Problems and doubts with sockets and timeouts


 
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Old 02-09-2016
Problems and doubts with sockets and timeouts

Hi! I need some help to understand a little bit more the behaviour about socket and TCP connections...
Here is my problem I have a client and a server that were written in python. The server program wait
until a message arrive and then print the message but if the message not arrive in a second (a timeout of a second)
the connection is reset. In the other side the client sends a message in a random time and a "Still alive" message in about 0.4 seconds to the server.

For unexplained reasons randomly a timeout happen in the server Smilie although that I send the message just in time ,
I don't understand why this happen. I tried deactivate the Nagle's algorithm but the only change that I saw was the
time in appear another time out (in fact more larger) . I thought that if I can't avoid that problem about time outs
I must send the message again if the message was not received, but this produce me a few questions

Where are the messages that were lost in time out?
Can I have repeated messages after the time out? I mean If the timeout occurs, the message I sent can arrive later?
Why timeouts occur if I send correctly and timely message?

Thanks!
 
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socket.h(3)                                                  Library Functions Manual                                                  socket.h(3)

NAME
socket.h - Network addresses and sockets related classes. SYNOPSIS
#include <cc++/address.h> Classes class ost::Socket The Socket is used as the base for all Internet protocol services under Common C++. class ost::DCCPSocket DCCP sockets are used for stream based connected sessions between two sockets. class ost::UDPSocket UDP sockets implement the TCP SOCK_DGRAM UDP protocol. class ost::UDPBroadcast Representing a UDP socket used for subnet broadcasts, this class provides an alternate binding and setPeer() capability for UDP sockets. class ost::UDPTransmit Representing half of a two-way UDP connection, the UDP transmitter can broadcast data to another selected peer host or to an entire subnet. class ost::UDPReceive Representing half of a two-way UDP connection, the UDP receiver can receive data from another peer host or subnet. class ost::UDPDuplex UDP duplex connections impliment a bi-directional point-to-point UDP session between two peer hosts. class ost::TCPSocket TCP sockets are used for stream based connected sessions between two sockets. class ost::TCPV6Socket TCPV6 sockets are used for stream based connected sessions between two ipv6 sockets. class ost::TCPStream TCP streams are used to represent TCP client connections to a server by TCP protocol servers for accepting client connections. class ost::TCPSession The TCP session is used to primarily to represent a client connection that can be managed on a separate thread. class ost::SimpleTCPStream Simple TCP Stream, to be used with Common C++ Library. Namespaces namespace ost Macros #define INVALID_SOCKET -1 #define _IOLEN64 #define _IORET64 #define MSG_DONTWAIT 0 #define MSG_NOSIGNAL 0 #define SOCK_DCCP 6 #define IPPROTO_DCCP 33 #define SOL_DCCP 269 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12 #define DCCP_SOCKOPT_CCID 13 #define DCCP_SOCKOPT_TX_CCID 14 #define DCCP_SOCKOPT_RX_CCID 15 Typedefs typedef int SOCKET Variables class __EXPORT ost::SimpleTCPStream Detailed Description Network addresses and sockets related classes. Macro Definition Documentation #define _IOLEN64 Referenced by ost::SocketPort::peek(), ost::UDPSocket::peek(), ost::TCPStream::peek(), ost::SocketPort::receive(), ost::UDPReceive::receive(), ost::SocketPort::send(), ost::UDPTransmit::send(), and ost::UDPTransmit::transmit(). #define _IORET64 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12 #define DCCP_SOCKOPT_CCID 13 #define DCCP_SOCKOPT_RX_CCID 15 #define DCCP_SOCKOPT_TX_CCID 14 #define INVALID_SOCKET -1 #define IPPROTO_DCCP 33 #define MSG_DONTWAIT 0 Referenced by ost::UDPTransmit::transmit(). #define MSG_NOSIGNAL 0 Referenced by ost::UDPTransmit::send(), and ost::UDPTransmit::transmit(). #define SOCK_DCCP 6 #define SOL_DCCP 269 Typedef Documentation typedef int SOCKET Author Generated automatically by Doxygen for GNU CommonC++ from the source code. GNU CommonC++ Sat Jun 23 2012 socket.h(3)