I have created one socket server in node js where I can send some data and receive from the server, but the problem is every time connection is closing and creating new PID for another request. here my requirement is once my IOT device connects to the server then the connection should stay there and I want to send, receive data any time.
Can anyone help me out?
I am posting my code below
Server code
var net = require('net');
// Create Server instance
var server = net.createServer(main);
server.listen(9010, function() {
console.log('server listening on %j', server.address());
});
function main(sock) {
sock.setEncoding("utf8");
sock.on('data', function(data) {
var data = data;
console.log('Request data is ', data);
console.log('Says:', data);
sock.write("responding to client");
sock.write(' exit');
});
sock.on('close', function () {
console.log('connection closed');
});
sock.on('error', function (err) {
console.log('Connection error: %s', err.message);
});
};
Client code
var net = require('net');
//params
var HOST = 'myhost';
var PORT = 9010;
var client = new net.Socket();
client.connect(PORT, HOST, function() {
console.log('CONNECTED TO: ' + HOST + ':' + PORT);
client.write('Hello socket server');
});
client.on('data', function(data) {
console.log('Recieved data: ' + data);
client.destroy();
});
// Add a 'close' event handler for the client socket
client.on('close', function() {
console.log('Connection closed');
});
Related
I am trying to get a client to speak with a server and am unable to receive the events being emitted by the client. The connection is being established as the server console.logs connected to localhost:61201 whenever a client connects; but, there is no response from the clientEvents that are being emitted at intervals by the client.
server.js
const port = 61201;
const ipAddress = "127.0.0.1"
var http = require('http');
var io = require('socket.io');
var server = http.createServer();
server.listen(port, ipAddress);
var socket = io.listen(server);
socket.on('connect', () => {
console.log('connected to localhost:61201');
socket.on('clientEvent', function (data) {
console.log('message from the client:', data);
socket.emit('serverEvent', "thanks server! for sending '" + data + "'");
});
});
client.js
const port = 61201;
const ipAddress = "127.0.0.1";
const url = 'http://' + ipAddress + ':' + port;
var io = require('socket.io-client');
var socket = io(url);
socket.on('connect', () => {
socket.on('serverEvent', function (data) {
console.log('new message from the server:', data);
});
setInterval(function () {
socket.emit('clientEvent', Math.random());
console.log('message sent from the client');
}, 3000);
});
You need to use the socket object that the connect event returns. Try this
socket.on('connect', (clientSocket) => {
console.log('connected to localhost:61201');
clientSocket.on('clientEvent', function (data) {
console.log('message from the client:', data);
clientSocket.emit('serverEvent', "thanks server! for sending '" + data + "'");
});
});
I am building a desktop audio streaming application, which will be a client, i wish to connect to a server socket to stream audio, i have the host ip, the port and password. I am using node to connect:
var client = net.connect(serverDetails, function() { //'connect' listener
console.log('client created!');
});
client.on('connect', function() {
console.log('connected to: '+serverDetails.host+' port: '+serverDetails.port );
//client.write(serverDetails.password+'\r\n');
});
client.on('data', function(data) {
console.log('sending data to server!');
console.log(data.toString());
});
client.on('end', function() {
console.log('disconnected from server');
client.end();
});
at the moment it connects and the disconnects straight away, how can i pass the password so that the connection remains open? after which i can stream/send data to this socket.
I have the simple node.js server that receives udp packages and prints them in the console:
var PORT = 19777;
var MULTICAST_GROUP = "224.0.0.251";
var dgram = require("dgram");
var payload = new Buffer('A wild message appears');
var client = dgram.createSocket("udp4");
client.on("message", function(message, rinfo) {
console.log("received: ",message);
});
client.on("listening", function() {
console.log("listening on ",client.address());
client.setBroadcast(true);
client.setTTL(64);
client.setMulticastTTL(64);
client.setMulticastLoopback(true);
client.addMembership(MULTICAST_GROUP);
client.send(payload, 0, payload.length, PORT, MULTICAST_GROUP, function(err,bytes) {
console.log("err: "+err+" bytes: "+bytes);
// client.close();
});
});
client.on("close", function() {
console.log("closed");
});
client.on("error", function(err) {
console.log("error: ",err);
});
client.bind(19777);
it works remotely on my server. I want to present the received data to each client that will turn on his browser and enter the address of my server. How could I do that?
I have a simple client server web app that is using web sockets to send / receive information. The client can connect and receives properly the config file but then when I try to send a "test' message from the client using "socket.emit('message', {my: 'data'});" it doesn't display on the server. I did check with wireshark and the packets are arriving at the server.
var sIoPort = 8181;
var host = '192.168.4.111';
var fs = require('fs');
var iniMsg = fs.readFileSync('data.json','utf8');
var http = require("http").createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(index);
});
http.listen(sIoPort,host);
var browserServer = require('socket.io').listen(http);
browserServer.on('connection', function (socket) {
console.log('Client websocket connected');
// send the config file if available
browserServer.sockets.emit('msg',iniMsg.toString());
});
browserServer.on('message', function (message) {
console.log('received message: ' + message);
});
client side
///////////////////////////////////////////////////////////////////////////////
socket = io.connect("192.168.4.111",{"port":8181});
socket.on('connect',function() {if(DEBUG) console.log('Socket Connected');});
socket.emit('message', {my: 'data'}); // test if server receives message
socket.on('msg',function(data) {
var json = JSON.parse(data);
// add the maps to the the GUI
switch(json.type) {
case 'maps': add_maps_from_json(json, null);
break;
}
});
socket.on('disconnect',function() {if(DEBUG) console.log('Socket Disconnected');});
/////////////////////////////////////////////////////////////////////////////////
Modify the serverside listener so it's paying attention to events on a socket:
browserServer.on('connection', function (socket) {
console.log('Client websocket connected');
// send the config file if available
browserServer.sockets.emit('msg',iniMsg.toString());
socket.on('message', function (message) {
console.log('received message: ' + message);
});
});
I'm using the code below to test websockets on my browser:
this.webSocket = new WebSocket("ws://echo.websocket.org");
this.webSocket.onopen = function(evt) {
cc.log("Send Text WS was opened.");
};
this.webSocket.onmessage = function(evt) {
this.socketSendTextTimes++;
var textStr = "response text msg: " + evt.data + this.socketSendTextTimes;
cc.log(textStr);
};
The code works well, but if I connect to my own server running the code below:
var http = require('http');
var io = require('socket.io');
var server = http.createServer(function(req, res) {
// Send HTML headers and message
res.writeHead(200,{ 'Content-Type': 'text/html' });
res.end('<h1>Hello!</h1>');
});
var socket = io.listen(server);
socket.set('destroy upgrade', false);
socket.on('connection', function(client) {
client.on('message', function(event) {
console.log('Received message from client!', event);
});
client.on('disconnect', function() {
console.log('Server has disconnected');
});
});
server.listen(8080);
console.log('start to listen');
My browser displays:
hello!
But the listening socket does not do anything. How can I connect to the Socket.IO server using websockets?
Socket.IO uses alternate transport methods than the native websocket, even when emulating websockets themselves. You will need the client library to connect to Socket.IO sockets.