Receive query                                                                                                                                                                       
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                        Reply                                                                                                    
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                            false
                                                                    ok to connect?                                                                                                                               
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                      true                                                                       
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                 Connect                                                                                                                         
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                                                 
                                                                                                                                                                                               no                
                                                                                 connected?                                                                                                                      
                                                                                                                                                                                                                 
                                                                                                                                      yes