Why socket.io can't receive emited events from my Flutter app?

[bestofman]

This is the simple socket.io NodeJS server I am trying to run:

io.on("connection", (socket) => {
  console.log("connetetd");
  console.log(socket.id, "has joined");
  socket.on("signin", (id) => {
    console.log('this is id',id);
    clients[id] = socket;
    console.log(clients);
  });
  socket.on("message", (msg) => {
    
    console.log('this is the message ',msg);
    let targetId = msg.targetId;
    if (clients[targetId]) clients[targetId].emit("message", msg);
  });
});

And this is the code from my Flutter app:

  void connect() {
    socket = IO.io("http://10.0.2.2:5000", <String, dynamic>{
      "transports": ["websocket"],
      "autoConnect": false,
    });
    socket!.connect();

    socket!.onConnect((data) {
      socket!.emit("signin", widget.sourchat!.id);
    });

    socket!.on("message", (msg) {
      print('message $msg');
      setMessage("destination", msg["message"]);
      _scrollController.animateTo(_scrollController.position.maxScrollExtent,
          duration: Duration(milliseconds: 300), curve: Curves.easeOut);
    });
  }

Then I use the following button to send the messages:

  child: CircleAvatar(
    child: IconButton(
      icon: Icon(
        sendButton ? Icons.send : Icons.mic,
        color: Colors.white,
      ),
      onPressed: () {
        if (sendButton) {
          _scrollController.animateTo(
              _scrollController
                  .position.maxScrollExtent,
              duration:
                  Duration(milliseconds: 300),
              curve: Curves.easeOut);
          sendMessage(
              _controller.text,
              widget.sourchat!.id!,
              widget.chatModel!.id!);
          _controller.clear();
          setState(() {
            sendButton = false;
          });
        }
      },
    ),
  ),  

What I see from console logs in backend application is something like:

connetetd
qftDanMOpdaTndMgAAAe has joined
connetetd
ZnQ1zyAbjhH9ldQuAAAf has joined

But in the front end side I can not see any result for print('message $msg'); and maybe bacause of that I can not also see any results in backend side as well. Why this happens and how can I fix that?