeHave a server negotiate a peer-to-peer connection between two clients in the most direct way possible.Demonstrate Hole-Punching / NAT traversal using the UDP protocol.Demonstrate the support of UPnP.MethodServer:Uses TCP to manage available clients.Uses UDP to learn the public End Point (IP and Port) of clients.Publishes list of connected clients and their End Points.Relays connection requests between clients.Client:Attempts to use UPnP to forward a port to itself on the router (Optional).Sends the server the following information:Hostname (as a friendly name)Whether UPnP is enabled or not.Local UDP port that the client is listening on.List of local IP addresses.Sends a message to the server that it wishes to connect to another client / Receives a message from the server that another client wishes to connect to it. (Both clients will attempt to connect to each other at the same time)Sends 3 ACK requests to each local IP of other client to determine if clients are on the same LAN.If there was no response, sends 99 ACK requests to public/external End Point.If UDP Hole-Punching is successful, a chat window will be shown and a conversation can begin.Everything the client attempts is outputted to a textbox for review.InstructionsRun the GetConnected server executable on a publicly reachable server. (Forward TCP and UDP port to your server on your router.)Change value 'ServerEndpoint' in Client.cs to your servers public IP.Run the P2PClient executable on PCs you want to connect.Click the 'Connect' button in the top left to connect to the server. The server will ensure you always have an updated list of available clients.Select a client and click 'Connect' in the bottom right to connect to it.Observe as two clients begin to establish a connect to each other.

Web-udpweb-udp is a library used to establish unreliable data channels in Node/browser environments. The key goal of this project to provide a small, stable API that anyone can use to work with real-time data on the Web.The library is currently implemented as an abstraction on top of unordered and unreliable RTCDataChannels. Since WebRTC is a dependency, a WebSocket based signaling server is included with the package to facilitate connections between clients. Client/server connections are available with the help of the wrtc package.API.subscribe(subscriber: T => any)Signal.unsubscribe(subscriber: T => any)Client(options?: { url?: string })Client.connect(to?: string = "__MASTER__", options?: { binaryType?: "arraybuffer" | "blob", maxRetransmits?: number, maxPacketLifeTime?: number, metadata?: any, UNSAFE_ordered?: boolean}): PromiseClient.route(): PromiseClient.connections: SignalConnection.send(message: any): voidConnection.close(): voidConnection.closed: SignalConnection.errors: SignalConnection.messages: SignalConnection.metadata: any// NodeServer({ server: http.Server, keepAlivePeriod?: number = 30000 })Server.client(): ClientServer.connections: Signal">SignalT>.subscribe(subscriber: T => any)SignalT>.unsubscribe(subscriber: T => any)Client(options?: { url?: string })Client.connect(to?: string = "__MASTER__", options?: { binaryType?: "arraybuffer" | "blob", maxRetransmits?: number, maxPacketLifeTime?: number, metadata?: any, UNSAFE_ordered?: boolean}): PromiseConnection>Client.route(): Promisestring>Client.connections: SignalConnection>Connection.send(message: any): voidConnection.close(): voidConnection.closed: SignalConnection.errors: Signal{ err: string }>Connection.messages: Signalany>Connection.metadata: any// NodeServer({ server: http.Server, keepAlivePeriod?: number = 30000 })Server.client(): ClientServer.connections: SignalConnection>Installationnpm i @web-udp/clientnpm i @web-udp/serverExamplesClient/ServerBelow is a simple example of a ping server:// client.jsimport { Client } from "@web-udp/client"async function main() { const udp = new Client() const connection = await udp.connect() connection.send("ping") connection.messages.subscribe(console.log)} { connection.messages.subscribe(message => { if (message === "ping") { connection.send("pong") } }) connection.closed.subscribe(() => console.log("A connection closed.")) connection.errors.subscribe(err => console.log(err))})server.listen(8000)">// server.jsconst server = require("http").createServer()const { Server } = require("@web-udp/server")const udp = new Server({ server })udp.connections.subscribe(connection => { connection.messages.subscribe(message => { if (message === "ping") { connection.send("pong") } }) connection.closed.subscribe(() => console.log("A connection closed.")) connection.errors.subscribe(err => console.log(err))})server.listen(8000)MetadataThe metadata option in Client.connect is used to send arbitrary handshake data immediately after establishing a connection. When a new connection is established, the remote client can access this data on the metadata property of the connection object without having to subscribe to the remote client's messages. Handshake metadata is transmitted over a secure RTCDataChannel, making it a good candidate for sensitive data like passwords.In the below example, a server handles authentication before subscribing to the client's messages:// client.jsconst connection = await udp.connect({ metadata: { credentials: { username: "foo", password: "bar", }, },}) { let user try { user = await fakeAuth.login(connection.metadata.credentials) } catch (err) { // Authentication failed, close connection immediately. connection.send(fakeProtocol.loginFailure()) connection.close() return } // The user authenticated successfully. connection.send(fakeProtocol.loginSuccess(user)) connection.messages.subscribe(...)})">// server.jsudp.connections.subscribe(connection => { let user try { user = await fakeAuth.login(connection.metadata.credentials) } catch (err) { // Authentication failed, close connection immediately. connection.send(fakeProtocol.loginFailure()) connection.close() return } // The user authenticated successfully. connection.send(fakeProtocol.loginSuccess(user)) connection.messages.subscribe(...)})P2Pweb-udp also supports peer-to-peer communication. The below example demonstrates two clients connected in the same browser tab:">script src="/page/node_modules/@web-udp/client/dist/index.js">script>script src="client.js">script> connection.messages.subscribe(console.log), ) connection.send("HELLO")}">// client.jsasync function main() { const left =