Using sockets

At a somewhat lower level in the OSI model than HTTP clients and servers, we find sockets. They also enable interprocess communications across a network between clients and servers and are implemented on top of the TCP/IP. The classes that offer that functionality can be again found in dart:io as follows:

• Socket: This is used by a client to establish a connection to a server

• ServerSocket: This is used by a server to accept client connections

How to do it...

The following steps will show you how to make a server socket work:

1. The following is the code for the server (see the project sockets, socket_server.dart):

   import 'dart:io';
   import 'dart:convert';
   
   InternetAddress HOST = InternetAddress.LOOPBACK_IP_V6;
   const PORT = 7654;
   
   void main() {
     ServerSocket.bind(HOST, PORT)
     .then((ServerSocket srv) {
       print('serversocket is ready');
       srv.listen(handleClient);
       })
              .catchError(print);
     );
   }
   
   void handleClient(Socket client){
     print('Connection from: '
     '${client...