IP Messenger如何填充在线用户

Question

I am developing IP messenger(LAN messenger) for android,

Successfully able to send data using udp. But I have to manually type the target IP address.

Now I am trying to create a list of online users.

How do IP messenger populates online users?

Answer 1

One solution is to :

Make Clients Ping the Server in frequent intervals

At the server side , update the list of users based on the ping received from client