没有客户端脚本的Socket.IO ping

Question

I have an Android application and when somebody forces it to stop it doesn't fire the disconnect event on the server side.

Since I can't force people to update their android app, I can't make a ping event handler on the client side. How could I check on the server side whether the client is active without client-side modification?

Answer 1

You need to find out why the disconnect event doesn't fire.
Have you put the socket's disconnect event inside the connection callback?
Also pay attention to variable io and socket . Maybe you put it wrong.

io.on('connection', function (socket) {
  console.log('user connected');

  socket.on('disconnect', function () {
    console.log('user disconnected');
  });
});

If the structure is already right, then I believe you should check the client's code.