Error [ERR_SOCKET_DGRAM_IS_CONNECTED]: Already connected

Details

My client will not reconnect

Node.js version

v16.13.0

Example code

const web_socket = dgram.createSocket("udp4");
web_socket.connected = false;

web_socket.on("connect", async () => {
	console.log("Connected to socket");
	web_socket.connected = true;
	web_socket.close(); //for test, because the first connect works
});
web_socket.on("close", async () => {
	console.log("Closed connection");
	web_socket.connected = false;
	setTimeout(() => reconnectToSocket(), 1000 * 10);
});

const connectToSocket = (address, port) => {
	web_socket.last_address = address;
	web_socket.last_port = port;
	if (!web_socket.connected) {
		web_socket.connect(port ?? 16, address ?? "localhost");
	}
}
const reconnectToSocket = () => {
	console.log("RECONNECTING");
	console.log(web_socket.connected); //is false rn
	if (web_socket.connected) {
		web_socket.disconnect();
		web_socket.close();
	} else {
		try {
			web_socket.connect(web_socket.last_port ?? 16, web_socket.last_address ?? "localhost");
		} catch (e) {
			console.error(e);
		}
	}
}

connectToSocket("IP", PORT);

Operating system

win 10

Scope

code

Module and version

dgram

Result

Connected to socket
Closed connection
RECONNECTING
false
Error [ERR_SOCKET_DGRAM_IS_CONNECTED]: Already connected

What i trying to do is a reconnect loop

But if i try to send a packet it thow an error, Error [ERR_SOCKET_DGRAM_NOT_RUNNING]: Not running. So its not connected and also not running

@xxAROX

@xxAROX I'm not sure exactly what you're trying to do, but if it helps, this code works:

const dgram = require('dgram');

const web_socket = dgram.createSocket("udp4");

web_socket.on("connect", async (err) => {
	console.log("Connected to socket");
	web_socket.disconnect();
	setTimeout(() => reconnectToSocket(), 1000 * 10);
});

const connectToSocket = (address, port) => {
	web_socket.last_address = address;
	web_socket.last_port = port;
	if (!web_socket.connected) {
		web_socket.connect(port ?? 16, address ?? "localhost");
	}
}
const reconnectToSocket = () => {
	console.log("RECONNECTING");
	try {
		web_socket.connect(web_socket.last_port ?? 16, web_socket.last_address ?? "localhost");
	} catch (e) {
		console.error(e);
	}
}

connectToSocket();

I think there's some confusion about what connect() and disconnect() do. They don't establish a network connection. (UDP is connectionless!) They associate your local socket with a remote address/port. They are a relatively recent addition to the API (added in Node.js 12.x) and I imagine most use cases don't need them. Instead of using connect(), a client can call send() with the address and port:

client.send(message, 41234, 'localhost', (err) => {
  client.close();
});

The documentation could probably be improved. @marsonya is looking into doing that.

ahh okay thank you, that works

Error [ERR_SOCKET_DGRAM_NOT_RUNNING]: Not running
    at new NodeError (node:internal/errors:371:5)
    at healthCheck (node:dgram:909:11)
    at Socket.send (node:dgram:643:3)

ahh, i got this

but first message was received from server

@Trott

@Trott

@Trott

@Trott

I'm sorry. I don't understand what you're asking. Perhaps you can provide some code and explain what's not working the way you expect?

ahh nvm, my issue

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Error [ERR_SOCKET_DGRAM_IS_CONNECTED]: Already connected #3702

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Error [ERR_SOCKET_DGRAM_IS_CONNECTED]: Already connected #3702

Description

Details

Node.js version

Example code

Operating system

Scope

Module and version

Result

Activity

xxAROX commented on Jan 24, 2022

xxAROX commented on Jan 24, 2022

Trott commented on Feb 4, 2022

xxAROX commented on Feb 4, 2022

xxAROX commented on Feb 7, 2022

xxAROX commented on Feb 7, 2022

xxAROX commented on Feb 7, 2022

xxAROX commented on Feb 9, 2022

Trott commented on Feb 9, 2022

xxAROX commented on Feb 10, 2022

xxAROX commented on Feb 10, 2022

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