     {
       int rc=0;
       int iretry=0;
     
       while (iretry<client_connect_num_retry && rc==0)
       {
         if (iretry) 
         {
           std::this_thread::sleep_for (std::chrono::milliseconds(client_connect_retry_timeout));
         }
         rc=ConnectTo(server,port);
         iretry++;
       }
       if (!rc) return rc;
     
     
       rc=Handshake();
       if (!rc) throw std::runtime_error("Client handshake failed");
       return rc;
     }