code: def s_connect(self, server, port, r_server=None):
          
          with self.lock:
              if not r_server:
                  self.send('CONNECT %s %s' % (server, port), error_check=True)
              else:
                  self.send('CONNECT %s %s %s' % (server, port, \
                                      r_server), error_check=True)
docs: Link a server.
          Required arguments:
          * server - Server to link with.
          * port - Port to use.
          Optional arguments:
          * r_server=None - Link r_server with server.