Socket not emit messages

I’ve had a problem with receiving message from client to server with using React and ExpressJS. After launch sendMessage function on client side I want to send to server my message, but, I don’t know why this message is not being received by my server and io.on("message", (message) => { is not launched with his console.log :/

Here is my code

Server side:
index.ts

const server = http.createServer(app);
export const socketIo = socket(server);

socket.ts

export const socket = (httpServer: any) => {
    const io = new Server(httpServer, { cors: { origin: "http://localhost:5000" } });

    io.on("connection", (socket) => {
        console.log("Socket connected!")
        socket.emit('connection', null);
    });

    io.on("message", (message) => {
        console.log("NEW MESSAGE: ", message)
    })
}

Client side:
App.tsx

const SOCKET_SERVER = "http://127.0.0.1:3000";

export const socket = socketClient(SOCKET_SERVER);
socket.on('connect', () => {
  console.log('CONNECTED WITH BACKEND SOCKET')
})

Chat.tsx

  const sendMessage = () => {
    const message = form.getFieldsValue()["typedMessage"];

    socket.emit("message", message);
    
    form.resetFields();
  };

thanks for any help!

>Solution :

io.on("connection", (socket) => {
    console.log("Socket connected!")
    socket.emit('connection', null);
});

io.on("message", (message) => {
    console.log("NEW MESSAGE: ", message)
})

The "connection" is triggered on the server listener and provides a connected socket. The socket is then used to receive messages. This means receiving messages must be done on socket, not on the listener io:

io.on("connection", (socket) => {
    console.log("Socket connected!")
    socket.emit('connection', null);

    socket.on("message", (message) => {
        console.log("NEW MESSAGE: ", message)
    });
});