Why the module C does not receive the socket io "hi" event? - node.js

Question

How to call different module for different socket path?
Here is server code:
require('dotenv-flow').config();
const express = require('express');
const app = express();
const http =require('http');
const httpServer= http.createServer(app);
const io = require('socket.io')(httpServer);
let C=require('./C');
let c=new C(io.of("/c"));
class C {
constructor(socket) {
socket.on("connection",()=>{
console.log("Connection to /c");
});
socket.on("hi", (peerName, calllBack) => {
console.log("Received say hi from " + peerName + ".");
});
}
}
module.exports = C;
The client side code:
import { useEffect} from "react";
import io from "socket.io-client";
export default function TestSocket() {
useEffect(() => {
let peerName;
let signalServerURL=process.env.REACT_APP_SOCKET_URL + "c";
let sUsrAg = navigator.userAgent;
if (sUsrAg.indexOf("Edg") > -1) {
peerName = "Edge";
} else {
if (sUsrAg.indexOf("Chrome") > -1) {
peerName = "Chrome";
} else {
if (sUsrAg.indexOf("Firefox") > -1) {
peerName = "Firefox";
} else {
if (sUsrAg.indexOf("Safari") > -1) {
peerName = "Safari";
}
}
}
}
let socket = io(signalServerURL, {
transports: ["websocket"],
});
socket.emit("hi", peerName, (response) => {
console.log(response);
});
},[]);
return (
<></>
)
}
The module C can receive "connection" event, however, it cannot receive the "hi" event, why?
Besides that, I want to use different module/class to handle different socket path.
e.g.
for the path /b socket access, I want to use the module B to handle it.
for the path /d socket access, I want to use the module D to handle it.
How can I implement it?
According to the Philippe answer, I modified the server code as below:
require('dotenv-flow').config();
const express = require('express');
const app = express();
const http =require('http');
const httpServer= http.createServer(app);
const io = require('socket.io')(httpServer);
let C=require('./C');
let c=new C(io,"/c");
class C {
constructor(io,path) {
io.of(path).on("connection",socket=>{
console.log("Connection to "+path);
socket.on("hi", (peerName, calllBack) => {
console.log("Received say hi from " + peerName + ".");
});
});
}
}
module.exports = C;
It works!

Answer 1

When a connection is successful, socket-io returns the socket you need to use. You can try something like:
constructor(io) {
io.on("connection", (socket) => {
console.log("Connection to /c " + socket.id);
socket.on("hi", (peerName, calllBack) => {
console.log("Received say hi from " + peerName + ".");
});
});
}