send() hangs

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ronaldyorts
Posts: 1
Joined: Sun Apr 23, 2017 4:09 pm

send() hangs

Post by ronaldyorts » Sun Apr 23, 2017 4:32 pm

I want to send a string to my nodejs TCP server.

This is the code for my client (C++):

Code: Select all

#include <nds.h>
#include <dswifi9.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string>

std::string hostname = "hostname";
int port = 61733;
int sock;

int main(){
    Connect(); //function to connect with a WiFi network
    ConnectToServer();

    unsigned long lastSendTime = 0;
    unsigned long sendInterval = 200; //send a message every 200 milliseconds
    unsigned int nMsgSent = 0;

    while (1){
        unsigned long now = milliseconds(); //function to get the time in milliseconds
        if ((now - lastSendTime) > sendInterval){
            std::string request = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
            request += request;
            request += std::to_string(nMsgSent);
            request += "\n";

            int sendResult = ::send(sock, request.c_str(), request.length(), 0);
            iprintf("req(%d): %d\n", nMsgSent, sendResult);

            nMsgSent++;
            lastSendTime = now;
        }
    }
    return 0;
}
The client only sends about 180 messages and then send hangs. The server only receives ~120 messages.
When I increase the length of the request, the client sends less requests and when I decrease the length, the clients sends more requests.
I also found out that when I decrease the sendInterval, I can send more requests before send hangs.
I don't know what I'm doing wrong. When I execute similar code with a nodejs client, everything is okay, so the problem lies with the C++ client.

I also asked this question on Stack Overflow(http://stackoverflow.com/q/43501964/7353781), but nobody could help me so far :( .
The server code and some other things are mentioned in my question on Stack Overflow.
It would be great if somebody could help me with this.

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