500 Internal error

Reach Module / M+ / M2 Getting started
1

I wrote a javascript using socket.io to connect to Reach. Please see the code below

// SocketIO namespace:
namespace = "/test";

// initiate SocketIO connection
socket = io.connect("http://192.168.42.1" + namespace);

// say hello on connect
socket.on("connect", function () {
    socket.emit("browser connected", {data: "I'm connected"});
    $( "#popupDisconnected" ).popup( "close");
});

socket.on('disconnect', function(){
    console.log('disconnected');
    $( "#popupDisconnected" ).popup( "open");
});

When setting up the socket connection, it always returns 500 Internal Server Error.
GET http://192.168.42.1/socket.io/?EIO=3&transport=polling&t=LVkvHdx 500 (Internal Server Error)

When accessing 192.168.42.1 directly, there is no such an error.

Could you please help?

2

This only happens when the emlid reach rtk is rover mode. Everything seems fine when it is base mode. Any idea?