On Thursday, November 8, 2012 6:23:13 PM UTC-5, Jorgen Grahn wrote:   
   > On Thu, 2012-11-08, Rick Jones wrote:   
   >    
   > > Mark Hounschell wrote:   
   >    
   > ...   
   >    
   > >> Performance is not as critical as emulation accuracy.   
   >    
   > >   
   >    
   > > I do not really want to open another can of worms for you, but   
   >    
   > > depending on the nature of that which you are looking to emulate, you   
   >    
   > > should probably also know that strictly speaking, TCP is not a   
   >    
   > > "reliable transport" in that it does not guarantee delivery.   
   >    
   >    
   >    
   > To open a third can of worms: are we sure he means to use TCP?  He   
   >    
   > mentioned it once (as "Ethernet/TCP"), but from the rest of his   
   >    
   > postings he seem to think mostly in terms of Ethernet and a little   
   >    
   > about IP (he touched on the subject of IP fragmentation).   
   >    
      
   Fortunately, the device on the other end of the cable of this legacy   
   controller, which I am also emulating, knows exactly how much data is to be   
   received from the controller and obviously how much data is being requested by   
   the controller. I have in    
   place already a software ACK sequence.   
      
   But, now I feel sort of stupid as far as TCP/IP is concerned, I am doing this   
   in a server/client mode. The device is the server and the controller is the   
   client. The server "listens" for the clients "connection" then after a   
   connection is established,    
   the server waits for requests from the client and services them after   
   received. That's all done using send/recv. Here's the stupid part. Am I using   
   TCP or IP? I assumed TCP. And I assumed it was "reliable". The sockets are   
   opened:    
      
   socket(AF_INET, SOCK_STREAM, 0);   
   setsockopt(H->sockfd, IPPROTO_TCP, TCP_NODELAY, (char *) &tcpnodelay_flag,   
   sizeof(int))   
   setsockopt(H->sockfd, SOL_SOCKET, SO_KEEPALIVE, (char *) &keepalive_flag,   
   sizeof(int))   
   setsockopt(H->sockfd, SOL_SOCKET,  SO_REUSEADDR, (char *) &reuseaddr_flag,   
   sizeof(int))   
      
   Then the server is bound and listens until the client connects. Forgive my   
   ignorance. This is my first Ethernet project not using UDP.   
      
   Mark   
      
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