How to Emit data from function using Socket io - node.js

Question

I am very beginner in NodeJS, I am taking data from S71200 PLC device using nodes7 library, I want to pass data using socket io emit but I can't pass data to socket io emit below my code
app.js
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var nodes7 = require('nodes7'); // This is the package name, if the repository is cloned you may need to require 'nodeS7' with uppercase S
var conn = new nodes7;
var doneReading = false;
var doneWriting = false;
var variables = {
TEST7: 'DB1,INT2.3',
TEST1: 'DB1,X0.0.3',
TEST2: 'DB1,INT2'
};
conn.initiateConnection({port: 102, host: '127.0.0.1', rack: 0, slot: 1}, connected);
function connected(err) {
if (typeof(err) !== "undefined") {
// We have an error. Maybe the PLC is not reachable.
console.log(err);
process.exit();
}
conn.setTranslationCB(function(tag) {return variables[tag];}); // This sets the "translation" to allow us to work with object names
conn.addItems(['TEST7','TEST1']);
//conn.writeItems('TEST2', 90, valuesWritten);
setInterval(function(){
conn.readAllItems(valuesReady);
},1000)
}
function valuesReady(anythingBad, values) {
if (anythingBad) { console.log("SOMETHING WENT WRONG READING VALUES!!!!"); }
console.log(values.TEST1[0],values.TEST1[1],values.TEST1[2],values.TEST7[0],values.TEST7[1],values.TEST7[2]);
//console.log( typeof(temp));
doneReading = true;
}
function valuesWritten(anythingBad) {
if (anythingBad) { console.log("SOMETHING WENT WRONG WRITING VALUES!!!!"); }
console.log("Done writing.");
doneWriting = true;
}
io.on('connection',function(socket){
console.log('one user connected '+socket.id);
socket.emit("channelname", {
message: "Passing S71200 data"
});
socket.on('disconnect',function(){
console.log('one user disconnected '+socket.id);
});
})
http.listen(3000,function(){
console.log('server listening on port 3000');
})
I am using interval function because every second data fetch from PLC device, I got all data from values.TEST1[0],values.TEST1[1],values.TEST1[2],values.TEST7[0],values.TEST7[1],values.TEST7[2] this data passing to
io.on('connection',function(socket){
console.log('one user connected '+socket.id);
socket.emit("channelname", {
message: "Passing S71200 data"
});
socket.on('disconnect',function(){
console.log('one user disconnected '+socket.id);
});
})
Help me to solve this problem